Question

A phase change diagram with five sections. The x-axis is time, and the y-axis is temperature in degrees Celsius. Line A in the first section starts at 125 degrees and goes down and to the right until it reaches 100 degrees. The second section (line B) is a horizontal line at 100 degrees extending to the right for a while. The third section (Line C) goes from 100 to zero degrees as a diagonal line moving downward and to the right. The fourth section (Line D) continues to the right for a while as a horizontal line at zero degrees. The line of the fifth section (Line E) goes down and to the right from zero to minus 25 degrees.What change is happening in Section B?

Responses

Water vapor is becoming liquid water.Water vapor is becoming liquid water.

The temperature of water vapor is decreasing.The temperature of water vapor is decreasing.

The temperature of liquid water is decreasing.The temperature of liquid water is decreasing.

Liquid water is becoming ice.Liquid water is becoming ice.
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Answer 1

In Section B of the phase change diagram, where line B is a horizontal line at 100 degrees Celsius, the temperature of the substance remains constant while it is undergoing a phase change. Since this section follows a cooling period (Section A) and is characterized by the temperature staying at 100 degrees Celsius, it indicates that water vapor is condensing into liquid water.

So the correct response is:
**Water vapor is becoming liquid water.**