Question 1

Which of the following best describes what occurs during the oxidation of ethanol ($$\mathrm{CH_3CH_2OH}) to $$ethanal ($$\mathrm{CH_3CHO}) in an $$organic reaction?

Accepted Answer

Ethanol loses hydrogen atoms and is oxidized.

Question 2

Which of the following is the correct product when ethene ($$\mathrm{C_2H_4}) $$undergoes a hydration reaction?

Accepted Answer

$$\mathrm{C_2H_5OH} ($$ethanol)

Question 3

Which of the following statements about the solubility of gases in water is correct?

Accepted Answer

The solubility of a gas in water increases as pressure increases.

Question 4

Which of the following best describes the difference between a saturated and an unsaturated solution?

Accepted Answer

A saturated solution contains the maximum amount of solute that can dissolve at a given temperature.

Question 5

Which of the following is a correct application of Le Châtelier’s principle to the equilibrium below?

$$\mathrm{N_2$(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)}

If $$the pressure is increased, what will happen to the equilibrium?

Accepted Answer

The equilibrium will shift to the right, producing more $$\mathrm{NH_3$}.$$

Question 6

Which of the following is the correct classification for cellulose?

Accepted Answer

Polysaccharide

Question 7

Which of the following best describes the role of the bicarbonate buffer system in blood?

Accepted Answer

It regulates the pH of blood by neutralizing excess acids or bases.

Question 8

Which of the following is the correct formula for calculating the pH of a solution given the hydrogen ion concentration $$[\mathrm{H^+}]$$?

Accepted Answer

$$\mathrm{pH = -\log_{10}[H^+]}$$

Question 9

Which of the following is a correct example of a condensation reaction in organic chemistry?

Accepted Answer

The combination of two monosaccharides to form a disaccharide with the release of water.

Question 10

Which of the following best describes the difference between D- and L-glucose?

Accepted Answer

They are enantiomers, mirror images that cannot be superimposed.

Question 11

Which of the following is the correct equation for the dilution of a solution?

Accepted Answer

$$M_1V_1 = M_2V_2$$

Question 12

Which of the following statements about hydrogen bonding is correct?

Accepted Answer

Hydrogen bonds occur when hydrogen is bonded to highly electronegative atoms like O, N, or F.

Question 13

Which of the following is the correct net ionic equation for the neutralization of hydrochloric acid ($$\mathrm{HCl}) $$with sodium hydroxide ($$\mathrm{NaOH}$$)?

Accepted Answer

$$\mathrm{H^+ (aq) + OH^- (aq) \rightarrow H_2O (l)}$$

Question 14

Which of the following best describes the effect of increasing temperature on the solubility of most solid solutes in water?

Accepted Answer

Solubility increases as temperature increases.

Question 15

Which of the following is a correct example of a hydrolysis reaction?

Accepted Answer

The breakdown of a disaccharide into two monosaccharides using water.

Question 16

Which of the following is the correct relationship between pH and $$[\mathrm{OH^-}] in $$aqueous solution at 25°C?

Accepted Answer

$$\mathrm{pH + pOH = 14}$$

Question 17

Which of the following best describes the 'like dissolves like' rule for solubility?

Accepted Answer

Polar solutes dissolve best in polar solvents.

Question 18

Which of the following is the correct definition of a buffer?

Accepted Answer

A solution that resists changes in pH when small amounts of acid or base are added.

Question 19

Which of the following is the correct formula for calculating the molarity ($$M) of a $$solution?

Accepted Answer

$$M = \dfrac{	ext{moles of solute}}{	ext{liters of solution}}$$

GOB Chemistry Study Guide: Chapters 5–9 Key Concepts and Applications

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