Question

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

Answer 1

Answer: synthesis and decomposition

Explanation:

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

$XY+PQ\rightarrow XQ+PY$

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.

$XY+\rightarrow XZ+Y$

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

$A+B\rightarrow C$

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

$C\rightarrow A+B$