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Cambridge Secondary (7-9). Stage 8. MCE Science. Student Book - Unit 7: Exothermic and Endothermic Changes - Question 83

Cambridge Secondary (7-9) · Unit 7: Exothermic and Endothermic Changes

Question 83

Figure 7.31 shows the apparatus used for the thermal decomposition of calcium nitrate to form calcium oxide, nitrogen dioxide and oxygen.

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An energy level diagram is used to show the changing energy levels during a chemical reaction. It can show whether a reaction is exothermic or endothermic.

Figure 7.32 shows the energy level diagram for the thermal decomposition of calcium nitrate. Complete the diagram by choosing the correct words to label A and B in the diagram.

Words: reactant; products.

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