Students are investigating exothermic and endothermic reactions - Edexcel - GCSE Chemistry - Question 1 - 2018 - Paper 1
Question 1
Students are investigating exothermic and endothermic reactions.
They are finding the temperature change in 50 cm³ water when a solid dissolves in it.
The apparatus ... show full transcript
Worked Solution & Example Answer:Students are investigating exothermic and endothermic reactions - Edexcel - GCSE Chemistry - Question 1 - 2018 - Paper 1
Step 1
P: pour the 50 cm³ water into the polystyrene cup
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Answer
Start by pouring the 50 cm³ of water into the polystyrene cup. This is crucial as the cup is designed to minimize heat loss.
Step 2
Q: add the solid to the water and stir
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Next, add the solid substance to the water and stir continuously to ensure proper dissolution and even distribution of heat.
Step 3
R: measure the initial temperature of the water
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Before adding the solid, measure and record the initial temperature of the water using the thermometer.
Step 4
T: measure the final temperature of the solution when all the solid has dissolved
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Finally, once the solid has completely dissolved, measure the final temperature of the solution to observe the temperature change.
