Question

At what temperature is the substance a heated gas?

a) at 100°C
b) below 0°C
c) above 100°C
d) between 0°C and 100°C

Answer 1

A substance, assuming it is water, is a heated gas at temperatures above 100°C, as this is the boiling point where it transitions from a liquid to a gas.

Step-by-step explanation:

To determine at what temperature a substance is a heated gas, we need to understand the melting and boiling points of the substance. Taking water (H₂O) as an example, it has distinct phase changes at specific temperatures. At 0°C, water can exist as both ice and liquid water, which is its melting point. The boiling point of water is 100°C, above which water becomes a gas, known as steam. Therefore, the answer to the question is that a substance, assuming it is water, is a heated gas c) above 100°C. This is because at temperatures higher than 100°C, the liquid phase of water has acquired enough energy to undergo a phase transition into the gaseous state.