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Heat energy changes in chemical reactions

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Question 18

A student wants to investigate the heat energy released when different metal powders react with excess aqueous copper(II) sulfate solution.

Figure 1 shows the apparatus available in the laboratory. Figure 2 shows a bar chart of the typical results obtained, representing the temperature increase of the solution per mole of metal added for three different metal powders: iron, zinc, and magnesium.

Figure 1: Schematic of the solution calorimetry experimental setup showing a polystyrene cup calorimeter supported in a beaker, containing a solution, with a thermometer inside. Next to it are a weighing boat with powder sample on a digital balance, and a graduated measuring cylinder.

Figure 2: A bar chart illustrating the temperature change per mole of metal added in °C/mol for Iron (Fe), Zinc (Zn), and Magnesium (Mg).

Describe an experimental method, using the apparatus in Figure 1, to obtain results that allow a comparison of the heat energy released per mole by these three different metals.

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Heat energy changes in chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /Heat energy changes in chemical reactions

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