Multiple Choice
Which of the following best explains why a gas emits light (glows) when an electric current is passed through it in a discharge tube?
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7. Gases
Gas Stoichiometry
Multiple Choice
In the context of gas stoichiometry, to pull a vacuum means to ____.
A
remove most or all of the gas from a container, creating a region of very low pressure
B
add a gas to a container until it reaches atmospheric pressure
C
increase the temperature of a gas to expand its volume
D
compress a gas into a smaller volume at constant temperature
Verified step by step guidance1
Understand the term 'pull a vacuum' in the context of gases: it refers to the process involving pressure changes inside a container.
Recall that pressure is related to the amount of gas particles in a given volume; reducing the number of gas particles lowers the pressure.
Recognize that 'pulling a vacuum' means removing gas molecules from a container, which decreases the pressure significantly below atmospheric pressure.
Compare this with other options: adding gas increases pressure, increasing temperature at constant volume raises pressure, and compressing gas at constant temperature increases pressure by reducing volume.
Conclude that 'pulling a vacuum' specifically means removing most or all gas from a container to create a region of very low pressure.
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