PLEASE HELP I BEG YOU I REALY NEED HELP

When the characteristics or state (solid, liquid or gas) of a substance change but the chemical composition does not change that is an indication of:

a physical change
a chemical change
a global change
no change

Which of the following is an extensive physical property of matter?

volume
viscosity
odor
density

The percentage by mass of elements in a particular pure substance will vary from sample to sample.

True
False

Classify each of the following as an element, compound, or mixture.

mixture

compound

element

Answer
A.
propane gas
B.
soil (dirt)
C.
solid gold coin