1. Explain how applied heat works between and at critical temperatures. 2. Explain how a refrigerator works to cool down warm objects that would
otherwise be room temperature.
3. Fill in the chart below to identify the name of the process that explains the
state of change indicated, the states of matter being changed, or the points at
which the process occurs.
Changing from a
to a
is called
and happens at the
point.
solid
liquid
liquid
evaporation/boiling
evaporation/boiling
liquid
condensation
solid
freezing

1) Gases become more difficult to liquefy as the temperature increases because the kinetic energies of the particles that make up the gas also increase. The critical temperature of a substance is the temperature at and above which vapor of the substance cannot be liquefied, no matter how much pressure is applied.

2)The compressor constricts the refrigerant vapor, raising its pressure, and pushes it into the coils on the outside of the refrigerator.  When the hot gas in the coils meets the cooler air temperature of the kitchen, it becomes a liquid. The refrigerant absorbs the heat inside the fridge, cooling down the air.

Explanation:

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