Q: A solution has a pH of 3.0. What is the concentration of $$\mathrm{H}^+$$ ions in the solution?

$$1 \times 10$$^{-3}$$\ \mathrm{M}$$

Question 1

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

Accepted Answer

ATP stores and transfers energy for cellular processes by releasing a phosphate group.

Question 2

A solution is prepared by dissolving 5.00 g of NaCl in enough water to make 250 mL of solution. What is the molarity of the solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 3

Which of the following statements about acids and bases is correct according to the Brønsted-Lowry theory?

Accepted Answer

An acid is a substance that donates a proton ($$\mathrm{H}^+) to $$another substance.

Question 4

A patient is given an intravenous solution that is hypertonic relative to their blood plasma. What is the most likely effect on the patient's red blood cells?

Accepted Answer

The red blood cells will shrink due to water leaving the cells.

Question 5

Which of the following is the correct electron configuration for a neutral atom of magnesium ($$\mathrm{Mg}$$, atomic number 12)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$

Question 6

Which of the following functional groups is present in all amino acids?

Accepted Answer

A carboxyl group ($$-\mathrm{COOH}) $$and an amino group ($$-\mathrm{NH}_2)$$

Question 7

A sample of gas occupies 2.50 L at 1.00 atm and 300 K. What will be its volume at 2.00 atm and 300 K, assuming ideal gas behavior?

Accepted Answer

$$1.25\ \mathrm{L}$$

Question 8

Which of the following best explains why water is a good solvent for ionic compounds?

Accepted Answer

Water molecules are polar and can stabilize ions through ion-dipole interactions.

Question 9

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{OH}$$?

Accepted Answer

Propanol

Question 10

A buffer solution is prepared by mixing acetic acid ($$\mathrm{CH}_3\mathrm{COOH}) $$and sodium acetate ($$\mathrm{CH}_3\mathrm{COONa}). $$What is the primary function of this buffer in a biological system?

Accepted Answer

To maintain a relatively constant pH when small amounts of acid or base are added.

Question 11

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy of biochemical reactions.

Question 12

A carbohydrate with the formula $$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 is $$classified as which of the following?

Accepted Answer

Monosaccharide

Question 13

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 14

A solution has a pH of 3.0. What is the concentration of $$\mathrm{H}^+$$ ions in the solution?

Accepted Answer

$$1 	imes 10$$^{-3}$$\ \mathrm{M}$$

Question 15

Which of the following best explains why proteins can function as enzymes, hormones, and structural components in living organisms?

Accepted Answer

Proteins have diverse three-dimensional structures determined by their amino acid sequences.

Question 16

Which of the following is a correct statement about the structure of DNA?

Accepted Answer

DNA is a double helix composed of two antiparallel strands held together by hydrogen bonds between complementary bases.

Question 17

A chemical reaction has a $$\Delta H ($$change in enthalpy) of $$-150\ \mathrm{kJ/mol}. $$What does this indicate about the reaction?

Accepted Answer

The reaction is exothermic and releases heat to the surroundings.

Question 18

Which of the following best describes the function of hemoglobin in the human body?

Accepted Answer

Hemoglobin transports oxygen from the lungs to tissues.

Question 19

Which of the following is the correct balanced equation for the complete combustion of ethanol ($$\mathrm{C}_2\mathrm{H}_5\mathrm{OH}$$)?

Accepted Answer

$$\mathrm{C}_2\mathrm{H}_5\mathrm{OH} + 3\ \mathrm{O}_2 \rightarrow 2\ \mathrm{CO}_2 + 3\ \mathrm{H}_2\mathrm{O}$$

Question 20

A patient with diabetes is found to have elevated levels of ketone bodies in their blood. Which class of biomolecules is being metabolized at an increased rate in this patient?

Accepted Answer

Fatty acids

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