This reaction is used by a water-treatment company to remove ammonia from waste gas. Fig. 1 shows an energy profile for a reaction in which ammonia is oxidi...

Assessment: Chemistry 9202 | Paper 1 Mock 01 | Written Paper 1 Subject: Chemistry - 9202

Question 1 Report

This reaction is used by a water-treatment company to remove ammonia from waste gas. Fig. 1 shows an energy profile for a reaction in which ammonia is oxidised. The products are lower in energy than the reactants.

(a) Name the type of energy change shown. [1]
(b) Give the name for the energy needed to start this reaction. [1]
(c) Use Fig. 1 to describe the energy changes as the reaction takes place. [3]

reactantsproductsenergypeakreaction progress

Answer Details
  1. The products are lower in energy than the reactants, so this is an exothermic reaction. [1]
  2. The energy needed to start a reaction is the activation energy. [1]
  3. Energy is first taken in to reach the peak, which corresponds to breaking bonds in reactants. When new product bonds form, more energy is released than was taken in. The products therefore finish at lower energy than the reactants. [3]
Read lesson note on Exothermic And Endothermic Reactions (OxfordAQA)
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