Question 1

Which of the following statements best describes an isotope?

Accepted Answer

An atom with a different number of neutrons than other atoms of the same element.

Question 2

What is the atomic number of an atom with 6 protons, 6 neutrons, and 6 electrons?

Accepted Answer

6

Question 3

Which type of chemical bond is the strongest?

Accepted Answer

Covalent bond

Question 4

A sodium atom loses one electron to become a sodium ion. What is the charge of the resulting ion?

Accepted Answer

Positive

Question 5

Which property of water allows insects to walk on its surface?

Accepted Answer

Surface tension

Question 6

What is the molecular formula for glucose?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Question 7

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

Accepted Answer

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

Question 8

A solution has a pH of 4. How many times more acidic is it than a solution with a pH of 6?

Accepted Answer

100 times

Question 9

Which of the following molecules is held together by polar covalent bonds?

Accepted Answer

H$$_2O$$

Question 10

Which statement about acids and bases is correct?

Accepted Answer

Bases increase the concentration of OH$$^-$$ ions in solution.

Question 11

Which of the following is a compound?

Accepted Answer

CO$$_2$$

Question 12

What is the mass number of a carbon atom with 6 protons and 8 neutrons?

Accepted Answer

14

Question 13

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak bond between a hydrogen atom with a partial positive charge and an electronegative atom.

Question 14

Which element is most likely to be nonreactive due to a full valence shell?

Accepted Answer

Neon

Question 15

If a molecule is hydrophilic, what type of substances will it most likely dissolve in?

Accepted Answer

Ionic and polar solvents

Question 16

Which property of water is most important for temperature regulation in living organisms?

Accepted Answer

High heat of vaporization

Question 17

Which of the following best describes the difference between a molecule and a compound?

Accepted Answer

A molecule is a stable particle composed of two or more atoms, while a compound is composed of two or more different elements in a fixed ratio.

Question 18

Which of the following is true about the electron configuration of hydrogen?

Accepted Answer

Hydrogen can fill its valence shell by sharing an electron with another atom.

Question 19

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

Accepted Answer

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

Question 20

A solution has a pH of 8. Which of the following best describes this solution?

Accepted Answer

It is basic.

Chapter 2: The Chemical Context of Life – Atoms, Molecules, and Water

Study Guide - Practice Questions