EVERYDAY SCIENCE

Detailed explanation-1: -In fact, burning of any substance is a chemical change. Burning is always accompanied by production of heat. Explosion of a firework is a chemical change.

Detailed explanation-2: -The fuel, usually hydrocarbons, uses up oxygen from its surroundings and forms carbon dioxide and water. The water produced evaporates as water vapour as soon as it is formed due to the high temperature of the flame. Since a chemical reaction takes place, thus, we can say that burning is always a chemical change.

Detailed explanation-3: -The statement is true. The process of combustion or burning produces a substance with a new identity; for example, when a piece of wood is burned, it turns into smoke and ashes. Therefore, it is a chemical change.

Detailed explanation-4: -Answer and Explanation: Burning is a chemical reaction as it results in a chemical compound with distinct chemical properties than the reacting substances. During burning, a substance combines with oxygen and results in a different chemical compound. The reaction is accompanied by release of heat and light.

Detailed explanation-5: -As we burn a paper, it changes to ash i.e. changes its chemical composition, hence, it is a chemical change.