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Chemistry

PRACTICAL: Measuring Enthalpy Changes

QuestionAnswer
(Dissolving/Neutralisation/Displacement) What 5 pieces of apparatus are needed for this experiment? - Reactants - Styrofoam (polystyrene) calorimeter & lid - 25 cm3 measuring cylinder - Thermometer & stirrer - Cotton wool
(Dissolving/Neutralisation/Displacement) Why is the mixture placed in a polystyrene cup and cotton? To prevent heat loss to surroundings
(Dissolving/Neutralisation/Displacement) What purpose does the lid serve? To reduce energy lost through evaporation
(Dissolving/Neutralisation/Displacement) What must you ensure is the same about your reactants? Same temperature
(Dissolving/Neutralisation/Displacement) How often should you take the temperature of the mixture? Every 30 seconds
(Combustion) Name a suitable metal container for this experiment and why Copper as it conducts heat well
(Combustion) What do we do to the water before heating it? Measure its temperature
(Combustion) What is one way we could reduce heat lost in this experiment? Using a screen to exclude draughts
(Combustion) What do we weigh before the experiment? Spirit burner and lid
(Combustion) What do we do after the water has reached the set temperature? Weigh the spirit burner and lid again
Created by: JoeMather
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