CHEMISTRY [1 Mark Question Answer]

Whenever there is any physical or chemical change takes place, energy is involved. Either the energy is absorbed or released in one form to other. The changes involve absorption of energy are known as endothermic changes. Example, Cooking of food or melting of ice needs heat energy, therefore, they are endothermic changes.
The changes that involve evolution or release of energy are known as the exothermic changes. Example, burning of match sticks.

A change of state is a physical change in a matter. They are reversible changes and do not involve any changes in the chemical makeup of the matter. Common changes of the state include melting, freezing, sublimation, deposition, condensation, and vaporization.

Examples of chemical changes are burning, cooking, rusting, and rotting.

The chemical composition of the original substance remains the same, even though its physical. properties like colour, state, shape, size etc.

Four Examples of physical changes are boiling water, crushing a can, melting ice, dissolving salt/sugar in water.

A physical change is a temporary change in which no new substance is formed