Required practical - Energy changes (AQA GCSE Chemistry Combined Science): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What type of reaction is it when zinc reacts with hydrochloric acid?
What type of reaction is it when zinc reacts with hydrochloric acid?
Exothermic
Why is a polystyrene cup used in this practical?
Why is a polystyrene cup used in this practical?
It is a poor conductor of heat
What happens to temperature rise as acid concentration increases?
What happens to temperature rise as acid concentration increases?
Temperature rise increases
Why is the total volume always kept at ?
Why is the total volume always kept at ?
To make it a fair test
Why must zinc powder be in excess?
Why must zinc powder be in excess?
So all the acid reacts
What happens to temperature in an endothermic reaction?
What happens to temperature in an endothermic reaction?
Temperature decreases
Why must you stir the mixture vigorously?
Why must you stir the mixture vigorously?
To maximize contact between reactants
Which temperature should be recorded as the result?
Which temperature should be recorded as the result?
The maximum temperature reached
Why should zinc powder be added quickly?
Why should zinc powder be added quickly?
So all reactions start simultaneously
Which acid volume gave the highest temperature rise in the example results?
Which acid volume gave the highest temperature rise in the example results?
What type of heat conductor is polystyrene?
What type of heat conductor is polystyrene?
Poor conductor
What happens to temperature in an exothermic reaction?
What happens to temperature in an exothermic reaction?
Temperature increases