Question

Which is not a compound?


sugar
water
silicon dioxide
gold

Answer 1

Gold is not a compound it is a element

Answer 2

Answer: gold

Step-by-step explanation:

Element is a pure substance which is composed of atoms of similar elements. Example: Argon with atomic symbol
`Ar`

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

Example: Water with formula
`H_2O` and contains hydrogen and oxygen in a fixed ratio by mass

1. Sugar has chemical formula of [texC_{12}H_{22}O_{11}[/tex] and thus is a compound.

2. Water has chemical formula of
`H_(2)O` and thus is a compound.

3. Silicon dioxide has chemical formula of
`SiO_2` and thus is a compound.

4. Gold has chemical formula of
`Au` and thus is an element.