What is true of a decomposition reaction?

Question

The reactants are usually a metal and a nonmetal.
The reactants are generally two ionic compounds in an aqueous solution.
The addition of energy in the form of heat or electricity is often required.
Water is usually one of the reactants.

Answer 1

In a decomposition reaction, the key characteristic is that a single compound breaks down into two or more simpler products. Looking at the statements provided:

1. The reactants are usually a metal and a nonmetal. - This statement is not true for decomposition reactions in general. Decomposition reactions can involve a variety of compounds, not limited to metals and nonmetals.

2. The reactants are generally two ionic compounds in an aqueous solution. - This statement is also not true. While some decomposition reactions can occur in aqueous solutions, they often involve a single compound and do not typically consist of two ionic compounds.

3. The addition of energy in the form of heat or electricity is often required. - This statement is true. Many decomposition reactions require energy in the form of heat, light, or electricity to initiate the breakdown of the compound.

4. Water is usually one of the reactants. - This statement is not universally true for decomposition reactions. While some decomposition reactions may involve water, many do not.

In summary, the most accurate statement regarding decomposition reactions is that "the addition of energy in the form of heat or electricity is often required."