Physics · Oct / Nov 2020 · Paper 62 · Question 4
0625
As printed in the paper
The question as text
A student investigates the length of time taken for ice cubes to melt when they are placed in water. She uses beakers of water at different temperatures to investigate how the initial temperature of the water affects the time taken for the ice cubes to melt. Plan an experiment to investigate how the initial temperature of the water affects the time taken fo The following apparatus is available: thermometer supply of ice cubes 250 cm3 beakers supply of cold water In your plan, you should: • write a list of additional apparatus to use • explain how to carry out the investigation • state the key variables to keep constant • draw a table, or tables, with column headings, to show how to display the readings (you are n required to enter any readings in the table) • explain how to use the readings to reach a conclusion.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
Apparatus:
MP1 method of heating water and timer
MP2 method: measure the temperature of the water and then place the ice cube(s) in the water and measure the time taken to melt
MP3 method: melt
repeat with water at different temperature(s)
Key variables:
Any two from:
MP4
mass / volume of ice cubes
MP5
number / size of ice cubes (per test)
temperature of ice cubes / keep ice cubes in freezer
volume / amount of water in the beaker
room temperature
amount of stirring
Table:
MP6
table with columns for time / t and water temperature with correct units
Conclusion:
MP7
explanation of how to reach a conclusion
Additional graph notes:
Note: The principle to apply here is ‘could I draw a significantly better line, using these points, under examination conditions?’ If the answer is definitely ‘yes’, do not award the mark.
Note: If candidate’s scale consists of actual readings at equal intervals this will produce a perfect straight line! The only mark available in this case is the first (axes right way round and labelled) So maximum 1.
If axes are wrong way round, the other 3 marks are still available.
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