Question 1

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the transfer of electrons from one atom to another, resulting in oppositely charged ions.

Question 2

Which property of water allows it to moderate Earth's climate by absorbing heat without a large change in temperature?

Accepted Answer

High specific heat capacity

Question 3

A molecule of methane ($$CH_4) $$has which type of covalent bonds?

Accepted Answer

Nonpolar covalent bonds

Question 4

Which of the following is a consequence of water's ability to form hydrogen bonds?

Accepted Answer

Water is a good solvent for polar substances.

Question 5

If the atomic number of carbon is 6, how many electrons does a neutral carbon atom have?

Accepted Answer

6

Question 6

Which of the following best explains why ice floats on water?

Accepted Answer

Hydrogen bonds in ice create a lattice structure that is less dense than liquid water.

Question 7

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

Accepted Answer

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

Question 8

Which of the following elements is most likely to form four covalent bonds?

Accepted Answer

Carbon

Question 9

A solution has a $$[H^+]$$ concentration of $$1 	imes 10$$^{-7}$$ M. What is its pH?

Accepted Answer

7

Question 10

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

Accepted Answer

A substance that minimizes changes in pH by accepting or donating hydrogen ions.

Question 11

Which of the following is NOT a property of water that is important for life?

Accepted Answer

Water forms strong ionic bonds with other molecules.

Question 12

Which of the following statements about valence electrons is correct?

Accepted Answer

Valence electrons determine the chemical reactivity of an atom.

Question 13

Which of the following molecules is most likely to be hydrophobic?

Accepted Answer

Methane ($$CH_4)$$

Question 14

Which of the following best explains why water has a high surface tension?

Accepted Answer

Hydrogen bonds between water molecules create a cohesive force at the surface.

Question 15

Which of the following is the correct order of strength for chemical bonds from strongest to weakest?

Accepted Answer

Covalent \u003e Ionic \u003e Hydrogen

Question 16

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

Accepted Answer

The bicarbonate buffer system in blood

Question 17

Which of the following best describes the difference between a polar and a nonpolar covalent bond?

Accepted Answer

Polar covalent bonds involve unequal sharing of electrons, while nonpolar covalent bonds involve equal sharing.

Question 18

Which of the following elements is most likely to form hydrogen bonds with water?

Accepted Answer

Oxygen

Question 19

Which of the following is the correct formula for calculating the molarity of a solution?

Accepted Answer

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

Question 20

A patient’s blood pH drops from 7.4 to 7.1. Which of the following best describes this change?

Accepted Answer

The blood has become more acidic.

Chemistry of Life: Learning Outcomes and Key Concepts

Study Guide - Practice Questions