Define compound, diatomic element, and electrolysis. Identify diagrams representing element, compound, mixture, and diatomic element. Discuss copper chloride decomposition.

1. Define each of the following terms.

1.1 A compound is a substance formed when two or more different chemical elements are chemically bonded together in a fixed ratio.

1.2 A diatomic element is an element whose stable form consists of molecules made up of two atoms of the same element.

1.3 Electrolysis is the process of using electrical energy to drive a non-spontaneous chemical reaction, typically to decompose a compound into its constituent elements or simpler compounds.

2. Choose the letter(s) of the diagram(s) that best fit(s) each description below.

2.1 Element: C (monatomic element)

2.2 Compound: D

2.3 Mixture: B

2.4 Diatomic element: A

2.5 Hydrogen gas: A

2.6 Neon gas: C

2.7 Can be separated by physical means: B

2.8 Can be separated by a chemical reaction: D

3. Consider the decomposition of copper chloride solution.

3.1 Copper chloride is a compound.

3.2 Decomposition is a chemical reaction in which a single compound breaks down into two or more simpler substances, which can be elements or simpler compounds.

3.3 The type of decomposition used in this reaction is electrolysis (or electrolytic decomposition).

3.4 The two substances formed when copper chloride is decomposed are copper and chlorine.