One mole any of which substance contains a total of 6.023 X 10²³ atoms by atoms/molecule.
6.02 X 10²³ units of any given substance make up one mole of that material. The fact that one mole of a material has a mass in grammes that is exactly equal to the substance's formula weight is also significant. As a result, one mole of an element contains 6.02 X 10²³ of the element's atoms and has a mass in grammes equal to the element's atomic weight.
Make sure to be clear about what you're referring to while discussing the diatomic gases, sulphur, and phosphorus, which do not exist as single atoms.
1 mole of substance contains 6.023 X 10²³ molecules.
Volume of solution = 100 mL = 0.1 L
Molarity of solution = 0.02 M
Molarity = number of moles of solute/ Volume of solution (in L)
no. of moles of solute = molarity × volume
=0.02 mol L−1×0.1 L
= 0.002 mol.
Thus, 12.044 x 10²⁰ molecules of H2SO4 are present in 100mL of 0.02 M H2SO4 solution.
Learn more about Mole:
https://brainly.com/question/20432652
#SPJ4
Complete question;
One mole of any substance contains 6.022 × 1023 atoms/molecules. Number of molecules of H2SO4 present in 100 mL of 0.02M H2SO4 solution is.
true or false: as the nu,ber of attached oxgen atoms increases, the oxidation number of the central atom decreases.
The given statement "As the number of attached oxygen atoms increases, the oxidation number of the central atom decreases" is A. true because When a central atom is attached to more oxygen atoms, its oxidation state decreases. According to the rules of oxidation states, oxygen always has an oxidation state of -2 in almost all its compounds.
Therefore, if we know the oxidation state of oxygen in a compound, we can easily find the oxidation state of the central atom. In compounds that have a central atom and multiple oxygen atoms attached to it, the oxidation state of the central atom is equal to the sum of the oxidation states of all the attached oxygen atoms. For instance, in sulfuric acid (H2SO4), the oxidation state of sulfur is +6, while the oxidation state of each oxygen atom is -2. So, if we have more than one oxygen atom, the sum of their oxidation numbers will be greater than -2, which in turn causes the oxidation state of the central atom to decrease as compared to its original value. Therefore, the statement As the number of attached oxygen atoms increases, the oxidation number of the central atom decreases Therefore the correct option is A.
The complete question is :
As the number of attached oxygen atoms increases, the oxidation number of the central atom decreases.
a True
b False
Know more about oxidation state here:
https://brainly.com/question/25551544
#SPJ11
you decide to run a different trial of the reaction with a ki solution of 0.74 m. calculate the molarity of the ki in a vessel that contains 1.75 ml of the ki solution, 1.24 ml of water, and 3.96 ml of the hydrogen peroxide solution.
The molarity of the KI is 0.187M.
To calculate the molarity of the KI solution in the given vessel, we need to first find out how much KI is present in the vessel. To do this, we can use the equation:
Moles of KI = (Volume of KI solution x Molarity of KI solution) ÷ 1000
In this case, the volume of the KI solution is 1.75 mL, and the molarity of the KI solution is 0.74M. Therefore, the moles of KI in the vessel can be calculated as:
Moles of KI = (1.75 mL x 0.74M) ÷ 1000 = 0.0013 mol
Next, we can calculate the molarity of the KI solution in the vessel. To do this, we can use the equation:
Molarity of KI solution = (Moles of KI x 1000) ÷ (Volume of KI solution + Volume of Water + Volume of Hydrogen Peroxide Solution)
In this case, the moles of KI is 0.0013 mol, the volume of KI solution is 1.75 mL, the volume of water is 1.24 mL, and the volume of hydrogen peroxide solution is 3.96 mL.
Therefore, the molarity of the KI solution in the vessel can be calculated as:
Molarity of KI solution = (0.0013 mol x 1000) ÷ (1.75 mL + 1.24 mL + 3.96 mL) = 0.187M
Therefore, the molarity of the KI solution in the vessel that contains 1.75 ml of the KI solution, 1.24 ml of water, and 3.96 ml of the hydrogen peroxide solution is 0.187M.
To know more about molarity, refer here:
https://brainly.com/question/2817451#
#SPJ11
35.0 ml of 0.255 m nitric acid is added to 45.0 ml of 0.328 m mg(no3)2. what is the concentration of nitrate ion in the final solution?
The concentration of nitrate ion in the final solution when 35.0 ml of 0.255 m nitric acid is added to 45.0 ml of 0.328 m Mg(NO₃)₂ is 0.48 M.
The concentration of HNO₃ and Mg(NO₃)₂ are 0.255M and 0.328M respectively.
The volume of HNO₃ is 35ml.
Volume of Mg(NO₃)₂ is 45ml.
We are supposed to find out the concentration of nitrate ions in the final solution.
Step 1: Calculation of the number of moles of HNO₃ used:
Molarity of HNO₃ = 0.255M
Moles of HNO₃ used = Volume of HNO₃ × Molarity of HNO₃
Moles of HNO₃ used = 35ml × 0.255MMoles of HNO₃ used = 0.00893moles.
Step 2: Calculation of the number of moles of Mg(NO₃)₂ used:
Molarity of Mg(NO₃)₂ = 0.328M
Moles of Mg(NO₃)₂ used = Volume of Mg(NO₃)₂ × Molarity of Mg(NO₃)₂
Moles of Mg(NO₃)₂ used = 45ml × 0.328M
Moles of Mg(NO₃)₂ used = 0.01476moles.
Moles of (NO₃) = 2 x Moles of Mg(NO₃)₂ used = 0.02952
Step 3: Calculation of concentration of nitrate ion in the final solution.
The number of moles of nitrate ion in the solution= 0.02952 + 0.00893 = 0.03845
The concentration of nitrate ion in the solution = (Moles of nitrate ion in the solution)/ (Total Volume of Solution)
The concentration of nitrate ions in the solution = 0.03845mol/(80.0/1000)L= 0.48M in nitrate ions.
Therefore, the concentration of nitrate ions in the final solution is 0.48M.
To know more about concentration, refer here:
https://brainly.com/question/30820773#
#SPJ11
the partial pressure of oxygen at the surface where the total pressure is 1.00 atm is 0.21 atm . for compressed air, calculate the partial pressure of oxygen at a depth of 80 m , where the total pressure is 9.0 atm .
The partial pressure of oxygen at a depth of 80 m, where the total pressure is 9.0 atm, is 1012.36 Pa or 0.009 atm (approx).
Given that the partial pressure of oxygen at the surface where the total pressure is 1.00 atm is 0.21 atm, we can use the following formula to calculate the partial pressure of oxygen at a depth of 80 m:
P2 = P1 + (d × ρ × g) where,P1 = 1 atm, P2 = 9 atm (total pressure at 80 m depth), ρ = density of air = 1.29 kg/m3 (at standard temperature and pressure), g = acceleration due to gravity = 9.8 m/s2, d = depth = 80 m
Now, substituting the given values in the above formula:
P2 = P1 + (d × ρ × g)
P2 = 1 + (80 × 1.29 × 9.8)
P2 = 1 + 1011.36
P2= 1012.36 Pa
Thus, the partial pressure of oxygen at a depth of 80 m, where the total pressure is 9.0 atm, is 1012.36 Pa or 0.009 atm (approx).
For more such questions on pressure, click on:
https://brainly.com/question/24719118
#SPJ11
during glycolysis and the citric acid cylce are passed from organic molecules to a molecule of that results in the formation of
During glycolysis and the citric acid cycle, electrons are passed from organic molecules to a molecule of NAD⁺ and FAD⁺ that results in the formation of ATP.
ATP (Adenosine triphosphate) is an organic molecule that is considered a main source of energy for many metabolic processes and is synthesized during cellular respiration by breaking down organic molecules.ATP synthase plays a significant role in the production of ATP.
ATP synthase is an enzyme located on the inner membrane of the mitochondria that helps to make ATP. It produces ATP by using the energy stored in a proton gradient formed by the electron transport chain. The energy released by this gradient drives the conversion of ADP (adenosine diphosphate) to ATP.
In glycolysis, glucose is converted into pyruvate by a series of chemical reactions. This process involves the use of ATP, which is synthesized from ADP and inorganic phosphate. During the conversion of glucose into pyruvate, electrons are passed from organic molecules to NAD+ (nicotinamide adenine dinucleotide) to form NADH. NADH then delivers these electrons to the electron transport chain, which ultimately leads to the production of ATP.
In the citric acid cycle, pyruvate is converted into acetyl-CoA, which then enters the citric acid cycle. During this cycle, electrons are passed from organic molecules to NAD+ and FAD (flavin adenine dinucleotide) to form NADH and FADH₂. These molecules then deliver these electrons to the electron transport chain, which ultimately leads to the production of ATP.
Overall, the transfer of electrons from organic molecules to molecules such as NAD+ and FAD in glycolysis and the citric acid cycle ultimately leads to the formation of ATP.
To know more about NAD⁺, refer here:
https://brainly.com/question/4221953#
#SPJ11
Can someone help me with this? Only need someone to show me how to get the concentration of the first one or two? The wavelength is 530nm. Thanks!
In air, green light has a wavelength of 530 nm and impacted on emerald with a coefficient of refraction of 1.59.
What is a wavelength example?The duration of a periodic wave is the distance over which the wave's form repeats in physics. It is the distance between two successive matching places of the same phase on the wave, such as two neighbouring crests, troughs, or zero crossings, and it is a feature of both moving and standing waves, as well as other spatial wave patterns.
The spatial frequency is the opposite of the spectrum. The Greek symbol lambda () is frequently used to represent wavelength. In the case of a sinusoidal wave travelling at a constant speed, wavelength is inversely proportionate to frequency: waves with higher frequencies have shorter wavelengths, and waves with lower frequencies have longer wavelengths.
Learn more about wavelength
https://brainly.com/question/13533093
#SPJ1
PLEASE HELP AND FAST
Heredity Lab Report
Instructions: In the Heredity lab, you investigated how hamsters inherit traits from their parents. Record your observations in the lab report below. You will submit your completed report.
Name and Title:
Include your name, instructor's name, date, and name of lab.
Objective(s):
In your own words, what was the purpose of this lab?
Hypothesis:
In this section, please include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.
Test One: If I breed a short fur, FF female with a short fur, Ff male, then I will expect to see (all short fur; some short and some long fur; all long fur) offspring.
Test Two: If I breed a short fur, Ff female with a short fur, Ff male, then I will expect to see (all short fur; some short and some long fur; all long fur) offspring.
Test Three: If I breed a long fur, ff female with a long fur, ff male, then I will expect to see (all short fur; some short and some long fur; all long fur) offspring.
Procedure:
The procedures are listed in your virtual lab. You do not need to repeat them here. Please be sure to identify the test variable (independent variable) and the outcome variable (dependent variable) for this investigation.
Remember, the test variable is what is changing in this investigation. The outcome variable is what you are measuring in this investigation.
Test variable (independent variable):
Outcome variable (dependent variable):
Data:
Record the data from each trial in the data chart below. Be sure to fill in the chart completely.
Test One
Parent 1: FF
Parent 2: Ff
Phenotype ratio:
________ :
________
short fur :
long fur
Test Two
Parent 1: Ff
Parent 2: Ff
Phenotype ratio:
________ :
________
short fur :
long fur
Test Three
Parent 1: ff
Parent 2: ff
Phenotype ratio:
________ :
________
short fur :
long fur
Conclusion:
Your conclusion will include a summary of the lab results and an interpretation of the results. Please write in complete sentences.
Which genotype(s) and phenotype for fur length are dominant?
Which genotype(s) and phenotype for fur length are recessive?
If you have a hamster with short fur, what possible genotypes could the hamster have?
If you have a hamster with long fur, what possible genotypes could the hamster have?
Did your data support your hypotheses? Use evidence to support your answer for each test.
Test One:
Test Two:
Test Three:
Which hamsters are the parents of the mystery hamster? Include evidence to prove that they are the correct parents.
The parents of the mystery hamster are most likely Test Two parents (Ff x Ff), as they have the possibility of producing both short fur and long fur offspring, which matches the observed phenotype of the mystery hamster.
What is Genotype?
The genotype of an organism can be represented using letters to denote the alleles inherited from each parent. For example, in humans, the gene for eye color has two alleles: brown (B) and blue (b). A person with brown eyes would have a BB or Bb genotype, while a person with blue eyes would have a bb genotype.
Test variable (independent variable): Genotype of parents
Outcome variable (dependent variable): Phenotype of offspring (fur length)
Data:
Test One
Parent 1: FF
Parent 2: Ff
Phenotype ratio:
3 : 0
short fur : long fur
Test Two
Parent 1: Ff
Parent 2: Ff
Phenotype ratio:
3 : 1
short fur : long fur
Test Three
Parent 1: ff
Parent 2: ff
Phenotype ratio:
0 : 4
short fur : long fur
From the lab results, we can conclude that the genotype for short fur length is dominant over the genotype for long fur length. The genotype for long fur length is recessive.
If you have a hamster with short fur, the possible genotypes could be FF or Ff.
If you have a hamster with long fur, the genotype could only be ff.
The data supports the hypothesis that the genotype for short fur is dominant and the genotype for long fur is recessive.
Learn more about Genotype from the given link
https://brainly.com/question/22117
#SPJ1
a solution contains 25.0 grams of caffeine, c8h10n4)2, in a total soltuion volume of .450 l. what is the concentration of caffeine in the solution
The concentration of caffeine in the solution is 55.55 mm. To calculate this, we need to use the formula for molarity: molarity = (moles of solute) / (liters of solution). In this case, we have 25.0 grams of caffeine (C8H10N4O2), which is equal to 0.015 moles (using the molar mass of caffeine). We also have a total solution volume of 0.450 liters. Plugging this into the equation above gives us molarity = (0.015 moles of solute) / (0.450 liters of solution), which simplifies to 55.55 mm.
In terms of explanation, molarity is a unit of concentration that measures the number of moles of a given solute present in one liter of solution. The equation for molarity is simple and straightforward: molarity = (moles of solute) / (liters of solution). In order to calculate the molarity of the given solution, we first need to calculate the number of moles of caffeine in the solution, which is done by multiplying the mass of caffeine (25.0 grams) by the molar mass of caffeine (194.19 g/mol).
Then, we plug this number and the volume of the solution (0.450 liters) into the molarity equation to get the concentration of caffeine in the solution.
Overall, the concentration of caffeine in the solution is 55.55 mm.
To know more about caffeine refer here:
https://brainly.com/question/9255669#
#SPJ11
fill in the blank. the___is the organelle that is formed when an endosome, containing hydrolytic enzymes necessary for the digestion of the materials, reaches a low ph of approximately 4.5.
The lysosome is the organelle that is formed when an endosome, containing hydrolytic enzymes necessary for the digestion of the materials, reaches a low pH of approximately 4.5.
Lysosomes are sac-like vesicles with single membranes that enclose hydrolytic enzymes that can break down biomolecules. Lysosomal enzymes work best in acidic environments and thus the pH of the lysosome is around 4.5, which is slightly acidic. The formation of lysosomes begins with the formation of endosomes.
Endosomes form through the process of endocytosis. In endocytosis, the cell membrane invaginates and surrounds a portion of the extracellular fluid, thereby forming a small vesicle, called a primary endosome. Primary endosomes mature into late endosomes by fusing with other primary endosomes or with other vesicles.
Late endosomes then mature into lysosomes by undergoing changes in the structure of their membranes that facilitate the mixing of hydrolytic enzymes with the material to be digested. In summary, lysosomes are organelles that contain hydrolytic enzymes that can break down biomolecules.
They form when endosomes reach a low pH of approximately 4.5. The formation of lysosomes begins with the formation of endosomes that mature into late endosomes and then into lysosomes. The pH of lysosomes is acidic, around 4.5.
To know more about lysosome, refer here:
https://brainly.com/question/14033260#
#SPJ11
which of the following statements about activation energy is correct? group of answer choices it is the same for all reactions. no correct response. it is low for reactions that take place rapidly. it is the maximum energy a reacting molecule may possess.
The statement that is correct about activation energy is that it is low for reactions that take place rapidly.
Activation energy refers to the least amount of energy needed for a reaction to take place. It is the amount of energy required to form an activated complex that breaks the bonds of reactants to form products.The significance of activation energy is that it provides information about the speed of chemical reactions. Reactions with high activation energy are slow, whereas those with low activation energy are rapid. The activation energy also determines the effectiveness of catalysts, which are substances that lower the activation energy of a reaction, allowing it to proceed more rapidly.
The Arrhenius equation is a mathematical equation that shows the dependence of reaction rate on temperature. The equation is expressed as:
[tex]k=Ae^{{\frac {-E_{a}}{RT}}}[/tex]
Where: k is the rate constant of the reaction, A is the frequency factor (a constant that depends on the reaction), Ea is the activation energy of the reaction, R is the gas constant, T is the temperature.
For more such questions on activation energy , Visit:
https://brainly.com/question/26724488
#SPJ11
the empirical formula of a chemical substance is ch2. the molar mass of a molecule of the substance is 56.108 g/mol. what is the molecular formula of the chemical substance? (4 points) c3h4 c4h8 c2h4 c6h6
The molecular formula of the chemical substance is C4H8.
The empirical formula of a chemical substance, CH2, and its molar mass of 56.108 g/mol can be used to calculate the molecular formula of the substance.
In order to do this, we need to divide the molar mass by the empirical formula mass. The empirical formula mass for CH2 is 12.011 g/mol, so the calculation is: 56.108 g/mol / 12.011 g/mol = 4.67.
4.67, is the ratio of the molecular mass to the empirical formula mass.
This means that the molecular formula of the chemical substance is C4H8, which has a molecular mass of 4 x 12.011 g/mol = 48.044 g/mol, and is the closest molecular mass to the given molar mass of 56.108 g/mol.
Therefore, the molecular formula of the chemical substance is C4H8.
to know more about molecular formula refer here:
https://brainly.com/question/14425592#
#SPJ11
How many oxygen atoms are there in 2 molecules of CH3ClO?
One molecule of this substance has the molecular formula CH₂ClO, which is methoxychloro. to ascertain how many oxygen atoms there are in 2 molecules of methoxychloro.
What do two oxygen atoms in a molecule represent?
To create dioxygen, or oxygen, two oxygen atoms must make a covalent double bond with one another. Typically, oxygen exists as a molecule. It has the name dioxygen.
With an electrical configuration of (2, 6) and an atomic number of 8, oxygen lacks two more electrons to complete an octet. By exchanging two pairs of electrons with another oxygen atom, the oxygen atom becomes stable. A diatomic oxygen molecule is one that contains two oxygen atoms.
To know more about oxygen atoms visit:-
brainly.com/question/14387251
#SPJ1
what is the concentration of thiocyanate in beaker 6? group of answer choices 2e-5 m 4e-5 m 8e-5 m 1.2e-4 m 1.6e-4 m 2e-4 m
The concentration of thiocyanate in beaker 6 is 2e-4 m. This is the highest concentration of the given options.
Thiocyanate is an anion composed of a sulfur atom and a nitrogen atom, which has a negative charge. It is usually found in aqueous solutions and is used as a ligand in complexes with transition metals. In beaker 6, the concentration of thiocyanate is 2e-4 m, which is the highest concentration of the given options.
The other concentrations given are 2e-5 m, 4e-5 m, 8e-5 m, 1.2e-4 m, and 1.6e-4 m. This means that the thiocyanate concentration in beaker 6 is 10 times higher than the concentration in beaker 5, 20 times higher than the concentration in beaker 4, 40 times higher than the concentration in beaker 3, 80 times higher than the concentration in beaker 2, and 160 times higher than the concentration in beaker 1.
The higher the concentration of thiocyanate, the stronger the interaction with transition metals. This means that the reaction in beaker 6 will be faster than the reactions in the other beakers. Therefore, the concentration of thiocyanate in beaker 6 is the highest of the given options.
To know more about thiocyanate click on below link :
https://brainly.com/question/29072122#
#SPJ11
what is the total number of chain bonds in an average molecule calculate repeat unit molecular weight
The total number of chain bonds in an average molecule is 4.
To calculate the repeat unit molecular weight, you need to add the atomic weights of all the atoms in the molecule and multiply the sum by the number of repeat units in the molecule.
How to calculate the repeat unit molecular weight?
Step 1: Determine the molecular formula of the polymer unit.
Step 2: Find the atomic weights of all the atoms present in the repeat unit.
Step 3: Add up the atomic weights of all the atoms in the molecule.
Step 4: Multiply the sum by the number of repeat units in the molecule.
Here's an example:
Polymer unit: CH2CHCl
Atomic weights: C = 12.01 g/mol, H = 1.008 g/mol, Cl = 35.45 g/mol
Molecular weight = (12.01 x 2) + 1.008 + 35.45
= 60.49 g/mol
Repeat unit = (CH2CHCl)n
Repeat unit molecular weight = 60.49 x n, where n is the number of repeat units in the molecule.
Learn more about molecular weight here:
https://brainly.com/question/27988184#
#SPJ11
Can someone help me?
1.2 n2 (2 mol nan3 / 3 Mon2) x (65.011g / 1 mol. nan3)= ?
The answer is approximately 52.01 g. Moles are important in chemistry because they allow chemists to convert between the mass, volume, and number of entities of a substance.
What is Mole?
In chemistry, mole is a unit used to measure the amount of a substance. One mole of a substance contains the same number of entities (such as atoms, molecules, or ions) as there are atoms in exactly 12 grams of carbon-12. This number is known as Avogadro's number, which is approximately 6.02 x 10^23 entities.
The given expression is:
1.2 N2 (2 mol NaN3 / 3 N2) x (65.011g / 1 mol. NaN3)
First, we can simplify the ratio of moles of NaN3 to moles of N2:
2 mol NaN3 / 3 mol N2
This can be simplified further by dividing both numbers by the greatest common factor, which is 1:
2/3 mol NaN3 / 1 mol N2
Now we can substitute this value into the expression:
1.2 N2 x (2/3 mol NaN3 / 1 mol N2) x (65.011g / 1 mol. NaN3)
Next, we can cancel out the units of mol N2 and mol NaN3, leaving us with:
1.2 x 2/3 x 65.011g
Multiplying these values together, we get:
52.00968 g
Therefore, the answer is approximately 52.01 g.
Learn more about Mole from given link
https://brainly.com/question/26150306
#SPJ1
a cholesterol sample is prepared using acetyl coa molecules in which both the methyl group and the carboxyl functional group of the acetyl are radiolabeled with 14c. in the cholesterol product, the 14c label would appear:
A cholesterol sample is prepared using acetyl CoA molecules in which both the methyl group and the carboxyl functional group of the acetyl are radiolabeled with 14c. In the cholesterol product, the 14C label would appear in the acetate component.
Cholesterol is a waxy substance that your liver produces and is found in animal-based foods. Cholesterol is crucial for the functioning of your body. It helps your body produce hormones, vitamin D, and bile acids, which aid in the digestion of fat. However, having too much of it in your blood raises your risk of heart disease and stroke. 14C is a radiolabeled carbon isotope. Isotopes are variants of the same element that have a different number of neutrons. Carbon-14 (14C) is an isotope of carbon that has 6 protons and 8 neutrons in its nucleus. In the cholesterol product, the 14C label would appear in the acetate component.
Learn more about cholesterol at https://brainly.com/question/841110
#SPJ11
what occurs when a solution of na2so4 containing several drops of phenolphthalein is electrolyzed between pt electrodes?
Hydrogen gas and oxygen gas are produced at the cathode and anode, respectively when a solution of Na₂SO4 containing several drops of phenolphthalein is electrolyzed between Pt electrodes.
When a solution of Na₂SO4 containing several drops of phenolphthalein is electrolyzed between Pt electrodes, the following reaction takes place:
2H₂O(l) + 2e- ⟶ H₂(g) + 2OH⁻(aq)
Na₂SO4 (solute) dissociates into ions, i.e., Na+ and SO₄²⁻ in the solution.
When the current is passed through this solution, the positively charged sodium ions migrate towards the negative electrode, i.e., the cathode, whereas the negatively charged sulfate ions migrate towards the positive electrode, i.e., the anode.
At the cathode, the hydrogen ion accepts electrons from the cathode and reduces to hydrogen gas. At the anode, the sulfate ion releases electrons to the anode and oxidizes to form oxygen gas.
The following are the balanced equations for these reactions:
2H⁺(aq) + 2e⁻ ⟶ H₂(g)
SO₄²⁻(aq) ⟶ O₂(g) + 4e⁻
Phenolphthalein is a pH indicator, and its color changes from colorless to pink as the pH increases above 8.2. When Na₂SO4 containing several drops of phenolphthalein is electrolyzed between Pt electrodes, the solution initially turns pink at the anode because OH⁻ ions are produced in excess, which increases the pH beyond 8.2.
However, at the cathode, the concentration of OH⁻ ions decreases as they react with the H+ ions to form water molecules. As a result, the solution around the cathode becomes acidic, and the pink color of phenolphthalein fades away.
Therefore, when a solution of Na₂SO4 containing several drops of phenolphthalein is electrolyzed between Pt electrodes, hydrogen gas, and oxygen gas are produced at the cathode and anode, respectively. The pink color of phenolphthalein fades away at the cathode due to the decrease in OH- concentration.
To know more about Hydrogen, refer here:
https://brainly.com/question/29765115#
#SPJ11
a student made a buffer using 0.750 moles of hcn and 0.250 moles of nacn dissolved into 2.00l of solution. a) what is the ph of the buffer? b) does this buffer have a higher capacity for additions of acid or additions of base? c) how much naoh can you add before the ph will change by 1 ph unit?
The pH of the buffer prepared using 0.750 moles of HCN and 0.250 moles of NaCN dissolved into 2.00l of the solution is 9.31.
What is the pH of the buffer?a) To determine the pH of the buffer, we need to first calculate the concentration of the acid and its conjugate base.
HCN is a weak acid and NACN is its conjugate base. The equation for the dissociation of HCN is:
HCN + H2O ⇌ H3O+ + CN-
The equilibrium constant for this reaction is Ka = [H3O+][CN-]/[HCN].
The concentration of HCN is 0.750 moles/2.00 L = 0.375 M
The concentration of CN- is 0.250 moles/2.00 L = 0.125 M
Therefore, Ka = (x)(x)/(0.375-x)
where x is the concentration of H3O+ and is assumed to be very small compared to 0.375.
Solving for x, we get x = 4.9 x 10^-10 M
Therefore, the pH of the buffer is pH = -log[H3O+]
pH = -log(4.9 x 10^-10)
pH = 9.31
b) The buffer has a higher capacity for additions of acid because it is made up of a weak acid and its conjugate base. The weak acid can neutralize added base, and the conjugate base can absorb added H3O+.
c) The pH will change by 1 pH unit when the amount of NaOH added is equal to the amount of HCN present in the buffer.
The moles of HCN in the buffer is 0.750 moles.
The reaction between NaOH and HCN is:
NaOH + HCN → NaCN + H2O
For every mole of HCN, we need one mole of NaOH to neutralize it.
Therefore, the amount of NaOH needed to change the pH by 1 unit is 0.750 moles.
Learn more about buffers at: https://brainly.com/question/13076037
#SPJ1
describe the major non-silicate minerals, including their general characteristics such as color, cleavage, and any diagnostic attributes.
The examples of the major non-silicate minerals include the following :carbonates, halides, Oxides and sulfides.
What are some of the general characteristics of non-silicate minerals?The general characteristics of non-silicate minerals include the following:
Carbonates: They contain metallic element such as calcium or magnesium linked with a carbon oxygen combination called carbonate.Oxides: They consist of oxygen bonded with iron, titanium, aluminum, or other metals. Sulfides: The sulfide ions (S)-2 bonded with iron, lead, zinc or copper.Halides : sodium or potassium and a halide element usually chlorine and a sulfur oxygen complex ion called sulfate.Learn more about minerals here:
https://brainly.com/question/27737827
#SPJ1
how is the elimination reaction different from the substitution reaction? how do we determine which one will happen and when? is there an example that breaks the rule one way or the other?
The elimination reaction is different from the substitution reaction because in the elimination reaction, two substituents are removed from a molecule to form a double bond or a ring.
In contrast, substitution reactions involve one substituent being replaced by another.In order to determine whether an elimination or substitution reaction will occur, the nature of the reactants and reaction conditions must be considered.
Factors such as the presence of a strong base, the leaving group ability of the substituent, and steric hindrance can all influence the outcome of a reaction.
For example, if a primary alkyl halide is reacted with a strong base such as sodium hydroxide in a polar solvent, an elimination reaction will likely occur due to the poor leaving group ability of the primary alkyl halide.
However, if a secondary or tertiary alkyl halide is reacted under the same conditions, a substitution reaction will likely occur due to the increased stability of the carbocation intermediate.There are exceptions to these general rules, such as the reaction between 2-methyl-2-butanol and hydrogen bromide.
In this case, the reaction can proceed through either an elimination or substitution pathway depending on the reaction conditions. Overall, the outcome of a reaction depends on a variety of factors and must be analyzed on a case-by-case basis.
To know more about elimination reaction click on below link:
https://brainly.com/question/29695970#
#SPJ11
a 175.0 ml solution of 2.594 m strontium nitrate is mixed with 215.0 ml of a 3.162 m sodium fluoride solution. calculate the mass of the resulting strontium fluoride precipitate.
The mass of the resulting strontium fluoride precipitate is 42.40 grams if a 175.0 ml solution of 2.594 m strontium nitrate is mixed with 215.0 ml of a 3.162 m sodium fluoride solution.
Volume of 2.594 M strontium nitrate = 175.0 mL = 0.175 L
Volume of 3.162 M sodium fluoride = 215.0 mL = 0.215 L
The Molar mass of SrF2 is 125.62 g/mole
Step 2: The balanced equation:
Sr(NO3)2(aq.) + 2NaF(aq.) → SrF2(s) + 2NaNO3(aq.)
From the balanced equation we know that, SrF2 will precipitate, NaNO3 will dissociate in 2Na+ + 2NO3-
The moles Sr(NO3)2 = molarity * volume
Moles Sr(NO3)2 is,
= 3.162 M * 0.175 L
= 0.553 moles
We have to calculate moles Na F.
moles Na F is,
= 3.162 M * 0.215 L
= 0.679 moles
We get that for 1 mole of Sr(NO3)2 we need 2 moles of Na F to produce 1 mole of SrF2 and 2 moles of NaNO3. here Na F is the limiting reactant.
There will Sr(NO3)2 is in excess react 0.553/2 = 0.276 moles which will precipitate.
There will remain 0.553 - 0.276 = 0.277 moles that will not precipitate.
Now we have to calculate moles of SrF2 produced. For 1 mole of Sr(NO3)2 we need 2 moles of Na F to produce 1 mole of SrF2 and 2 moles of NaNO3.
For 0.679 moles of Na F consumed, we produced 0.679/2 = 0.3375 moles of SrF2
Now we have to calculate mass of SrF2 produced
Mass SrF2 = moles SrF2 * molar mass SrF2
Mass SrF2 = 0.3375 moles * 125.62 g/mole
Mass SrF2 = 42.40 grams
The mass of the resulting strontium fluoride precipitate is 42.40 grams.
To learn more about Mass
https://brainly.com/question/1838164
#SPJ4
Universal waste shipments records must be retained for a minimum of three years
Universal waste is a category of hazardous waste that includes certain widely generated electronic devices, batteries, lamps, and other devices that contain hazardous materials.
The handling, storage, transportation, and disposal of universal waste is subject to regulations by the United States Environmental Protection Agency (EPA) under the Universal Waste Rule.
One of the requirements of the Universal Waste Rule is that records of universal waste shipments must be retained for a minimum of three years. This applies to any person who generates, collects, transports, or receives universal waste. The records must include the following information:
Name and address of the universal waste handler (generator, transporter, or receiving facility)EPA identification number of the universal waste handlerDate of shipmentType and quantity of universal waste shippedName and address of the transporter (if applicable)Retention of these records helps to ensure compliance with the regulations and enables tracking of the movement and disposition of universal waste. The records must be made available for inspection by authorized EPA officials upon request.
Learn more about Universal waste
https://brainly.com/question/14441506
#SPJ4
if you have a sample of an element, it is made of atoms that all have the same number of which type of particle in their nucleus?
The type of particle that all atoms of a given element share in the nucleus is the proton.
A proton is a positively charged subatomic particle. The number of protons in the nucleus of an atom is known as its atomic number, and it distinguishes one element from another.Elements can be identified by their unique atomic numbers, which correspond to the number of protons in their atomic nuclei. If you know an element's atomic number, you can also figure out the number of electrons it has if it's neutral. This is due to the fact that in a neutral atom, the number of electrons equals the number of protons.
More on elements: https://brainly.com/question/12784171
#SPJ11
if you require 30.75 ml of 0.1663 m n a o h n a o h solution to titrate 10.0 ml of h c 2 h 3 o 2 h c 2 h 3 o 2 solution, what is the molar concentration of acetic acid in the vinegar?
Answer : The molar concentration of acetic acid in the vinegar is 0.51 M.
The given question is about finding the molar concentration of acetic acid in vinegar. So, we need to use the given information to find the required answer. Let’s start with the balanced chemical equation of the reaction. Balanced Chemical Equation: NaOH + HC2H3O2 → NaC2H3O2 + H2O. This reaction is an acid-base reaction.
In this reaction, sodium hydroxide (NaOH) reacts with acetic acid (HC2H3O2) to form sodium acetate (NaC2H3O2) and water (H2O). According to the question, the volume of the NaOH solution is 30.75 ml and the concentration is 0.1663 M.Let's first calculate the number of moles of NaOH that react with 10 ml of HC2H3O2. Number of moles of NaOH = Molarity × Volume of NaOH (in liters) = 0.1663 M × (30.75/1000) L = 0.00511275 moles
This is the number of moles of acetic acid present in 10 ml of vinegar. We can use this information to calculate the molar concentration of acetic acid in vinegar. Molar concentration of acetic acid = Number of moles of acetic acid / Volume of vinegar (in liters).
The volume of vinegar is not given in the question. Therefore, we need to convert the volume of 10 ml into liters.10 ml = 10/1000 L = 0.01 LNow, we can substitute the values into the equation.Molar concentration of acetic acid = 0.00511275 moles / 0.01 L = 0.511275 M (rounded to 0.51 M)
Know more about acetic acid here:
https://brainly.com/question/15202177
#SPJ11
Which is an example of a covalent molecule?
a. CH4
b. NaCl
c. CuSO4
d. LiF
CH4 is an example of a covalent molecule.
Covalent molecules are formed when atoms share electrons between them to form a bond. In CH4, or methane, there is a single carbon atom that shares four electrons with four hydrogen atoms, resulting in a tetrahedral shape. Covalent molecules typically have low melting and boiling points, do not conduct electricity, and tend to have lower solubility in water compared to ionic compounds.
In contrast, ionic compounds, such as NaCl, CuSO4, and LiF, are formed from the transfer of electrons from one atom to another, resulting in the formation of positively and negatively charged ions. Ionic compounds typically have high melting and boiling points, are good conductors of electricity when dissolved in water, and have higher solubility in water compared to covalent molecules.
To know more about covalent click here:
brainly.com/question/30261436
#SPJ4
The vaporization of
from the liquid to the gas state requires 7.4 kcal/mol (31.0 kJ/mol).
What is the sign of
for this process? Write a reaction showing heat as a product or reactant.
How many kilocalories are needed to vaporize 5.8 mol of
How many kilojoules are needed to evaporate 82 g of
Evaporation is a different term for it. As particles move more quickly than liquid molecules, a liquid needs energy to transform into a gas.
What is the liquid vaporisation process?vaporisation is the process by which a substance is transformed from its liquid or solid state into its gaseous (vapour) state. Boiling is the term for the vaporisation process when conditions permit the creation of gas bubbles within a liquid. Sublimation is the process of directly converting a solid into a vapour.
How fast does vaporisation occur?The ratio of the time needed to evaporate a testing solvent to the time needed to evaporate a reference solvent under the same circumstances is the evaporation rate. The findings can be shown as either a percentage of the total amount evaporated within a given time frame, the amount of time needed to evaporate, or a relative rate.
To know more about energy visit:
https://brainly.com/question/8630757
#SPJ1
A lab technician adds 0.20 mol of NaF to 1.00 L of 0.35 M cadmium nitrate, Cd(NO3)2. Which of the following statements is correct? Ksp=6.44 x 10^(-3) for CdF2. A) The presence of NaF will raise the solubility of Cd(NO3)2B) The solubility of cadmium fluoride is increased by the presence of additional fluoride ions.C) One must know Ksp for cadmium nitrate to make meaningful predictions on this system. D) Cadmium fluoride precipitates until the solution is saturated. E) The solution is unsaturated and no precipitate forms. stel et shnt nan ha added to 1.00 L of
When a lab technician adds 0.20 mol of NaF to 1.00 L of 0.35 M cadmium nitrate, Cd(NO3)2, the correct statement is that B) The solubility of cadmium fluoride is increased by the presence of additional fluoride ions.
How does the addition of anions affect the solubility of salts?The solubility of salts is influenced by the presence of anions.
The solubility of salts is increased by the presence of anions in some cases. Anions reduce the solubility of salts in other cases. Cadmium nitrate (Cd(NO3)2) has a Ksp of 6.44 × 10−3, which must be compared to the ion product (IP) for Cd(NO3)2 in solution to decide whether precipitation will occur. Cd(NO3)2 is a soluble salt that ionizes according to the following equation:
Cd(NO3)2 → Cd2+ + 2 NO3−.
According to the solubility product rule, the IP for Cd(NO3)2 is determined as IP = [Cd2+][NO3−]^2. Because cadmium fluoride (CdF2) is less soluble than cadmium nitrate, it must be compared to the IP for CdF2 in solution to decide whether precipitation will occur. The ion product (IP) for CdF2 in solution can be calculated using the stoichiometry of the equilibrium between Cd2+ and F− ions: Cd2+(aq) + 2F−(aq) → CdF2(s).
Thus, IP = [Cd2+][F−]^2. As a result, the addition of fluoride ions to the Cd(NO3)2 solution in the form of NaF increases the solubility of cadmium fluoride because the concentration of F− ions is increased. As a result, option B is correct.
Learn more about solubility at
https://brainly.com/question/28170449
#SPJ11
liquids are anisotropic because their properties are independent of the axis of testing. true or false
Answer: Liquids are anisotropic because their properties are independent of the axis of testing. This statement is FALSE.
Anisotropy is the property of being directionally dependent, implying various qualities in various directions. In contrast to isotropy, which implies properties that are the same regardless of the direction of measurement. As a result, liquids are isotropic, indicating that their qualities do not differ based on the testing axis.
A material is anisotropic if its mechanical or physical properties differ depending on the direction of measurement. Solids, for example, can be anisotropic. When evaluating solids, it's frequently necessary to be aware of this property, which can have an impact on the data gathered during testing.
Therefore, liquids are not anisotropic because their properties are not dependent on the axis of testing. The correct statement is "Liquids are isotropic because their properties do not depend on the axis of testing."
Learn more about Anisotropy here:
https://brainly.com/question/28379789#
#SPJ11
3. The program can potentially
even send drones to spray a
substance that can slow the
spread of fire?
Answer:
h2-+2945-5456vjemrnfn
write an equation showing how the mass of the substance sought can be derived from the mass of the weighed substance on the right.