chapter two review questions

Question 1

If xenon has an atomic number of 54 and a mass number of 108, how many neutrons does it have?

Answer 1

54

Question 2

Atoms that vary in the number of neutrons found in their nuclei are called ________.

Answer 2

Isotopes

Question 3

Potassium has an atomic number of 19. What is its electron configuration?

Answer 3

shells 1, 2 and 3 are full and shell 4 has one electron

Question 4

Which type of bond represents a weak chemical bond?

Answer 4

hydrogen bonding

Question 5

Which of the following statements is not true?
Water is polar.
Water stabilizes temperature.
Water is essential for life.
Water is the most abundant molecule in the Earth’s atmosphere.

Answer 5

Water is the most abundant molecule in the Earth’s atmosphere

Question 6

When acids are added to a solution, the pH should ________.

Answer 6

Decrease

Question 7

We call a molecule that binds up excess hydrogen ions in a solution a(n) ________.

Answer 7

Base

Question 8

Which of the following statements is true?
Acids and bases cannot mix together.
Acids and bases will neutralize each other.
Acids, but not bases, can change the pH of a solution.
Acids donate hydroxide ions (OH–); bases donate hydrogen ions (H+).

Answer 8

Acids and bases will neutralize each other.

Question 9

Each carbon atom can bond with as many as________ other atom(s) or molecule(s).

Answer 9

four