Core practical - Energy changes (AQA GCSE Chemistry): 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 occurs when zinc reacts with hydrochloric acid?
What type of reaction occurs when zinc reacts with hydrochloric acid?
Exothermic
Why is a polystyrene cup used in this experiment?
Why is a polystyrene cup used in this experiment?
It's a poor conductor of heat
Why must excess zinc powder be added to the acid?
Why must excess zinc powder be added to the acid?
So all the acid reacts completely
What pattern do the results show about acid concentration and temperature rise?
What pattern do the results show about acid concentration and temperature rise?
More acid = higher temperature rise
Why must the zinc powder be stirred vigorously?
Why must the zinc powder be stirred vigorously?
So it mixes well and reacts completely
Which temperature should be recorded as the result?
Which temperature should be recorded as the result?
Maximum temperature
Why is the total volume kept at 50 cm³ in all experiments?
Why is the total volume kept at 50 cm³ in all experiments?
To make the comparison fair
What essential safety equipment must always be worn?
What essential safety equipment must always be worn?
Eye protection
What volume of dilute hydrochloric acid is measured at the start?
What volume of dilute hydrochloric acid is measured at the start?
50 cm³
What does an exothermic reaction do?
What does an exothermic reaction do?
Releases heat energy
What must be recorded when acid is first added to the cup?
What must be recorded when acid is first added to the cup?
Starting temperature
What is the temperature rise when 50 cm³ of acid is used?
What is the temperature rise when 50 cm³ of acid is used?
25.0°C