Student name:
DTT Booster
Edexcel Science C2
Final Test – Therapy: Topic 2.5 Energy Change
Question
Topic
Total Marks
1
Exo / Endo
3
2
Graphs
4
3
Size of change
2
4 QWC
Measuring
change
6
My Mark
R
A
G
15
Areas to improve:
Commissioned by The PiXL Club Ltd. February 2016
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Final test: Edexcel Science Topic 2.5 Energy Change (15 marks)
1.
a) Fireworks give off light and heat when they go off; after they go off… (circle the correct answer)
A.
……the remaining chemicals contain less energy
B.
…..the remaining chemicals contain more energy
C.
…..the remaining chemicals contain the same energy
D.
….the remaining chemicals have the same energy arranged differently
b) A chemical reaction involved making and breaking bonds, if a reaction needs more energy to break bonds than is
released making bonds, the reaction….. (circle the correct answer)
A.
…..does not occur
B.
……is exothermic
C.
…..is endothermic
D.
…..is spontaneous
c) The graph shows (circle the correct answer)
A.
A small exothermic change
B.
A large exothermic change
C.
A small endothermic change
D.
A large endothermic change
(3 marks)
2. Reaction A is an explosion; large amounts of heat are released. Reaction B, cools down a test tube of water
by 2OC and reaction C has no temperature change at all.
Complete the graphs to show reactions A, B and C
(4 marks)
1
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3.
Calculate the energy absorbed by 600g of water from a burning fuel if the water started at a temperature of
15oC and finished at 36oC
The specific heat capacity of water is: 4.2 J/g OC
(2 marks)
4. QWC: A student set up an experiment as follows:
Burning 1g of fuel caused the water to change in temperature from 18oC to 34oC.
The specific heat capacity of water is 4.2J/g/ oC
Explain all of the measurements the student must make in order to calculate how much energy is in 1g of the
fuel.
Calculate the energy of the fuel in J/g.
Explain why their value does not match the Theoretical value of 7000 J/g
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2
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