In which two types of reactions do opposite chemical changes occur?

A.) double replacement and combustion

B.) single replacement and double replacement

C.) synthesis and decomposition

D.) combustion and synthesis

synthesis and decomposition

Explanation:

1. A double displacement reaction is one in which exchange of ions take place.

2. Combustion is a type of chemical reaction in which hydrocarbons burn in the presence of oxygen to form carbon dioxide and water along with heat.

3. A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.

4. Synthesis is a type of chemical reaction when two reactants combine to give a single product.

5. Decomposition reaction is a type of chemical reaction in which one reactant gives two or more than two products.

neutrons are in the middle of the atom and the electrons, which are much smaller.