Question 1

Which of the following statements best explains why branched hydrocarbons generally have lower boiling points than their straight-chain isomers?

Accepted Answer

Branched hydrocarbons have weaker London dispersion forces because their compact shape reduces surface contact.

Question 2

Which of the following is the correct IUPAC name for the molecule shown below?

$$\mathrm{CH_3CH_2CH_2COOH}$$

Accepted Answer

Butanoic acid

Question 3

A student mixes 0.1 mol of acetic acid ($$\mathrm{CH_3COOH}) $$with 0.1 mol of sodium acetate ($$\mathrm{CH_3COONa}) in 1 L of $$water. What is the primary function of this mixture in a biochemical context?

Accepted Answer

It acts as a buffer, resisting changes in pH.

Question 4

Which of the following best describes the tertiary structure of a protein?

Accepted Answer

The folding of the polypeptide chain due to interactions between side chains.

Question 5

Which metabolic pathway is responsible for the breakdown of glucose under anaerobic conditions in human muscle cells?

Accepted Answer

Glycolysis

Question 6

Which of the following statements about enzyme catalysis is correct?

Accepted Answer

Enzymes lower the activation energy, increasing the rate of reaction.

Question 7

A solution contains 0.01 M acetic acid ($$\mathrm{CH_3COOH}) $$and 0.01 M sodium acetate ($$\mathrm{CH_3COONa}). If $$the $$K_a of $$acetic acid is $$1.8 	imes 10$$^{-5}$$, what is the pH of the solution? (Assume $$\mathrm{pH} = \mathrm{p}K_a + \log \left( \frac{[	ext{A}^-]}{[	ext{HA}]} ight)$$)

Accepted Answer

pH = 4.74

Question 8

Which of the following is a correct description of the beta-oxidation pathway?

Accepted Answer

It breaks down fatty acids into acetyl-CoA units.

Question 9

Which intermolecular force is primarily responsible for the high boiling point of water?

Accepted Answer

Hydrogen bonding

Question 10

Which of the following is the correct systematic (IUPAC) name for the following structure?

$$\mathrm{CH_3CH_2CH_2CH_2OH}$$

Accepted Answer

1-Butanol

Question 11

Which of the following statements about carbohydrates is correct?

Accepted Answer

Monosaccharides are the simplest form of carbohydrates.

Question 12

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP stores and transfers energy for cellular processes.

Question 13

Which of the following is a correct statement about the structure of amino acids?

Accepted Answer

All amino acids contain a carboxyl group, an amino group, and a unique side chain attached to the alpha carbon.

Question 14

Which of the following is the correct product of the complete combustion of a hydrocarbon such as propane ($$\mathrm{C_3H_8}$$)?

Accepted Answer

$$\mathrm{CO_2$}$$ and $$\mathrm{H_2O}$$

Question 15

Which of the following best explains why saturated fatty acids have higher melting points than unsaturated fatty acids?

Accepted Answer

Saturated fatty acids pack more tightly due to their straight chains, increasing van der Waals interactions.

Question 16

Which of the following is a correct statement about the function of enzymes in biological systems?

Accepted Answer

Enzymes increase the rate of chemical reactions by lowering the activation energy.

Question 17

Which of the following is the correct description of a buffer solution?

Accepted Answer

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

Question 18

Which of the following is the correct formula for calculating the pH of a weak acid solution?

$$\mathrm{HA \rightleftharpoons H^+ + A^-}$$
$$K_a = \frac{[H^+][A^-]}{[HA]}$$

Accepted Answer

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

Question 19

Which of the following is a correct statement about the structure of phospholipids in cell membranes?

Accepted Answer

Phospholipids have a hydrophilic head and two hydrophobic tails, forming a bilayer in cell membranes.

Final Exam Review: Structure, Intermolecular Forces, and Biochemistry in General Chemistry

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