Question

In which type of chemical reaction do two or more substances combine to form one substance?

Answer 1

the answer is
synthesis

Answer 2

Step-by-step explanation:

A reaction in which two or more substances combine together to form a single product is known as synthesis reaction.

For example,
`C + O_(2) \rightarrow CO_(2)`

or,
`H_(2) + (1)/(2)O_(2) \rightarrow H_(2)O`

During synthesis reaction, heat or light are released in the form of energy. Therefore, synthesis reactions are exothermic in nature.