Question

which of the following is a pure substance? check all that apply 1) a solution of an ionic compound 2) milk 3) beer 4) a piece of silver metal 5) a compound formed by metal combining with nonmetal

Explanation:

Step1: Define pure substance

A pure substance has a fixed - composition and distinct chemical properties.

Step2: Analyze each option

• A solution of an ionic compound is a mixture of the ionic compound and a solvent, so it is not a pure substance.
• Milk is a mixture of water, fats, proteins, etc., so it is not a pure substance.
• Beer is a mixture of water, alcohol, hops, etc., so it is not a pure substance.
• A piece of silver metal is an element, and elements are pure substances.
• A compound formed by metal combining with non - metal has a fixed chemical formula and is a pure substance.

Answer:

1. A piece of silver metal
2. A compound formed by metal combining with nonmetal