Exothermic & Endothermic Reactions (AQA GCSE Chemistry Combined Science): Quizzes

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Required Practical: Investigating Temperature Changes
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What volume of hydrochloric acid is used in this experiment?

25 cm³

What temperature should the hydrochloric acid be heated to before adding it to the cup?

25°C

What type of cup is used to minimize heat loss to the surroundings?

Polystyrene cup

What mass of powdered magnesium is added to the hydrochloric acid?

1 g

How often should the temperature be measured and recorded during the experiment?

Every 30 seconds

For how long should the temperature be monitored in total?

5 minutes

Which temperature should be recorded during the reaction?

The highest temperature reached

By how much should the acid concentration increase between each repeat of the experiment?

0.2 g/dm30.2\text{ g/dm}^3

What is the starting concentration of hydrochloric acid in this investigation?

0.2 g/dm30.2\text{ g/dm}^3

What is used to further insulate the polystyrene cup?

Cotton wool in a beaker

If temperature increases during a reaction, what type of reaction is it?

Exothermic, releasing energy

If temperature decreases during a reaction, what type of reaction is it?

Endothermic, absorbing energy

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