Question

Which two substances can not be broken down by chemical change?

a) Elements and compounds
b) Compounds and mixtures
c) Mixtures and solutions
d) Elements and solutions

Answer 1

Elements and compounds are both examples of pure substances. A substance that cannot be broken down into chemically simpler components is an element. A substance that can be broken down into chemically simpler components (because it has more than one element) is a compound.

Step-by-step explanation:

Elements and compounds are both examples of pure substances. A substance that cannot be broken down into chemically simpler components is an element. Aluminum, which is used in soda cans, is an element. A substance that can be broken down into chemically simpler components (because it has more than one element) is a compound. For example, water is a compound composed of the elements hydrogen and oxygen.