Question

An example of a pure substance is ____.

a) an element
b) a compound
c) H2O
d) carbon dioxide
e) all of these

Answer 1

Answer: e) all of these

Step-by-step explanation:

Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Copper

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water
`(H_2O)`, carbon dioxide
`(CO_2)`

Mixtures are not pure substances as they consist of elements and compounds combined physically and not in any fixed ratio. Example: Air

Thus all given substances are pure substances.