Question

reactions in which two or more substances combine to form a new substance are referred to as reactions.

Explanation:

In chemistry, a combination reaction (also known as a synthesis reaction) is defined as a reaction where two or more substances (which can be elements or compounds) combine to form a single new substance. For example, \(2H_{2}+O_{2}\xrightarrow{\text{点燃}}2H_{2}O\) is a combination reaction where hydrogen and oxygen (two substances) combine to form water (a new substance).

Answer:

combination