1. Which statement is not true of a compound?
a. The elements in it are combined chemically.
b. The elements in it have a definite proportion by mass.
c. The elements in it can be separated by physical means.
d. The elements in it can be separated by chemical means.

2. Density is one of the properties of a substance. How is this property classified?
a. physical and intensive
b. physical and extensive
c. chemical and intensive
d. chemical and extensive

3. A mixture is formed when powdered milk is dissolved in hot water. The mixture is cooled and allowed
to stand for several days until a foamy white substance is formed. Which is a chemical change?
a. dissolving of milk
b. cooling of the mixture
c. formation of the mixture
d. formation of the foamy substance​