Chemical Reactions and Equations T1 (O)

Chemical reactions is a process in which one or more substances react together to form new substances.

• True

• False

Breaking of the chemical bonds and formation of new chemical bonds is responsible for the occurrence of a chemical reaction.

• True

• False

The substances which take part in a chemical reaction are called as

• Reactants

• Products

• Both Reactants and Products

• None of the above

The substances which are formed in a chemical reaction are called

• Reactants

• Products

Which of the following is not a chemical reaction?

• Digestion of food

• Respiration

• Dissolution of salt in water

• None

A chemical equation is the shorthand notation of the chemical reaction in terms of symbol, formulae and the ratio of number of various reactants and products involved.

• True

• False

In balanced chemical equation number of atoms of each element on reactant side is not equal to that on product side.

• True

• False

Which of the following determines the occurrence of a chemical reaction?

• Change in state

• Change in colour

• Change in temperature

• All of the above

A balanced equation is a equation in which atoms of various elements on both sides
of a chemical equation are equal in accordance with the law of conservation of mass.

• True

• False

Which of the following is not a physical change?

• Boiling of water to give water vapour

• Melting of ice to give water

• Dissolution of salt in water

• Combustion of liquified petroleum gas (LPG)