TASK 4.Write E if it describes an element and C if it describes a compound

1. A substance that contains only one kind of atom.

2.It cannot be separated by physical or chemical means.

3.A substance containing two or more elements chemically bonded together

4.Carbon dioxide is an example.

5.Carbon is an example.

please answer it correctly, if you didn't know the answer don't answer nonsense because it doesn't help me, if you know the answer please can you help me​