A student uses this apparatus to investigate how the volume of air changes with pressure - Edexcel - GCSE Physics - Question 3 - 2016 - Paper 1
Question 3
A student uses this apparatus to investigate how the volume of air changes with pressure.
He obtains these results and starts to plot a graph.
| Pressure / kPa | V... show full transcript
Worked Solution & Example Answer:A student uses this apparatus to investigate how the volume of air changes with pressure - Edexcel - GCSE Physics - Question 3 - 2016 - Paper 1
Step 1
Transposition
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Answer
To find the new volume, we can start with the equation derived from the ideal gas law:
V2=p2T1p1V1T2
where:
( V_1 ) is the initial volume,
( T_1 ) is the initial temperature in Kelvin,
( p_1 ) is the initial pressure,
( p_2 ) is the new pressure,
( T_2 ) is the new temperature in Kelvin.
Step 2
Substitution
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Answer
Inserting the values into the equation:
V2=78×28398×100×277
Perform the calculation step-by-step and ensure the pressure and temperature values are converted into the correct units.
Step 3
Evaluation
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Answer
Upon evaluating the above expression, the volume results in approximately 123 m³ (or accept 120 m³ by ignoring significant figures).
Step 4
Part iii - Summary of Change
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Answer
B decreases: As the pressure increases, the volume of the trapped air decreases, demonstrating the inverse relationship between pressure and volume according to Boyle's law.
