when a chemical reaction occurs, chemical bonds break and new chemical bonds form to create the

a) reactant

b) product

Explanation:

During a chemical reaction, the reactants interact among themselves in a specific temperature, pressure, pH, enzyme etc. Due to various intra and inter molecular and atomic interactions, the chemical bonds in the reactants break down. Formation of new chemical product is governed by the formation of new bond (ionic, covalent, hydrogen vander waal etc. )

a and c

c is 100% but i am confused in a

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers