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When the colourless gas, N₂O₄, is left in a closed system it reaches an equilibrium with the brown gas, NO₂.

N ₂ O ₄ (g)                   2NO ₂(g)

(colourless)                            (brown)

When the temperature is increased the equilibrium moves to the right. At low temperatures the equilibrium position lies to the left.

1.       State what is meant by the term closed system.

2.       Give the definition of the term equilibrium.

3.       At room temperature the equilibrium mixture is a constant pale brown colour. Explain why the colour is constant.

4.       The equilibrium mixture is darker at high temperatures. Suggest what happens to the relative quantities of the reactants and products as the temperature is increased.

5.       Suggest what happens to the relative quantities of the reactants and products as the temperature is decreased. Describe what you would therefore expect to happen to the colour of the equilibrium mixture at low temperatures.

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The temperature is increased as the effect of the temperature increases

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2

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the forward & reverse reactions take place at the same rate, they are said to be equilibrium
Endothermic reaction takes in heat. Increasing temperature provides heat to the reaction. endothermic favours high temperature
Endothermic Example 1: Photosynthesis. Endothermic reactions are fairly common. One of the most common examples of an endothermic reaction can be found in your garden. Photosynthesis, the reaction which allows plants to use sunlight to produce food and energy.

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In equilibrium in exothermic reaction heat is the product of the reaction. E.g. neutralisation chemical reactions
-PiPi

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When the forward and reverse reaction take place at the same place at the same rate they are said to be in equilibrium.
Effect on temperature on Endothermic chemical

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When the forward and reverse reaction take place at the same place at the same rate they are said to be in equilibrium

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Equilibrium
Anirudh: effect of increasing concentration of reactants

Kunjala and Vishwa:  Equilibrium and effect of temperature on Endothermic chemical reactions. Give examples of Endothermic chemical reactions.

Pipi and Kashish:

Equilibrium and effect of temperature on Exothermic chemical reactions. Give examples of Exothermic chemical reactions.

Keerthani and sasha:
Dynamic equilibrium and explain it with the help of an example.

Shubh and Kabir:
effect of temperature and pressure on 2SO2 + O2 -> 2SO3

siddhant and Chain:
effect of temperature and pressure on N2 + 3H2 -> 2NH3