Question

Evaporating water is an example of a physical change because (2 points) Question 7 options: 1) bonds are broken and atoms are rearranged. 2) the atoms are pulled apart to form a new substance. 3) it does not involve intermolecular forces or particle motion. 4) the identity of the substance does not change.

Answer 1

Answer : The correct option is, 4) the identity of the substance does not change.

Explanation :

Chemical change : It is a change where changes occurs in the chemical composition and thus resulting in the formation of new compound or substance. It is usually an irreversible reaction.

Physical change : It is a change in which shape and size of a substance changes. In this there is no change in the chemical composition of the substance and no new substance is forming. It is usually an reversible reaction.

As we know that evaporation is a process in which the phases changes from liquid state to gaseous state at constant temperature.

`H_2O(l)\rightarrow H_2O(g)`

As per question, when water evaporates, the liquid water changes to gaseous form then the identity of the substance does not change. This is a physical change because only phase changes.

Hence, the evaporating water is an example of a physical change because the identity of the substance does not change.

Answer 2

Answer: 4) the identity of the substance does not change.

Explanation: Chemical change is defined as the change in which a change is the chemical composition takes place resulting in the formation of new substance. It is usually an irreversible reaction.

Physical change is defined as the change in which shape and size of a substance changes, There is no change in the composition of the substance as no new substance is forming. It is usually an reversible reaction.

When a liquid evaporates, the liquid water changes to gaseous form and thus the identity of the substance does not change.

`H_2O(l)\rightarrow H_2O(g)`