10 Questions
What is the purpose of using a 'coffee cup calorimeter' in a school laboratory?
To reduce heat loss to the surroundings
Why is polystyrene preferred for the construction of the calorimeter?
It reduces heat loss to the surroundings
What can be inferred about the measurement of enthalpy changes using a vacuum flask calorimeter?
It provides more accurate experimental measurements
What is the advantage of using an expanded polystyrene cup as a calorimeter?
It reduces heat loss to the surroundings
How are enthalpy changes of a reaction calculated using a 'coffee cup calorimeter'?
By recording the minimum and maximum temperatures of the reaction mixture
What is the equation for calculating the heat released or absorbed?
q = mc∆T
What does a positive value of q indicate in a chemical reaction?
The reaction is endothermic
What type of substances tend to have lower specific heat capacity values?
Metals
What does a high specific heat capacity of water indicate?
Water retains heat for a longer period
In the reaction Zn (s) + CuSO4 (aq) → ZnSO4 (aq) + Cu (s), what is the enthalpy change (ΔH) if 50.0 cm3 of a 0.500 mol dm−3 solution of aqueous copper(II) sulfate was reacted with 3.00 g of zinc powder?
+44 kJ
Test your knowledge on experimental measurement of heat changes and enthalpy changes in chemistry. Learn about using a 'coffee cup calorimeter' to determine enthalpy changes and recording the temperature change of reaction mixtures.
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