Question

Giving one example of each kind,show that a change in energy takes place when a physical or chemical change occurs

Answer 1

Explanation:

Physical reaction that causes change in energy is

Melting of ice : Ice is in solid form and we know that solid molecules are closely packed and possess less kinetic energy. So, to convert it to liquid, we give it heat. Molecules convert this heat into kinetic energy for movement and convert to liquid

Chemical reaction that causes change in energy is

Simplest example is the dissolution of NACL in water.

When NACL is dissolved in water energy is absorbed by the reaction and the solution may feel cooler than normal water.

Answer 2

Explanation:

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