Question

When determining whether a chemical reaction has taken place you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place? es -) A) Solid melts. B) Heat is given off. Substance dissolves D) Substance changes shape. Physical Science​

Answer 1

Answer:

B) Heat is given off.

Explanation:

When heat is given off, a chemical change must have occurred and such a reaction is termed an exothermic reaction.

A chemical change is one in which;

• the process is not easily reversible
• leads to the production of new kinds of matter
• involves change in mass
• requires a considerable amount of energy.

Most chemical reactions are accompanied by heat changes.