Question

An experiment applies heat to a substance and produces a gas that is a new and different substance. Choose the true statement.

a. This represents a physical change only.
b. This represents a chemical change only.
c. This represents both a physical and a chemical change.
d. This represents neither a physical change nor a chemical change.

Answer 1

Well if the change is reversible then it is a physical change, but if not then it is a chemical change.