6.  What law predicts the outcome of question 5?

a) Law of definite proportions

b) Law of gravity

c) Law of Conservative Mass

d) Law of Conservation of Mass

7.  What type of bond occurs when two atoms share electrons?

a) Ionic

b) Covalent

c) Metallic

d) Permanent

8.  Which one of the following observations provides certain evidence that a chemical change has occurred?

a) A change of state takes place.

b) A new substance is formed.

c) There is a change in volume.

d) Heat is not given off.

9. Which of the following statements about the particles in a piece of silver is incorrect?

a) All of the particles have the same number of protons.

b) The particles are always moving.

c) There are strong forces of attraction between the particles.

d) Some particles have different numbers of protons.

10.  When a negative ion is formed, an atom must:

a) lose an electron

b) lose a proton

c) gain an electron

d) gain a proton