What is the effect of heat and light on chemical reaction​

Exothermic reactions release heat and light into their surroundings. For example, combustion reactions are usually exothermic. In exothermic reactions, the products have less enthalpy than the reactants, and as a result, an exothermic reaction is said to have a negative enthalpy of reaction.

Is it fire onn a bottle?

Explanation:

Because I thought that if you shine light ona ANYTHING plastic, the chemical reaction is a little fire.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error