Question

Write the characteristics of chemical changes.

Answer 1

Chemical changes:

• A permanent change in which the original substance loses its composition and properties and gives rise to one or more new substances with different compositions and properties.
• Examples are the burning of paper, digestion of food, etc.

Characteristics of a chemical change:

• One or more new substances are formed with composition and properties different from the original.
• The change is permanent and irreversible.
• An energy change is generally involved in a chemical change.
• Energy is either absorbed(endothermic change) or evolved(exothermic change) during a chemical change.
• Mass is neither created nor destroyed during a chemical change (law of conservation of mass).