CHAPTER 2

1) ______ is an example of an element.

A) Carbon

2) The four most common elements found in living things are

A) carbon, oxygen, nitrogen, and hydrogen.

3) Which of the following elements, essential to life, is a trace element?

A) iodine

9) In the following reaction, what type of bond is holding the two atoms together?

A) ionic

12) A base ______.

A) removes H+ ions from a solution

11) Sugar dissolves when stirred into water. The sugar is the ______, the water is the ______, and the sweetened water is the ______.

A) solute... solvent... solution

8) The bond between oppositely charged ions is a(n) ______ bond.

B) ionic

4) An atom with a positive charge has ______.

B) more protons than electrons

7) Isotopes of an element have the same number of ______ and different numbers of ______.

B) protons... neutrons

10) The tendency of molecules of the same kind to stick together is called ______.

C) cohesion

5) An atom's ______ are found in its nucleus.

C) neutrons and protons

6) All atoms of an element have the same number of ______.

D) protons