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Experimental Measurement of Enthalpy Changes in Chemistry

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Experimental Measurement of Enthalpy Changes in Chemistry

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Questions and Answers

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?

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?

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?

It reduces heat loss to the surroundings Signup and view all the answers

How are enthalpy changes of a reaction calculated using a 'coffee cup calorimeter'?

By recording the minimum and maximum temperatures of the reaction mixture Signup and view all the answers

What is the equation for calculating the heat released or absorbed?

q = mc∆T Signup and view all the answers

What does a positive value of q indicate in a chemical reaction?

The reaction is endothermic Signup and view all the answers

What type of substances tend to have lower specific heat capacity values?

Metals Signup and view all the answers

What does a high specific heat capacity of water indicate?

Water retains heat for a longer period Signup and view all the answers

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 Signup and view all the answers