Question

1. Give an example of a chemical change which is accompanied by the evolution of heat light and sound energy.

2. The substance which loses electrons is said to be______ whereas the one which gains electrons is said to be_____

Answer 1

Example of reaction that produces light sound and heat is sodium with water. This produce sodium hydroxide (NaOH) and H2
H2 undergoes combustion due to heat from reaction producing light and sound.

Substance that loses electrons is called Reducing agent and that gains electrons is called oxidising agent