25 mL of a growth medium containing bacteria at a concentration of 3 F1F1F1S1F1F1F10 105 cells per litre is diluted to a volume of 0.05 L. What is the concentration of bacteria after dilution?

A) 1.5 F1F1F1S1F1F1F10 106 cells L-1 B) 1.75 F1F1F1S1F1F1F10 108 cells L-1 C) 6.7 F1F1F1S1F1F1F10 10-6 cells L-1 D) 6 F1F1F1S1F1F1F10 105 cells L-1 E) 1.5 F1F1F1S1F1F1F10 105 cells L-1 A) 1.5 F1F1F1S1F1F1F10 106 cells L-1 B) 1.75 F1F1F1S1F1F1F10 108 cells L-1 C) 6.7 F1F1F1S1F1F1F10 10-6 cells L-1 D) 6 F1F1F1S1F1F1F10 105 cells L-1 E) 1.5 F1F1F1S1F1F1F10 105 cells L-1 E

What is the mass of 1.5 mol CH3OH?

A) 48 g B) 21.333 g C) 32 g D) 0.05 g E) 1.5 g A) 48 g B) 21.333 g C) 32 g D) 0.05 g E) 1.5 g

Exam 5: Moles, Concentrations, and Dilutions: Making Sense of Chemical Numbers

25 mL of a growth medium containing bacteria at a concentration of 3  10⁵ cells per litre is diluted to a volume of 0.05 L. What is the concentration of bacteria after dilution?

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(Multiple Choice)

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Question 1

Correct Answer:

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Which of the following is the correct mass of one mole of ¹²C?

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(Multiple Choice)

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Question 2

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How many moles are there in 30 g of C?

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(Multiple Choice)

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Question 3

Correct Answer:

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The molar mass of a compound has which of the following units?

(Multiple Choice)

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Question 4

A substance, X, has a molar absorptivity of 1250 L mol^-1 cm^-1 at 325 nm. A sample of X gives an absorbance of 0.8 when measured in a UV-visible spectrophotometer at 325 nm with a path length of 1 cm. What is the concentration of the sample of X?

(Multiple Choice)

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Question 5

How many moles are there in 121.6 g of glycine?

(Multiple Choice)

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Question 6

What is the concentration of 100 mL of a solution containing 2.5 moles of glucose?

(Multiple Choice)

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Question 7

2 moles of the amino acid glycine have a mass of 152

(Multiple Choice)

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Question 8

You can have a mole of which of the following? Select any that apply.

(Multiple Choice)

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Question 9

What is the mass of 1.5 mol CH₃OH?

(Multiple Choice)

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Question 10

Which of the following has the greatest mass, noting that the molar mass of carbon is 12; the molar mass of oxygen is 16; the molar mass of hydrogen is 1; and the molar mass of nitrogen is 15?

(Multiple Choice)

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Question 11

Which of the following two quantities are identical?

(Multiple Choice)

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Question 12

We have 100 mL of a solution of NaCl with a concentration of 0.5 mol L^-1 and want to dilute it to a concentration of 0.1 mol L^-1. How much water would we need to add to achieve this?

(Multiple Choice)

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Question 13

The concentration of a substance is defined as the number of moles in what volume?

(Multiple Choice)

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Question 14

A sample of a solution with concentration of 0.005 mol L^-1 has a molar absorptivity of 150 L mol^-1 cm^-1 at 350 nm. What absorbance will be measured by a UV-visible spectrophotometer when the sample is measured in a cuvette with a path length of 1 cm at 350 nm?

(Multiple Choice)

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Question 15

What amount of hydrogen chloride is present in 500 mL of a solution with a concentration of 0.5 mol L^-1?

(Multiple Choice)

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Question 16

How many moles are present in 10 mL of a sodium chloride (salt) solution, with a concentration of 2 mol L^-1?

(Multiple Choice)

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Question 17

Two compounds, A and B, react with the stoichiometry 1:3, i.e. A + 3B. If there are 0.1 moles of A present in a sample initially, how many moles of B must be added for A to be completely consumed?

(Multiple Choice)

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Question 18

A solution containing red blood cells at a concentration of 2000 cells per mL undergoes three serial dilution steps, whereby 1 mL of starting solution is diluted with 9 mL of solvent at each step. What is the concentration of red blood cells after the final dilution step?

(Multiple Choice)

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Question 19

How many moles of NaOH do we need to prepare 250 mL of a 2M solution?

(Multiple Choice)

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Question 20

Showing 1 - 20 of 22

25 mL of a growth medium containing bacteria at a concentration of 3  10⁵ cells per litre is diluted to a volume of 0.05 L. What is the concentration of bacteria after dilution?

Which of the following is the correct mass of one mole of ¹²C?

How many moles are there in 30 g of C?

The molar mass of a compound has which of the following units?

A substance, X, has a molar absorptivity of 1250 L mol^-1 cm^-1 at 325 nm. A sample of X gives an absorbance of 0.8 when measured in a UV-visible spectrophotometer at 325 nm with a path length of 1 cm. What is the concentration of the sample of X?

How many moles are there in 121.6 g of glycine?

What is the concentration of 100 mL of a solution containing 2.5 moles of glucose?

2 moles of the amino acid glycine have a mass of 152

You can have a mole of which of the following? Select any that apply.

What is the mass of 1.5 mol CH₃OH?

Which of the following has the greatest mass, noting that the molar mass of carbon is 12; the molar mass of oxygen is 16; the molar mass of hydrogen is 1; and the molar mass of nitrogen is 15?

Which of the following two quantities are identical?

We have 100 mL of a solution of NaCl with a concentration of 0.5 mol L^-1 and want to dilute it to a concentration of 0.1 mol L^-1. How much water would we need to add to achieve this?

The concentration of a substance is defined as the number of moles in what volume?

A sample of a solution with concentration of 0.005 mol L^-1 has a molar absorptivity of 150 L mol^-1 cm^-1 at 350 nm. What absorbance will be measured by a UV-visible spectrophotometer when the sample is measured in a cuvette with a path length of 1 cm at 350 nm?

What amount of hydrogen chloride is present in 500 mL of a solution with a concentration of 0.5 mol L^-1?

How many moles are present in 10 mL of a sodium chloride (salt) solution, with a concentration of 2 mol L^-1?

Two compounds, A and B, react with the stoichiometry 1:3, i.e. A + 3B. If there are 0.1 moles of A present in a sample initially, how many moles of B must be added for A to be completely consumed?

A solution containing red blood cells at a concentration of 2000 cells per mL undergoes three serial dilution steps, whereby 1 mL of starting solution is diluted with 9 mL of solvent at each step. What is the concentration of red blood cells after the final dilution step?

How many moles of NaOH do we need to prepare 250 mL of a 2M solution?

Chemical Analysis: Characterizing Chemical Compounds

Acids, Bases, and Buffer Solutions: Life in an Aqueous Environment

Kinetics: What Affects the Speed of a Reaction

Equilibria: How Far Do Reactions Go

Energy: What Makes Reactions Go

Reaction Mechanisms: The Chemical Changes That Drive the Chemistry of Life

Chemical Reactions, Oxidation, and Reduction: Bringing Molecules to Life

Metals in Biology: Life Beyond Carbon

Biological Macromolecules: The Infrastructure of Life

Isomerism: Generating Chemical Variety

Molecular Shape and Structure: Life in Three Dimensions

Functional Groups: Adding Function to the Framework of Life

Hydrocarbons: The Framework of Life

Molecular Interactions: Holding It All Together

Compounds and Chemical Bonding: Bringing Atoms Together

Atoms: The Foundations of Life

Introduction: Why Biologists Need Chemistry

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Exam 5: Moles, Concentrations, and Dilutions: Making Sense of Chemical Numbers

25 mL of a growth medium containing bacteria at a concentration of 3  105 cells per litre is diluted to a volume of 0.05 L. What is the concentration of bacteria after dilution?

Which of the following is the correct mass of one mole of 12C?

How many moles are there in 30 g of C?

The molar mass of a compound has which of the following units?

A substance, X, has a molar absorptivity of 1250 L mol-1 cm-1 at 325 nm. A sample of X gives an absorbance of 0.8 when measured in a UV-visible spectrophotometer at 325 nm with a path length of 1 cm. What is the concentration of the sample of X?

How many moles are there in 121.6 g of glycine?

What is the concentration of 100 mL of a solution containing 2.5 moles of glucose?

2 moles of the amino acid glycine have a mass of 152

You can have a mole of which of the following? Select any that apply.

What is the mass of 1.5 mol CH3OH?

Which of the following has the greatest mass, noting that the molar mass of carbon is 12; the molar mass of oxygen is 16; the molar mass of hydrogen is 1; and the molar mass of nitrogen is 15?

Which of the following two quantities are identical?

We have 100 mL of a solution of NaCl with a concentration of 0.5 mol L-1 and want to dilute it to a concentration of 0.1 mol L-1. How much water would we need to add to achieve this?

The concentration of a substance is defined as the number of moles in what volume?

A sample of a solution with concentration of 0.005 mol L-1 has a molar absorptivity of 150 L mol-1 cm-1 at 350 nm. What absorbance will be measured by a UV-visible spectrophotometer when the sample is measured in a cuvette with a path length of 1 cm at 350 nm?

What amount of hydrogen chloride is present in 500 mL of a solution with a concentration of 0.5 mol L-1?

How many moles are present in 10 mL of a sodium chloride (salt) solution, with a concentration of 2 mol L-1?

Two compounds, A and B, react with the stoichiometry 1:3, i.e. A + 3B. If there are 0.1 moles of A present in a sample initially, how many moles of B must be added for A to be completely consumed?

A solution containing red blood cells at a concentration of 2000 cells per mL undergoes three serial dilution steps, whereby 1 mL of starting solution is diluted with 9 mL of solvent at each step. What is the concentration of red blood cells after the final dilution step?

How many moles of NaOH do we need to prepare 250 mL of a 2M solution?

Chemical Analysis: Characterizing Chemical Compounds

Acids, Bases, and Buffer Solutions: Life in an Aqueous Environment

Kinetics: What Affects the Speed of a Reaction

Equilibria: How Far Do Reactions Go

Energy: What Makes Reactions Go

Reaction Mechanisms: The Chemical Changes That Drive the Chemistry of Life

Chemical Reactions, Oxidation, and Reduction: Bringing Molecules to Life

Metals in Biology: Life Beyond Carbon

Biological Macromolecules: The Infrastructure of Life

Isomerism: Generating Chemical Variety

Molecular Shape and Structure: Life in Three Dimensions

Functional Groups: Adding Function to the Framework of Life

Hydrocarbons: The Framework of Life

Molecular Interactions: Holding It All Together

Compounds and Chemical Bonding: Bringing Atoms Together

Atoms: The Foundations of Life

Introduction: Why Biologists Need Chemistry

Filters

25 mL of a growth medium containing bacteria at a concentration of 3  10⁵ cells per litre is diluted to a volume of 0.05 L. What is the concentration of bacteria after dilution?

Which of the following is the correct mass of one mole of ¹²C?

A substance, X, has a molar absorptivity of 1250 L mol^-1 cm^-1 at 325 nm. A sample of X gives an absorbance of 0.8 when measured in a UV-visible spectrophotometer at 325 nm with a path length of 1 cm. What is the concentration of the sample of X?

What is the mass of 1.5 mol CH₃OH?

We have 100 mL of a solution of NaCl with a concentration of 0.5 mol L^-1 and want to dilute it to a concentration of 0.1 mol L^-1. How much water would we need to add to achieve this?

A sample of a solution with concentration of 0.005 mol L^-1 has a molar absorptivity of 150 L mol^-1 cm^-1 at 350 nm. What absorbance will be measured by a UV-visible spectrophotometer when the sample is measured in a cuvette with a path length of 1 cm at 350 nm?

What amount of hydrogen chloride is present in 500 mL of a solution with a concentration of 0.5 mol L^-1?

How many moles are present in 10 mL of a sodium chloride (salt) solution, with a concentration of 2 mol L^-1?