Question

If you start with substance A and substance B, combine them together,

and produce a new substance C, you have witnessed a

Answer 1

Chemical change

Step-by-step explanation:

If you start with substance A and B and you produce C, you have witnessed a chemical change and this is a synthesis or combination reaction.

A + B → C

We know this because from the two different reactants, a new substance C has been formed.

The substance C is produced via a chemical change.

In a chemical change, new kinds of products are usually formed and the reaction is not easily reversible.