Question

A phase change diagram with five sections. The x-axis is thermal energy, and the y-axis is temperature in degrees Celsius. The line in section A goes up and to the right. Section B is a horizontal line at zero degrees, connecting sections A and C. Section C goes from zero to 100 degrees as a diagonal line moving upward and to the right. Section D is a horizontal line at 100 degrees, connecting sections C and E. The line of section E goes up and to the right from 100 to 125 degrees.

In which sections of the diagram does water exist as a liquid?

Select all that apply.

Responses

BB

AA

DD

CC

Answer 1

In the phase change diagram you described, water exists as a liquid in the following sections:

- **Section B**: This is the horizontal line at zero degrees, which corresponds to the phase change from ice (solid) to water (liquid).
- **Section D**: This is the horizontal line at 100 degrees, which corresponds to the phase change from water (liquid) to steam (gas).

Water exists as a liquid during the horizontal phases (B and D), where the temperature remains constant (at the freezing and boiling points), and in the sections where the temperature is within the liquid state range.

Therefore, the sections where water exists as a liquid are:

- **BB** (Section B)
- **CC** (Section C)

**Final selection**: BB and CC.