Some reactions are exothermic and some reactions are endothermic - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2022 - Paper 1
Question 2
Some reactions are exothermic and some reactions are endothermic.
(a) What does an exothermic reaction always give out?
A heat energy
B light
C a gas
D sound
(b) I... show full transcript
Worked Solution & Example Answer:Some reactions are exothermic and some reactions are endothermic - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2022 - Paper 1
Step 1
What does an exothermic reaction always give out?
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Answer
An exothermic reaction always gives out heat energy.
Step 2
Give the letter of the piece of apparatus, A, B, C or D, in Figure 3 that is used to measure the temperature.
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Answer
The letter of the piece of apparatus used to measure the temperature is A.
Step 3
Give the name of the piece of apparatus B shown in Figure 3.
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Answer
The piece of apparatus B shown in Figure 3 is a thermometer.
Step 4
State why polystyrene is a better material than glass for this piece of apparatus.
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Answer
Polystyrene is a better material than glass for this piece of apparatus because it is a better insulator, which helps maintain the temperature of the mixture without losing heat to the environment.
Step 5
Calculate the change in temperature.
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The change in temperature can be calculated as follows:
