Multiple Choice
An 80 g sample of oxygen gas (O_2) was heated from 25°C to 225°C at constant pressure. Using the ideal gas law, what happens to the volume of the gas?
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7. Gases
The Ideal Gas Law
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In a refrigeration system, what is the physical state of the refrigerant as it enters the compressor?
A
Low-pressure vapor
B
High-pressure vapor
C
High-pressure liquid
D
Low-pressure liquid
Verified step by step guidance1
Understand the role of the compressor in a refrigeration cycle: it compresses the refrigerant vapor, increasing its pressure and temperature.
Recall that before entering the compressor, the refrigerant must be in a vapor state because compressors are designed to compress gases, not liquids.
Identify that the refrigerant leaving the evaporator is at low pressure and low temperature, and it enters the compressor as a low-pressure vapor.
Recognize that the refrigerant cannot be a liquid at this point because compressing a liquid would damage the compressor and is not part of the refrigeration cycle.
Conclude that the physical state of the refrigerant entering the compressor is low-pressure vapor.
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