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GCSE Questions: Kinetic Theory - Gases

Q3. Ringo used the equipment shown in the diiagram to investigate how the pressure of a gas varies with the volume of the gas.

The syringe is filled with air.

Here is a table of the results:

Volume /cm3
Pressure /kPa
24
100
20
120
12
200
10
240

 

(a) Describe how Ringo could have used the equipment shown above to obtain the data shown in the table.

[4 marks]

This type of question is marked in two ways:

- the examiner looks for relevant points

- but also for a logical sequence...

It is not just a 'tick fest' - but a marker does look to see how many relevant points you have made, then considers how you have strung them together to put your answer into a 'level'

Level 2:

The method would lead to the production of a valid outcome. Key steps are identified and logically sequenced.

3 - 4 marks
Level 1:

The method would not necessarily lead to a valid outcome. Some relevant steps are identified, but links are not made clear.
1 - 2 marks
Level 0:

No relevant content
0 marks

 

Indicative content:

record the initial volume of air

record the initial pressure

push the plunger of the syringe • to decrease the volume of air

read the new value on the pressure gauge

record the new value of the volume

repeat for different volumes

(b) Describe what happens to the pressure of the air when the volume of the air is halved.

When the volume is halved the pressure increases to double the value.

[2 marks]

(c) The temperature of the air in the syringe remained constant during Ringo's investigation.

Tick two properties of the air particles listed in the table below that would change if the temperature increased.

kinetic energy
mass  
shape  
speed
volume  

[2 marks]

[8 Marks TOTAL]