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?

    <p>It reduces heat loss to the surroundings</p> Signup and view all the answers

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

    <p>By recording the minimum and maximum temperatures of the reaction mixture</p> Signup and view all the answers

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

    <p>q = mc∆T</p> Signup and view all the answers

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

    <p>The reaction is endothermic</p> Signup and view all the answers

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

    <p>Metals</p> Signup and view all the answers

    What does a high specific heat capacity of water indicate?

    <p>Water retains heat for a longer period</p> 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?

    <p>+44 kJ</p> Signup and view all the answers

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