Required Practical: Investigating Temperature Changes (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards

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Required Practical: Investigating Temperature Changes
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Volume of HCl used in the experiment

25 cm325 \text{ cm}^3

Initial temperature of the acid

25°C25°C

Container used for the reaction

Polystyrene cup

Mass of powdered magnesium used

1 g1 \text{ g}

Purpose of polystyrene cup

Minimise heat loss to surroundings

Frequency of temperature measurements

Every 3030 seconds

Duration of temperature monitoring

55 minutes

Concentration increment for each repeat

0.2 g/dm30.2 \text{ g/dm}^3

Starting concentration of HCl

0.2 g/dm30.2 \text{ g/dm}^3

Final concentration of HCl

1.0 g/dm31.0 \text{ g/dm}^3

Sign of an exothermic reaction

Temperature increases (releases energy)

Sign of an endothermic reaction

Temperature decreases (absorbs energy)

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