Q16E - Chemistry (OpenStax)

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

Step-by-Step Solution

Answer

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

Step 1: 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.

Step 2: Classifying the above components into the elements, compounds, or mixture

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