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The direction of reversible reactions can be changed by changing the conditions. For example: colour change. Interpret the results (blue then red) in terms of the thermal decomposition of the ammonium chloride into ammonia and hydrogen chloride. 5.6.2.2 If a reversible reaction is exothermic in one direction, it is endothermic in the opposite direction. The same amount of energy is transferred in each case. For example: 0.5 Recall definition of: exothermic endothermic. Describe the effects of temperature on the reversible reaction. Investigate the temperature changes for: Video clips: YouTube: 5.6.2.3 When a reversible reaction occurs in apparatus prevents the escape of reactants and products, equilibrium is reached when the forward and reverse reactions occur at exactly the same rate. WS 1.2 0.5 Explain the term equilibrium and given suitable examples of when it can occur. Research examples of equilibrium reactions in industry. Video clip YouTube: