Question

1. choose the best answer.

when two or more substances combine to make a new substance, a ______ change has occurred.
slow
physical
chemical
fast

1. choose the best answer.

a(n) ______ property depends on the amount of the matter that is present in the sample.
intensive
homogenous
heterogeneous
extensive

Explanation:

• For question 8: A chemical change results in the formation of new substances. A physical change only changes the state or appearance of a substance without forming new substances. The terms "slow" and "fast" describe the rate of a change, not the type.
• For question 9: An extensive property depends on the amount of matter. An intensive property (like density) does not depend on the amount. "Homogenous" and "heterogeneous" describe mixtures, not properties related to the amount of matter.

Answer:

1. chemical
2. extensive