Question

Classify each of the following as an element, a compound, or a mixture:

1. Copper
2. Water
3. Nitrogen
4. Sulphur
5. Air
6. Sucrose
7. a substance composed of molecules each of which contains two iodine atoms
8. gasoline

Short answer

(a) element (b) compound (c) element (d) element (e) mixture (f) compound (g) element (h) mixture

Step-by-step solution

Defining the element, compound, and mixture

An element is a pure substance that cannot be broken into simpler substances by chemical reaction.

A compound is defined as a substance divided into atoms, molecules, or ions by any chemical process.

A mixture is a combination of two or more substances which can be separated by physical process.

Classifying the above components into the elements, compounds, or mixture

1. Copper is an element.
2. Water is acompound.
3. Nitrogen is anelement.
4. Sulfur is anelement.
5. Air is amixture.
6. Sucrose is acompound.
7. A substance composed of molecules, each containing two iodine atoms, isan element.
8. Gasoline is amixture.