Required practical - Energy changes (AQA GCSE Chemistry Combined Science): Flashcards
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Practise the cards
13 cards from this deck
Type of reaction when acid reacts with zinc
Type of reaction when acid reacts with zinc
Exothermic
Temperature change in exothermic reactions
Temperature change in exothermic reactions
Increases
Temperature change in endothermic reactions
Temperature change in endothermic reactions
Decreases
Why polystyrene cup is used
Why polystyrene cup is used
Poor conductor of heat, keeps heat in for accurate measurements
Effect of higher acid concentration on temperature rise
Effect of higher acid concentration on temperature rise
Higher temperature rise
Why zinc must be in excess
Why zinc must be in excess
So all the acid reacts
Why zinc powder must be stirred well
Why zinc powder must be stirred well
To ensure complete reaction with acid
Why total volume is kept at 50 cm³
Why total volume is kept at 50 cm³
To control variables and make it a fair test
Aim of the practical
Aim of the practical
Investigate temperature change when different acid concentrations react with zinc
Thermal conductivity property of polystyrene
Thermal conductivity property of polystyrene
Poor conductor of heat
What exothermic reactions release
What exothermic reactions release
Heat energy
Volume of acid + water mixture used
Volume of acid + water mixture used
50 cm³
Why add zinc powder quickly
Why add zinc powder quickly
So all reactions start simultaneously