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Date November 2016 Marks available 1 Reference code 16N.3.SL.TZ0.2
Level Standard level Paper Paper 3 Time zone 0 - no time zone
Command term Identify Question number 2 Adapted from N/A

Question

An apparatus is used to verify a gas law. The glass jar contains a fixed volume of air. Measurements can be taken using the thermometer and the pressure gauge.

The apparatus is cooled in a freezer and then placed in a water bath so that the temperature of the gas increases slowly. The pressure and temperature of the gas are recorded.

The graph shows the data recorded.

Identify the fundamental SI unit for the gradient of the pressure–temperature graph.

[1]
a.

The experiment is repeated using a different gas in the glass jar. The pressure for both experiments is low and both gases can be considered to be ideal.

(i) Using the axes provided in (a), draw the expected graph for this second experiment.

(ii) Explain the shape and intercept of the graph you drew in (b)(i).

[3]
b.

Markscheme

kg m–1 s–2 K–1

a.

i

any straight line that either goes or would go, if extended, through the origin

 

ii

for ideal gas p is proportional to T / P= nRT/V

gradient is constant /graph is a straight line

line passes through origin / 0,0 

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Core » Topic 1: Measurements and uncertainties » 1.1 – Measurements in physics
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Core » Topic 1: Measurements and uncertainties
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