COMBINED SCIENCE: TRILOGY - AQA
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GCSE COMBINED SCIENCE: TRILOGY
Higher Tier Chemistry Paper 2H
H
Wednesday 10 June 2020 Morning Time allowed: 1 hour 15 minutes
Materials
For this paper you must have: ? a ruler ? a scientific calculator ? the periodic table (enclosed).
Instructions
? Use black ink or black ball-point pen. ? Pencil should only be used for drawing. ? Fill in the boxes at the top of this page. ? Answer all questions in the spaces provided. ? If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s). ? Do all rough work in this book. Cross through any work you do not want to be
marked. ? In all calculations, show clearly how you work out your answer.
For Examiner's Use
Question 1 2 3 4 5 6 7
TOTAL
Mark
Information
? The maximum mark for this paper is 70. ? The marks for questions are shown in brackets. ? You are expected to use a calculator where appropriate. ? You are reminded of the need for good English and clear presentation in your answers.
*jun208464c2h01*
IB/M/Jun20/E10
8464/C/2H
2
0 1
This question is about the Earth's resources.
When most fuels burn carbon dioxide is produced. Propane (C3H8) is a fuel.
0 1 . 1 Balance the equation for the combustion of propane.
C3H8 +
O2 3 CO2 + 4 H2O
Do not write outside the
box
[1 mark]
0 1.2
Describe the test for carbon dioxide. Give the result of the test.
Test Result
[2 marks]
0 1 . 3 Propane can be cracked to produce propene and hydrogen. Complete the symbol equation for the reaction.
[1 mark]
C3H8
propane
propene
+ H2
hydrogen
*02*
IB/M/Jun20/8464/C/2H
3
0 1.4
Describe the test for hydrogen. Give the result of the test.
Test Result
0 1.5
Propene is an alkene. Describe the test for alkenes.
Give the colour change in the test.
Test
Colour change
to
Turn over for the next question
Do not write outside the
box
[2 marks]
[3 marks] 9
*03*
Turn over
IB/M/Jun20/8464/C/2H
0 2
4 Some students investigated the effect of temperature on the rate of reaction.
Do not write outside the
box
0 2 . 1 The students reacted sodium thiosulfate solution with hydrochloric acid.
This is the method used.
1. Use a beaker to measure 50 cm3 of heated sodium thiosulfate solution into a conical flask.
2. Measure the temperature of the room.
3. Put the conical flask on a black cross drawn on a piece of paper.
4. Start a timer. 5. Use the same beaker to measure 10 cm3 of hydrochloric acid into the conical flask.
6. Stop the timer when the cross is no longer visible.
The students repeated the experiment at a different room temperature. Figure 1 shows the apparatus.
Figure 1
*04*
IB/M/Jun20/8464/C/2H
5
The method contains errors and does not produce accurate results. Describe a method the students should use to produce accurate results. You do not need to write about safety precautions.
Do not write outside the
box
[6 marks]
*05*
Question 2 continues on the next page
Turn over
IB/M/Jun20/8464/C/2H
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