## Chapter 3

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# One mole (mol) of a substance isA) 6.02× 1023molecules of the substance.B) 1 g of the substance dissolved in 1 L of solution.C) the largest amount of the substance that can be dissolved in 1 L of solution.D) the molecular mass of the substance expressed in grams.E) A and D only

E) A and D only

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How many molecules of glucose (C6H2O6molecular mass =180 daltons) would be presentin one mole of glucose?

A) 24

B) 342

C) 23 × 1014

D) 180 × 1014

E) 6.02 × 1023

E) 6.02 × 1023

When an ionic compound such as sodium chloride (NaCl) is placed in water the componentatoms of the NaCl crystal dissociate into individual sodium ions (Na+) and chloride ions (Cl-). Incontrast, the atoms of covalently bonded molecules (e.g., glucose, sucrose, glycerol) do notgenerally dissociate when placed in aqueous solution. Which of the following solutions would beexpected to contain the greatest number of particles (molecules or ions)?

A) 1 L of 0.5MNaCl

B) 1 L of 0.5Mglucose

C) 1 L of 1.0MNaCl

D) 1 L of 1.0Mglucose

E) C and D will contain equal numbers of particles.

C) 1 L of 1.0MNaCl

The molecular mass of glucose is 180 g. Which of the following procedures should you carryout to make a 1Msolution of glucose?

A) Dissolve 1 g of glucose in 1 L of water.

B) Dissolve 180 g of glucose in 1 L of water.

C) Dissolve 180 g of glucose in 100 g of water.

D) Dissolve 180 mg (milligrams) of glucose in 1 L of water.

E) Dissolve 180 g of glucose in water, and then add more water until the total volume of the

solution is 1 L.

E) Dissolve 180 g of glucose in water, and then add more water until the total volume of thesolution is 1 L.

The molecular mass of glucose (C6H12O6) is 180 g. Which of the following proceduresshould youcarry out to make a 0.5 M solution of glucose?

A) Dissolve 0.5 g of glucose in a small volume of water, and then add more water until the totalvolume of solution is 1 L.

B) Dissolve 90 g of glucose in a small volume of water, and then add more water until the totalvolume of the solution is 1 L.

C) Dissolve 180 g of glucose in a small volume of water, and then add more water until the totalvolume of the solution is 1 L.

D) Dissolve 0.5 g of glucose in 1 L of water.

E) Dissolve 180 g of glucose in 1 Lof water.

B) Dissolve 90 g of glucose in a small volume of water, and then add more water until the totalvolume of the solution is 1 L.

You have a freshly-prepared 0.1M solution of glucose in water. Each liter of this solutioncontains how many glucose molecules?

A) 6.02 × 1023

B) 3.01 × 1023

C) 6.02 × 1024

D) 12.04 × 1023

E) 6.02 × 1022

C) 6.02 × 1024

The molecular weight of water is 18 daltons. What is the molarity of 1 liter of pure water?

A) 55.6M

B) 18M

C) 37M

D) 0.66M

E) 1.0M

A) 55.6M

You have a freshly-prepared 1M solution of glucose in water. You carefully pour out a 100mL sample of that solution. How many glucose molecules are included in that 100 mL sample?

A) 6.02 × 1023

B) 3.01 × 1023

C) 6.02 × 1024

D) 12.04 × 1023

E) 6.02 × 1

C) 6.02 × 1024

A given solution contains 0.0001(10) moles of hydrogen ions [H] per liter. Which of thefollowing best describes this solution?

A) acidic: H+acceptor

B) basic: H+acceptor

C) acidic: H+donor

D) basic: H+donor

E) neutral

C) acidic: H+donor

What is the pH of a solution with a hydroxyl ion [OH-] concentration of 10-12M?

A) pH 2

B) pH 4

C) pH 10

D) pH 12

E) pH 14

A) pH 2

What is the pH of a solution with a hydrogen ion [H+] concentration of 10-8M?

A) pH 2

B) pH 4

C) pH 6

D) pH 8

E) pH 10

D) pH 8

Which of the following statements about water is correct?

A) Water is more dense as a solid than it is as a liquid

B) Water is less dense as ice than it is as liquid

C) Water is a good solvent for lipids

D) Compared to most other substances, the temperature of water rises sharply when is absorbs heat

E) Compared to most liquids, the evaporation of water requires very little heat

B) Water is less dense as a solid
Chapter 3
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