Some reactions are exothermic and some reactions are endothermic - Edexcel - GCSE Chemistry - Question 4 - 2022 - Paper 1
Question 4
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... show full transcript
Worked Solution & Example Answer:Some reactions are exothermic and some reactions are endothermic - Edexcel - GCSE Chemistry - Question 4 - 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. This is the only correct option among the choices A, B, C, and D.
Step 2
Give the letter of the piece of apparatus, A, B, C or D, in Figure 6 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, which is a thermometer.
Step 3
Give the name of the piece of apparatus B shown in Figure 6.
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Answer
The piece of apparatus B is a beaker.
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 because it is a good heat insulator. It holds heat in and prevents heat loss, which is advantageous for maintaining the temperature of the mixture.
Step 5
Calculate the change in temperature. Give a sign and a unit in your answer.
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Answer
The change in temperature can be calculated as follows:
