Question 1

Which property of water allows it to moderate Earth's climate by absorbing large amounts of heat with only a slight change in temperature?

Accepted Answer

Its high specific heat capacity

Question 2

If the electronegativity difference between two atoms is very large, what type of bond will most likely form?

Accepted Answer

Ionic bond

Question 3

Which of the following molecules is most likely to dissolve in water?

Accepted Answer

A polar molecule such as $$\mathrm{C_2H_5OH}$$

Question 4

A solution has a hydrogen ion concentration of $$0.0001\ \mathrm{M}. $$What is its pH?

Accepted Answer

$$\mathrm{pH\ 4}$$

Question 5

Which of the following best describes a buffer's function in biological systems?

Accepted Answer

Buffers prevent changes in pH when acids or bases are added

Question 6

When a strong acid is added to a solution containing carbonic acid ($$\mathrm{H_2CO_3}) $$and its conjugate base ($$\mathrm{$$HCO_3$$^-}$$), which form will increase in concentration?

Accepted Answer

The protonated form ($$\mathrm{H_2CO_3})$$

Question 7

Which of the following is NOT a covalent bond?

Accepted Answer

A bond between sodium and chloride in table salt ($$\mathrm{NaCl})$$

Question 8

Which of the following interactions is responsible for the clumping of nonpolar molecules, such as lipids, in water?

Accepted Answer

Hydrophobic interactions

Question 9

A buffer solution contains both $$\mathrm{H_2CO_3}$$ and $$\mathrm{$$HCO_3$$^-}. If a $$base is added, what will happen according to Le Chatelier's principle?

Accepted Answer

The reaction will shift to the right, producing more $$\mathrm{$$HCO_3$$^-}$$

Question 10

Which of the following best explains why ice floats in liquid water?

Accepted Answer

Ice is less dense than liquid water because its molecules are held further apart by hydrogen bonds

Question 11

Which of the following is a correct statement about polar covalent bonds?

Accepted Answer

Electrons are shared unequally, resulting in partial charges on atoms

Question 12

Which of the following molecules would be most likely to form hydrogen bonds with water?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 13

A solution A has pH 6 and solution B has pH 9. How many times greater is the hydrogen ion concentration in solution A compared to solution B?

Accepted Answer

100 times greater

Question 14

Which of the following is a real-life example of a buffer system in the human body?

Accepted Answer

The carbonic acid-bicarbonate system in blood

Question 15

Which of the following best describes hydrophobic interactions?

Accepted Answer

Exclusion of nonpolar molecules from water, causing them to aggregate

Question 16

Which of the following is true about the solubility of glucose in water?

Accepted Answer

Each glucose molecule is separated from each other by water molecules

Question 17

Which of the following is NOT a weak interaction?

Accepted Answer

Covalent bonding

Question 18

Which of the following best explains why buffers do not work at all pH values?

Accepted Answer

Buffers are only effective near their pKa value

Question 19

Which of the following is a consequence of water's high heat of vaporization?

Accepted Answer

A large amount of energy is required to raise the temperature of water

Question 20

Which of the following best describes the effect of adding a strong base to a buffer solution containing carbonic acid ($$\mathrm{H_2CO_3}) $$and bicarbonate ($$\mathrm{$$HCO_3$$^-}$$)?

Accepted Answer

The reaction will shift to the right, producing more $$\mathrm{$$HCO_3$$^-}$$

Covalent Bonds, Water, pH, and Buffers: Study Guide

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드