Question

Which statement describes one of the main differences between a physical and a chemical change? A chemical change involves reactants and products, whereas a physical change involves only reactants. A physical change is a change of state, whereas in a chemical change the substance keeps the same form. A physical change brings about a different form of the same substance, whereas a chemical change forms a different substance. A chemical change caused by adding or removing heat energy can usually be reversed, whereas a physical change can generally not be reversed.

Answer 1

Answer : The correct option is, A physical change brings about a different form of the same substance, whereas a chemical change forms a different substance.

Explanation :

Physical change : It is a change in which the actual composition of the molecule remains same when the molecules are rearranged.

• There is no new substance formed in this change.

• Generally, the physical change is reversible.

• Energy is not produced in the physical change.

Chemical change : It is a change in which the actual composition of the molecule are changed completely when the molecules are rearranged.

• The new substance is formed in this change.

• Generally, the chemical change is irreversible.

• Energy is produced in the chemical change.

Therefore, the correct answer is, A physical change brings about a different form of the same substance, whereas a chemical change forms a different substance.