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Edexcel | Physics WPH0 | W 11 6 1 | 1 hour 15 minutes
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4
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You are to plan an experiment to investigate the rate of cooling of cooking oil. You are

then to analyse a set of data from such an experiment.

4
(a)
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5 Mark s

You are provided with a thermometer and a stop clock to record temperature and

time. You also have access to all usual laboratory apparatus.

A liquid loses heat at a rate proportional to its temperature difference above its

Describe the measurements you would make to verify this relationship. Your

description should include:

  •           a variable you will control to make it a fair investigation
  •            how you will make your results as accurate as possible

Control variable (1)

e.g. room temperature, no draughts, exclude sunlight

Measure temperature of oil as it cools (1)

Good method

e.g. specified time interval, starting temp at least 70 ºC (1)

Measure room temperature (1)

Sensible precaution (1)

e.g. stir liquid as temperature falls, keep thermometer away

from sides and base, eye level with thermometer reading

4
(b)
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The following data were obtained using cooking oil. 

Room temperature = 22 °C

4
(b) (I)
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1 Mark

ln Δθ = -kt + ln Δθ0

and compare with y = mx + c / states gradient is –k

4
(b) (II)
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5 Mark s

Use the column(s) provided for your processed data, and then plot a suitable graph

Δθ & ln Δθ correct and ln Δθ to at least 3 SF 

Sensible scale for graph (allow ’60 s’ here) 

Axes labelled with quantities and units

Plots accurate 

Best fit line

4
(b) (III)
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3 Mark s

Use your graph to determine a value of the constant k for the oil.

k =

Gradient found using large triangle (base > 5 cm)

0.0027 > gradient > 0.0031 and negative 

0.0027 > k > 0.0031 with unit s-1 [seen anywhere]

4
(c)
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1 Mark

Your teacher suggests using a temperature sensor and a data logger in place of the

thermometer and stop clock.

State an advantage of using a temperature sensor and a data logger in this

experiment

Takes simultaneous readings/plots graph automatically

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