Question

The gas in the piston is being heated, and the piston has moved upward. The observation will be summarized in a row of the incomplete table below.
Row : 1, 2, 3, 4
Name:Boyle's law, Charles’s law, Gay- lussac's law, Combined gas law
Observation: Volume increases when pressure decreases, ?, ?, ?
Variables: ?, ?,Temperature, pressure, ?

What are the variables for this piston?

1. temperature only
2. temperature and volume
3. pressure and number of molecules
4. volume and number of molecules

Answer 1

Given that the gas is enclosed you know that the number of moles does not change.

Assuming that the piston moves freely, you infere the pressure is constant.

The voume is evidently variable.

Temperature tends to decrease when the gases expands.

Therefore, there are two variables: the volumen and the temperature.

Answser: option 2: temperature and volume.

Answer 2

Answer:

2. temperature and volume

Explanation:

Hello,

In this case, it is seen that due to the effect of the temperature increase, the temperature is considered as a variable since it is modifying the piston's states. In addition, as long as the piston moved upward owing to the aforesaid temperature increase, the volume is considered as the other variable by cause of its change (when the piston moves upwards the volume increase). In such a way, there are two variables, temperature and volume. Neither pressure nor number of molecules are variable since the piston is a closed system and the piston's movement allows the pressure to keep constant.

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