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Heat Questions - GCSE Level

Q18. Hermione investigated the insulating properties of newspaper.

(a) The diagram shows the apparatus she used.

 

Her results are shown in the graph below:

Describe a method the student could have used to obtain the results shown in this graph.

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 3:

The design/plan would lead to the production of a valid outcome.

All key steps are identified and logically sequenced.

Workable method which includes changing the number of layers and includes at least one control variable (same volume of water or same starting temperature)

5 - 6 marks
Level 2:

The design/plan would not necessarily lead to a valid outcome.

Most steps are identified, but the plan is not fully logically sequenced.
3 - 4 marks
Level 1:

The design/plan would not lead to a valid outcome.

Some relevant steps are identified, but links are not made clear.
1 - 2 marks
Level 0:

No relevant information
0 marks

 

Examples of physics points that should be made in the response:

Wrap N layers of newspaper around the metal can

Heat water in a kettle or using a Bunsen burner

Put hot water in the metal can

Use a measuring cylinder to measure the volume of water

Measure initial and final temperature with the digital thermometer

Use a stopclock / stopwatch to measure a time of 5 minutes

Calculate temperature decrease

Repeat with different number of layers of newspaper

Repeat with no layers of newspaper

Use same initial temperature of hot water

Use same volume of water each time

[6 marks]

(b) Hermione could have used a datalogger with a temperature probe instead of the digital thermometer.

This diagram shows the readings on the digital thermometer and the datalogger.

The datalogger records 10 readings every second. Hermione had considered using a temperature probe and datalogger, but decided not to. Explain why it was not necessary to use a temperature probe and datalogger for this investigation.

The digital thermometer and the datalogger both have the same resolution

Hermione only needed to measure the start and end temperature or only need two readings or only need to calculate the temperature change

[2 marks]

(8 marks total)