Question

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

Answer 1

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.

Step-by-step explanation:

hope this helps you.

Answer 2

1. When a solid substance is heated, its temperature will rise until it reaches a critical temperature. At this point, the item won’t melt unless more heat is provided. This additional heat represents energy needed to change the state of the substance from solid to liquid. This energy loosens the ties of molecules, causing them to move faster. When enough heat energy is provided, the substance will change to the liquid state, but the temperature of the substance won’t change. The amount of heat energy required to change a unit of mass from a solid to a liquid without any change of temperature is the latent heat of fusion. If it’s necessary to increase the temperature of a melted substance, additional heat energy must be provided. The latent heat of vaporization is the amount of heat energy required to change a unit of mass of a liquid to a gas without a temperature change.

To condense a gas to a liquid, the gas must be cooled to the condensation point. After condensation, the liquid will have the same temperature as the gas; the temperature is still at the condensation point. To be cooled further, more heat energy should be released.

2. The liquid refrigerant in the indoor coils picks up heat from the indoor air and evaporates. In the gaseous state, it’s pumped to the outdoor coils, where it releases vaporization heat and condenses to the liquid state. The heat is transferred to the outdoor air, and the liquid refrigerant continues to circulate to the indoor coils to repeat the cooling cycle.

3.

Changing from a to a is called and happens at the _______ point.

solid liquid melting melting/fusion

liquid gas evaporation/boiling evaporation/boiling

gas liquid condensation condensation

liquid solid freezing freezing

Step-by-step explanation:

PF