$$[H^+] = 1 \times 10$$^{-3}$$ M

Question 1

Which of the following statements best describes a Bronsted-Lowry acid?

Accepted Answer

A substance that donates an H$$^+$$ ion in water.

Question 2

Which of the following is a strong base commonly found in household cleaning products?

Accepted Answer

NaOH

Question 3

Consider the reaction: 2 HCl(aq) + Ca(OH)$$_2(aq$$) → 2 H$$_2O(l) + $$CaCl$$_2(aq). $$What type of reaction is this?

Accepted Answer

Neutralization

Question 4

Which of the following is NOT a correct statement about equilibrium in chemical reactions?

Accepted Answer

At equilibrium, the concentrations of reactants and products are equal.

Question 5

Given the equilibrium constant expression $$K_{eq} = \frac{[C][D]}{[A][B]}$$, which change will increase the value of $$K_{eq}$$?

Accepted Answer

Increasing the concentration of C and D.

Question 6

A solution has a pH of 3. What is the concentration of H$$^+$$ ions in the solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-3}$$ M

Question 7

Which of the following amino acids is classified as essential?

Accepted Answer

Leucine

Question 8

Which type of intermolecular force is primarily responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 9

A buffer solution is made by mixing a weak acid and its conjugate base. Which of the following best explains how a buffer resists changes in pH?

Accepted Answer

It neutralizes added acid or base by shifting the equilibrium.

Question 10

Which of the following changes will shift the equilibrium of an exothermic reaction to the left according to Le Chatelier's Principle?

Accepted Answer

Increasing the temperature

Question 11

What is the pOH of a solution with $$[OH^-] = 1 	imes 10$$^{-4}$$ M?

Accepted Answer

pOH = 4

Question 12

Which of the following best describes the role of disulfide bridges in protein structure?

Accepted Answer

They stabilize the tertiary structure by forming covalent bonds between cysteine residues.

Question 13

Which of the following is a correct statement about peptide bonds?

Accepted Answer

They are formed by condensation reactions between amino acids.

Question 14

A patient is suffering from metabolic acidosis. Which of the following would you expect to find in their blood?

Accepted Answer

Increased H$$^+$$ concentration and decreased pH

Question 15

Which of the following is a function of proteins in the immune system?

Accepted Answer

Antibodies recognize and bind to antigens.

Question 16

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

The active site of the enzyme has a unique shape that fits only specific substrates.

Question 17

Which of the following amino acids would most likely be found in the interior of a protein, away from water?

Accepted Answer

Valine

Question 18

Which of the following best describes the effect of increasing substrate concentration on enzyme activity, assuming enzyme concentration is constant?

Accepted Answer

Enzyme activity increases until it reaches a maximum rate (V$$_{max}).$$

Question 19

Which of the following is true about the quaternary structure of proteins?

Accepted Answer

It involves the assembly of multiple polypeptide chains.

Question 20

Which of the following statements about protein denaturation is correct?

Accepted Answer

Denaturation disrupts the secondary and tertiary structures, but not the primary structure.

Acids, Bases, and Proteins: GOB Chemistry Exam 4 Review Notes

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