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Questions and Answers
What is the purpose of using a 'coffee cup calorimeter' in a school laboratory?
What is the purpose of using a 'coffee cup calorimeter' in a school laboratory?
- To record the minimum and maximum temperatures of the reaction mixture
- To accurately measure enthalpy changes
- To calculate the heat absorbed by the calorimeter
- To reduce heat loss to the surroundings (correct)
Why is polystyrene preferred for the construction of the calorimeter?
Why is polystyrene preferred for the construction of the calorimeter?
- It reduces heat loss to the surroundings (correct)
- It is a poor heat insulator
- It absorbs a significant amount of heat itself
- It is not suitable for accurate experimental measurements
What can be inferred about the measurement of enthalpy changes using a vacuum flask calorimeter?
What can be inferred about the measurement of enthalpy changes using a vacuum flask calorimeter?
- It is not suitable for school laboratory experiments
- It is less accurate than using a coffee cup calorimeter
- It requires the calculation of heat absorbed by the calorimeter
- It provides more accurate experimental measurements (correct)
What is the advantage of using an expanded polystyrene cup as a calorimeter?
What is the advantage of using an expanded polystyrene cup as a calorimeter?
How are enthalpy changes of a reaction calculated using a 'coffee cup calorimeter'?
How are enthalpy changes of a reaction calculated using a 'coffee cup calorimeter'?
What is the equation for calculating the heat released or absorbed?
What is the equation for calculating the heat released or absorbed?
What does a positive value of q indicate in a chemical reaction?
What does a positive value of q indicate in a chemical reaction?
What type of substances tend to have lower specific heat capacity values?
What type of substances tend to have lower specific heat capacity values?
What does a high specific heat capacity of water indicate?
What does a high specific heat capacity of water indicate?
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?
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?
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