Question 1

When sodium hydroxide (NaOH)  is added to water, it ionizes, releasing OH- and Na+ ions. The resulting solution is

Accepted Answer

A)   acidic.
B)   basic.
C)   neutral.
D)   molar.
E)   a buffer.F) All of the above
G) A) and E)

Question 2

Cola has a pH of 3; blood plasma has a pH of 7. The hydrogen ion concentration of cola is _______ than the hydrogen ion concentration of blood plasma.

Accepted Answer

A)   4 times greater
B)   4 times smaller
C)   400 times greater
D)   10,000 times greater
E)   30,000 times greaterF) C) and E)
G) A) and C)

Question 3

The chemical properties of an element are determined by the number of _______ its atoms contain.

Accepted Answer

The answer of The chemical properties of an element are...

Question 4

Of the following compounds containing 1H, 12C, and 16O, the one with the greatest number of molecules in a sample with a mass of 2 grams would be

Accepted Answer

A)   CO.
B)   CO2.
C)   HCOOH.
D)   C2H5OH.
E)   C6H12O6.F) B) and D)
G) D) and E)

Question 5

Molecules that have an unequal distribution of electric charge are called _______ molecules.

Accepted Answer

The answer of Molecules that have an unequal distribution of...

Question 6

Which of the following correctly states an unusual property of water?

Accepted Answer

A)   Water will not react with other atoms.
B)   Water's solid state is denser than its liquid state.
C)   Energy is not required to change water from a solid to a liquid.
D)   Little heat energy is needed to raise the temperature of water.
E)   The hydrogen bonds between water molecules continually form and break.F) A) and B)
G) B) and C)

Question 7

Which of the following statements about chemical reactions is true?

Accepted Answer

A)   The bonding partners of atoms remain constant.
B)   All reactions release energy as they proceed.
C)   The bonding partners of atoms change.
D)   All reactions consume energy as they proceed.
E)   None of the aboveF) B) and E)
G) A) and B)

Question 8

Sweating is a useful cooling device for humans because water

Accepted Answer

A)   takes up a great deal of heat in changing from its liquid state to its gaseous state.
B)   takes up a great deal of heat in changing from its solid state to its liquid state.
C)   can exist in three states at temperatures common on Earth.
D)   is an outstanding solvent.
E)   ionizes readily.F) B) and C)
G) C) and E)

Question 9

Solid salt, NaCl, is neutral. When dissolved in water, NaCl

Accepted Answer

A)   remains as NaCl (does not dissociate) .
B)   dissociates to form Na- and Cl+.
C)   dissociates to form Na+ and Cl- ions that do not interact with water molecules.
D)   dissociates to form Na+ and Cl- ions that interact with water molecules.
E)   does not dissociate, but interacts with water molecules.F) A) and B)
G) C) and E)

Question 10

Which of the following statements about chemical reactions is false?

Accepted Answer

A)   They occur when atoms combine or change their bonding partners.
B)   Energy may be created or destroyed in a chemical reaction.
C)   Reactions may go to completion.
D)   Changes in forms of energy may accompany chemical reactions.
E)   The products of a chemical reaction are formed from the reactants.F) A) and C)
G) A) and B)

Question 11

Rank the following solutions in order from the most acidic to the most basic: lemon juice, pH = 2; Mylanta, pH = 10; Sprite, pH = 3; drain cleaner, pH = 15; seawater, pH = 8. Of the preceding, which has the highest concentration of H+ ions? Which has the lowest concentration of H+ ions?

Accepted Answer

Lemon juice, pH = 2 (highest c...

Question 12

Which of the following statements about covalent bonds is not true?

Accepted Answer

A)   A covalent bond is stronger than a hydrogen bond.
B)   A covalent bond can form between atoms of the same element.
C)   Only a single covalent bond can form between two atoms.
D)   A covalent bond results from the sharing of electrons by two atoms.
E)   A covalent bond can form between atoms of different elements.F) A) and D)
G) A) and E)

Question 13

Two characteristics of water make it different from most other compounds: Its solid state is _______ its liquid state and it takes up _______ heat to change to its gaseous state.

Accepted Answer

A)   less dense than; large amounts of
B)   more dense than; small amounts of
C)   less dense than; small amounts of
D)   more dense than; large amounts of
E)   just as dense as; noF) C) and E)
G) D) and E)

Question 14

The molecular weight of acetic acid is 60. How many grams of acetic acid would be required to prepare 10 ml of a 0.001 M (1.0 mM)  solution?

Accepted Answer

A)   6.0
B)   0.6
C)   0.0006
D)   0.06
E)   0.006F) A) and C)
G) B) and D)

Question 15

The reaction HCl  →	o→  H+ + Cl- in the human stomach is an example of the

Accepted Answer

A)   cleavage of a hydrophobic bond.
B)   formation of a hydrogen bond.
C)   elevation of the pH of the stomach.
D)   formation of ions by dissolving an acid.
E)   formation of polar covalent bonds. F) All of the above
G) A) and E)

Question 16

The mass number of an atom is determined primarily by the _______ it contains.

Accepted Answer

A)   number of electrons
B)   number of protons
C)   sum of the number of protons and electrons
D)   sum of the number of protons and neutrons
E)   number of chargesF) C) and D)
G) All of the above

Question 17

You have discovered that a molecule is hydrophilic. What else do you know about this molecule?

Accepted Answer

A)   It cannot form hydrogen bonds.
B)   It is a polar molecule.
C)   It is a nonpolar molecule.
D)   It has a partial positive region and a partial negative region.
E)   Both b and dF) D) and E)
G) A) and B)

Question 18

Why is the atomic weight of hydrogen 1.008 and not exactly its mass number, 1.000?

Accepted Answer

A)   Atomic weight does not take into account the weight of rare isotopes of an element.
B)   Atomic weight is the average of the mass numbers of a representative sample of the element, including all its isotopes.
C)   The atomic weight includes the weight of the electrons.
D)   The atomic weight does not include the weight of the protons.
E)   The mass number of an element is always lower than its atomic weight.F) A) and D)
G) A) and C)

Question 19

Water is essential to life. Which of the following physical properties of water affect(s)  life in some beneficial way?

Accepted Answer

A)   Cohesiveness
B)   High heat capacity
C)   High heat of vaporization
D)   Ice is less dense than liquid water
E)   All of the aboveF) A) and B)
G) A) and C)

Question 20

The water strider skates along the surface of water due to a property of liquids called _______.

Accepted Answer

The answer of The water strider skates along the surface...

Exam 2: Small Molecules and the Chemistry of Life

You have discovered that a molecule is hydrophilic. What else do you know about this molecule?

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Which of the following statements about chemical reactions is true?

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Which of the following statements about chemical reactions is false?

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Cola has a pH of 3; blood plasma has a pH of 7. The hydrogen ion concentration of cola is _______ than the hydrogen ion concentration of blood plasma.

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Solid salt, NaCl, is neutral. When dissolved in water, NaCl

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The molecular weight of acetic acid is 60. How many grams of acetic acid would be required to prepare 10 ml of a 0.001 M (1.0 mM) solution?

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The water strider skates along the surface of water due to a property of liquids called _______.

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The mass number of an atom is determined primarily by the _______ it contains.

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Two characteristics of water make it different from most other compounds: Its solid state is _______ its liquid state and it takes up _______ heat to change to its gaseous state.

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Water is essential to life. Which of the following physical properties of water affect(s) life in some beneficial way?

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Rank the following solutions in order from the most acidic to the most basic: lemon juice, pH = 2; Mylanta, pH = 10; Sprite, pH = 3; drain cleaner, pH = 15; seawater, pH = 8. Of the preceding, which has the highest concentration of H+ ions? Which has the lowest concentration of H+ ions?

Correct AnswerverifiedLemon juice, pH = 2 (highest c...View AnswerShow Answer

Which of the following correctly states an unusual property of water?

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Sweating is a useful cooling device for humans because water

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Which of the following statements about covalent bonds is not true?

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The reaction HCl →\to→ H+ + Cl- in the human stomach is an example of the

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Molecules that have an unequal distribution of electric charge are called _______ molecules.

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Why is the atomic weight of hydrogen 1.008 and not exactly its mass number, 1.000?

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When sodium hydroxide (NaOH) is added to water, it ionizes, releasing OH- and Na+ ions. The resulting solution is

Correct AnswerverifiedShow Answer

The chemical properties of an element are determined by the number of _______ its atoms contain.

Correct AnswerverifiedShow Answer

Of the following compounds containing 1H, 12C, and 16O, the one with the greatest number of molecules in a sample with a mass of 2 grams would be

Correct AnswerverifiedShow Answer

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Two characteristics of water make it different from most other compounds: Its solid state is _ its liquid state and it takes up _ heat to change to its gaseous state.

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Rank the following solutions in order from the most acidic to the most basic: lemon juice, pH = 2; Mylanta, pH = 10; Sprite, pH = 3; drain cleaner, pH = 15; seawater, pH = 8. Of the preceding, which has the highest concentration of H⁺ ions? Which has the lowest concentration of H⁺ ions?

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Lemon juice, pH = 2 (highest c...
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The reaction HCl $\to$ H⁺ + Cl^- in the human stomach is an example of the

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When sodium hydroxide (NaOH) is added to water, it ionizes, releasing OH^- and Na⁺ ions. The resulting solution is

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Of the following compounds containing ¹H, ¹²C, and ¹⁶O, the one with the greatest number of molecules in a sample with a mass of 2 grams would be

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