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This graph shows the phase change for water.



Which statement best describes what is happening at portion C?

(1 point)
Responses

The energy is increasing, and temperature is also increasing.
The energy is increasing, and temperature is also increasing.

The temperature is increasing, but the energy stays the same.
The temperature is increasing, but the energy stays the same.

The energy is increasing, but the temperature stays the same.
The energy is increasing, but the temperature stays the same.

Both Energy and temperature remain the same.
Both Energy and temperature remain the same.

1 answer

To accurately determine what is happening at portion C of the phase change graph for water, we need to consider the different phases of water and how energy and temperature behave during phase changes:

  1. When water is heated in the liquid phase (between melting and boiling point), the temperature increases as energy is added.
  2. At the melting and boiling points, energy is added, but the temperature remains constant while the phase is changing (from solid to liquid or liquid to gas).
  3. Once the phase change is complete and the substance is in the next phase (either liquid or gas), the temperature will increase again with added energy.

Without seeing the actual graph but based on the typical representations of phase change graphs, if portion C refers to the phase change from liquid to gas (boiling), it would be where the temperature remains constant as the energy is added to convert the liquid to gas.

Thus, if portion C refers to the boiling point where water is turning from liquid to gas, the correct statement would be:

The energy is increasing, but the temperature stays the same.