Question

Identify what happens to the temperature of water as it boils?
A) It remains constant
B) It continues to increase as long as heat is applied
C) It increases only if the amount of heat applied is increased
D) Temperature and heat are not related
E) Temperature and heat are related but not the same

Answer 1

By heating, water molecules get energized. When the temperature reaches the boiling point at a constant pressure, the water molecule changes into water vapour. So, the boiling is the process of change of state from liquid to gaseous state.

Complete step by step answer:
Step 1:
The boiling process happens at a constant pressure. The energy given to the molecules changes their state by absorbing the latent heat, hence, the boiling happens at a fixed temperature which is the boiling point.
So, it happens to remain constant as the heat energy is used to change the state of water rather than energizing it further.
Option (A) is correct and hence option (B) and (C) are incorrect.

Step 2:
Temperature and heat are highly related as with the increase in heat the temperature is increased. This option is a bit ambiguous because the statement is more generally refuting a physical fact .
So, option (D) is incorrect.

Step 3:
The third option has a statement which is ambiguous as there is not mentioned what does the same mean in this context. The temperature and heat are two different physical quantities and hence can not be compared in that way.
So, you can discard option (E).
Final Answer:
As water boils for its temperature (A) It remains constant.

Note: The energy supplied is used as latent heat to change the state of water, rather than changing the temperature. By definition the heat causes the change in temperature so temperature and heat are not related and can not be a correct option. The boiling happens at a constant temperature which is called the Boiling point.