Question 1

Temperature usually increases when water condenses. Which behavior of water is most directly responsible for this phenomenon?

Accepted Answer

A)  the change in density when it condenses to form a liquid or solid
B)  reactions with other atmospheric compounds
C)  the release of heat by the formation of hydrogen bonds
D)  the release of heat by the breaking of hydrogen bonds
E)  the high surface tension of waterF) D) and E)
G) A) and B)

Question 2

One of the buffers that contribute to pH stability in human blood is carbonic acid H₂CO₃. Carbonic acid is a weak acid that when placed in an aqueous solution dissociates into a bicarbonate ion (HCO₃⁻) and a hydrogen ion (H⁺) . Thus, H₂CO₃ ↔ HCO₃⁻ + H⁺
If the pH of the blood increases, one would expect

Accepted Answer

A)  a decrease in the concentration of H₂CO₃ and an increase in the concentration of H₂O.
B)  an increase in the concentration of H₂CO₃ and a decrease in the concentration of H₂O.
C)  a decrease in the concentration of HCO₃⁻ and an increase in the concentration of H₂O.
D)  an increase in the concentration of HCO₃⁻ and a decrease in the concentration of H₂O.
E)  a decrease in the concentration of HCO₃⁻ and an increase in the concentration of both H₂CO₃ and H₂O.F) C) and D)
G) None of the above A

Question 3

One mole (mol) of a substance is

Accepted Answer

A)  6) 02 × 10²³ molecules 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 onlyF) None of the above
G) A) and E)

Question 4

Which type of bond must be broken for water to vaporize?

Accepted Answer

A)  ionic bonds
B)  nonpolar covalent bonds
C)  polar covalent bonds
D)  hydrogen bonds
E)  covalent bondsF) C) and D)
G) A) and D)

Question 5

Which of the following ionizes completely in solution and is considered to be a strong base (alkali) ?

Accepted Answer

A)  NaCl
B)  HCl
C)  NH₃
D)  H₂CO₃
E)  NaOHF) A) and D)
G) B) and E)

Question 6

A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.)

Accepted Answer

A)  50°C
B)  5°C
C)  10°C
D)  100°C
E)  1°CF) A) and D)
G) A) and E)

Question 7

One of the buffers that contribute to pH stability in human blood is carbonic acid (H₂CO₃) . Carbonic acid is a weak acid that dissociates into a bicarbonate ion (HCO₃⁻) and a hydrogen ion (H⁺) . Thus, H₂CO₃ ↔ HCO₃⁻ + H⁺
If the pH of the blood drops, one would expect

Accepted Answer

A)  a decrease in the concentration of H₂CO₃ and an increase in the concentration of HCO₃⁻.
B)  the concentration of hydroxide ion (OH⁻) to increase.
C)  the concentration of bicarbonate ion (HCO₃⁻) to increase.
D)  the HCO₃⁻ to act as a base and remove excess H⁺ with the formation of H₂CO₃.
E)  the HCO₃⁻ to act as an acid and remove excess H⁺ with the formation of H₂CO₃.F) C) and D)
G) D) and E)

Question 8

A solution contains 0.0000001(10⁻⁷) moles of hydroxyl ions [OH⁻] per liter. Which of the following best describes this solution?

Accepted Answer

A)  acidic: H⁺ acceptor
B)  basic: H⁺ acceptor
C)  acidic: H⁺ donor
D)  basic: H⁺ donor
E)  neutralF) A) and E)
G) B) and E) E

Question 9

-How many grams of the molecule in Figure 3.2 would be equal to 1 mol of the molecule?
(Carbon = 12, Oxygen = 16, Hydrogen = 1)

Accepted Answer

A)  29
B)  30
C)  60
D)  150
E)  342F) A) and C)
G) A) and B)

Question 10

An example of a hydrogen bond is the bond between

Accepted Answer

A)  C and H in methane (CH₄) .
B)  the H of one water molecule and the O of another water molecule.
C)  Na⁺and Cl⁻ in salt.
D)  the two hydrogen atoms in a molecule of hydrogen gas (H₂) .
E)  Mg⁺and Cl⁻ in MgCl₂.F) A) and E)
G) B) and E)

Question 11

A 100 mL beaker contains 10 mL of NaOH solution at pH = 13. A technician carefully pours into the beaker, 10 mL of HCl at pH = 1. Which of the following statements correctly describes the results of this mixing?

Accepted Answer

A)  The concentration of Na⁺ ion rises.
B)  The concentration of Cl⁻ ion falls.
C)  The concentration of undissociated H₂O molecules remains unchanged.
D)  The pH of the beaker's contents rises.
E)  The pH of the beaker's contents falls.F) B) and C)
G) None of the above

Question 12

Carbon dioxide (CO₂) is readily soluble in water, according to the equation CO₂ + H₂O → H₂CO₃. Carbonic acid (H₂CO₃) is a weak acid. If CO₂ is bubbled into a beaker containing pure, freshly-distilled water, which of the following graphs correctly describes the results?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) C) and D)
G) A) and C)

Question 13

-How many grams of the molecule in Figure 3.2 would be required to make 2.5 L of a 1 M solution of the molecule?
(Carbon = 12, Oxygen = 16, Hydrogen = 1)

Accepted Answer

A)  29
B)  30
C)  60
D)  150
E)  342F) C) and D)
G) A) and D)

Question 14

Assume that acid rain has lowered the pH of a particular lake to pH 4.0. What is the hydroxyl ion concentration of this lake?

Accepted Answer

A)  1 × 10⁻¹⁰ mol of hydroxyl ion per liter of lake water
B)  1 × 10⁻⁴ mol of hydroxyl ion per liter of lake water
C)  10.0 M with regard to hydroxyl ion concentration
D)  4.0 M with regard to hydroxyl ion concentration
E)  both B and DF) A) and E)
G) A) and B)

Question 15

At what temperature is water at its densest?

Accepted Answer

A)  0°C
B)  4°C
C)  32°C
D)  100°C
E)  212°CF) None of the above
G) C) and E)

Question 16

When an ionic compound such as sodium chloride (NaCl) is placed in water the component atoms of the NaCl crystal dissociate into individual sodium ions (Na⁺) and chloride ions (Cl⁻) . In contrast, the atoms of covalently bonded molecules (e.g., glucose, sucrose, glycerol) do not generally dissociate when placed in aqueous solution. Which of the following solutions would be expected to contain the greatest number of particles (molecules or ions) ?

Accepted Answer

A)  1 L of 0.5 M NaCl
B)  1 L of 0.5 M glucose
C)  1 L of 1.0 M NaCl
D)  1 L of 1.0 M glucose
E)  C and D will contain equal numbers of particles.F) A) and D)
G) C) and D) C

Question 17

What is the hydroxide ion concentration of the lake described in question 7?

Accepted Answer

A)  10⁻⁷ M
B)  10⁻⁴ M
C)  10⁻¹⁰ M
D)  10⁻¹⁴ M
E)  10 MF) All of the above
G) A) and B)

Question 18

We can be sure that a mole of table sugar and a mole of vitamin C are equal in their

Accepted Answer

A)  mass in daltons.
B)  mass in grams.
C)  number of molecules.
D)  number of atoms.
E)  volume.F) All of the above
G) A) and B)

Question 19

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

Accepted Answer

A)  pH 2
B)  pH 4
C)  pH 10
D)  pH 12
E)  pH 14F) A) and C)
G) A) and E)

Question 20

How many grams of acetic acid (C₂H₄O₂) would you use to make 10 L of a 0.1 M aqueous solution of acetic acid? (Note: The atomic masses, in daltons, are approximately 12 for carbon, 1 for hydrogen, and 16 for oxygen.)

Accepted Answer

A)  10.0 g
B)  0.1 g
C)  6.0 g
D)  60.0 g
E)  0.6 gF) None of the above
G) A) and E)

Exam 3: Water and the Fitness of the Environment

Temperature usually increases when water condenses. Which behavior of water is most directly responsible for this phenomenon?

Correct Answer
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Correct Answer
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A

One mole (mol) of a substance is

Correct Answer
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Which type of bond must be broken for water to vaporize?

Correct Answer
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Which of the following ionizes completely in solution and is considered to be a strong base (alkali) ?

Correct Answer
verified

A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.)

Correct Answer
verified

One of the buffers that contribute to pH stability in human blood is carbonic acid (H₂CO₃) . Carbonic acid is a weak acid that dissociates into a bicarbonate ion (HCO₃⁻) and a hydrogen ion (H⁺) . Thus, H₂CO₃ ↔ HCO₃⁻ + H⁺ If the pH of the blood drops, one would expect

Correct Answer
verified

A solution contains 0.0000001(10⁻⁷) moles of hydroxyl ions [OH⁻] per liter. Which of the following best describes this solution?

Correct Answer
verified
E

-How many grams of the molecule in Figure 3.2 would be equal to 1 mol of the molecule? (Carbon = 12, Oxygen = 16, Hydrogen = 1)

Correct Answer
verified

An example of a hydrogen bond is the bond between

Correct Answer
verified

A 100 mL beaker contains 10 mL of NaOH solution at pH = 13. A technician carefully pours into the beaker, 10 mL of HCl at pH = 1. Which of the following statements correctly describes the results of this mixing?

Correct Answer
verified

Carbon dioxide (CO₂) is readily soluble in water, according to the equation CO₂ + H₂O → H₂CO₃. Carbonic acid (H₂CO₃) is a weak acid. If CO₂ is bubbled into a beaker containing pure, freshly-distilled water, which of the following graphs correctly describes the results?

Correct Answer
verified

-How many grams of the molecule in Figure 3.2 would be required to make 2.5 L of a 1 M solution of the molecule? (Carbon = 12, Oxygen = 16, Hydrogen = 1)

Correct Answer
verified

Assume that acid rain has lowered the pH of a particular lake to pH 4.0. What is the hydroxyl ion concentration of this lake?

Correct Answer
verified

At what temperature is water at its densest?

Correct Answer
verified

Correct Answer
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C

What is the hydroxide ion concentration of the lake described in question 7?

Correct Answer
verified

We can be sure that a mole of table sugar and a mole of vitamin C are equal in their

Correct Answer
verified

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

Correct Answer
verified

How many grams of acetic acid (C₂H₄O₂) would you use to make 10 L of a 0.1 M aqueous solution of acetic acid? (Note: The atomic masses, in daltons, are approximately 12 for carbon, 1 for hydrogen, and 16 for oxygen.)

Correct Answer
verified

Exam 3: Water and the Fitness of the Environment

Temperature usually increases when water condenses. Which behavior of water is most directly responsible for this phenomenon?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedA

One mole (mol) of a substance is

Correct AnswerverifiedShow Answer

Which type of bond must be broken for water to vaporize?

Correct AnswerverifiedShow Answer

Which of the following ionizes completely in solution and is considered to be a strong base (alkali) ?

Correct AnswerverifiedShow Answer

A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.)

Correct AnswerverifiedShow Answer

One of the buffers that contribute to pH stability in human blood is carbonic acid (H₂CO₃) . Carbonic acid is a weak acid that dissociates into a bicarbonate ion (HCO₃⁻) and a hydrogen ion (H⁺) . Thus, H₂CO₃ ↔ HCO₃⁻ + H⁺ If the pH of the blood drops, one would expect

Correct AnswerverifiedShow Answer

A solution contains 0.0000001(10⁻⁷) moles of hydroxyl ions [OH⁻] per liter. Which of the following best describes this solution?

Correct AnswerverifiedE

-How many grams of the molecule in Figure 3.2 would be equal to 1 mol of the molecule? (Carbon = 12, Oxygen = 16, Hydrogen = 1)

Correct AnswerverifiedShow Answer

An example of a hydrogen bond is the bond between

Correct AnswerverifiedShow Answer

A 100 mL beaker contains 10 mL of NaOH solution at pH = 13. A technician carefully pours into the beaker, 10 mL of HCl at pH = 1. Which of the following statements correctly describes the results of this mixing?

Correct AnswerverifiedShow Answer

Carbon dioxide (CO₂) is readily soluble in water, according to the equation CO₂ + H₂O → H₂CO₃. Carbonic acid (H₂CO₃) is a weak acid. If CO₂ is bubbled into a beaker containing pure, freshly-distilled water, which of the following graphs correctly describes the results?

Correct AnswerverifiedShow Answer

-How many grams of the molecule in Figure 3.2 would be required to make 2.5 L of a 1 M solution of the molecule? (Carbon = 12, Oxygen = 16, Hydrogen = 1)

Correct AnswerverifiedShow Answer

Assume that acid rain has lowered the pH of a particular lake to pH 4.0. What is the hydroxyl ion concentration of this lake?

Correct AnswerverifiedShow Answer

At what temperature is water at its densest?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedC

What is the hydroxide ion concentration of the lake described in question 7?

Correct AnswerverifiedShow Answer

We can be sure that a mole of table sugar and a mole of vitamin C are equal in their

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How many grams of acetic acid (C₂H₄O₂) would you use to make 10 L of a 0.1 M aqueous solution of acetic acid? (Note: The atomic masses, in daltons, are approximately 12 for carbon, 1 for hydrogen, and 16 for oxygen.)

Correct AnswerverifiedShow Answer

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A

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E

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C

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