Question

Which of the following is a mixture?

Carbon dioxide
Iron
Sugar
Sand

Answer 1

Sand

Explanation:

Carbon dioxide is made up of the compound `CO_2`

Iron is made up of the element Iron unless oxidised where it would then contain iron oxide

Sugar or sucrose is considered a disaccharide and is made up of fructose and glucose combined together as 1 molecule

Sand is considered a mixture because it contains a combination of silicates, chlorides, sulphates and nitrates. It is usually said that this combination is heterogenous meaning the mixture is not the same throughout.

Answer 2

Sand is a mixture of the elements silicon, oxygen and some particles..

Explanation:

Sand can also be a compound since it has the formula `SiO_2` which is Silica Oxide..

For the rest;

Carbon dioxide, is a compound, `CO_2`

Iron, is an element, `Fe`

Sugar, is a complex compound, `C_12H_22O_11`