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Topic 7 Equilibrium
7.1 Dynamic equilibrium
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Understandings:
A state of equilibrium is reached in a closed system when the rates of the forward and reverse reactions are equal. Applications and skills: The characteristics of chemical and physical systems in a state of equilibrium. |
7.1 Physical equilibrium
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Understandings:
A state of equilibrium is reached in a closed system when the rates of the forward and reverse reactions are equal. Applications and skills: The characteristics of chemical and physical systems in a state of equilibrium. |
7.1 Equilibrium constant Kc.
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Understandings:
The equilibrium law describes how the equilibrium constant (Kc) can be determined for a particular chemical reaction. The magnitude of the equilibrium constant indicates the extent of a reaction at equilibrium and is temperature dependent. Applications and skills: Deduction of the equilibrium constant expression (Kc) from an equation for a homogeneous reaction. |
7.1 Reaction quotient Q
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The reaction quotient (Q) measures the relative amount of products and reactants present during a reaction at a particular point in time. Q is the equilibrium expression with non-equilibrium concentrations.
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7.1 Manipulating Kc
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Guidance:
Relationship between Kc values for reactions that are multiples or inverses of one another should be covered. |
7.1 Le Chatelier's principle (changes in concentration)
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Applications and skills:
Application of Le Châtelier’s principle to predict the qualitative effects of changes of temperature, pressure and concentration on the position of equilibrium and on the value of the equilibrium constant. This video covers changes in concentration. The next video covers changes in pressure. |
7.1 Le Chatelier's principle (changes in pressure)
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Applications and skills:
Application of Le Châtelier’s principle to predict the qualitative effects of changes of temperature, pressure and concentration on the position of equilibrium and on the value of the equilibrium constant. This video covers changes in pressure. The next video covers changes in temperature. |
7.1 Le Chatelier's principle (changes in temperature)
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Applications and skills:
Application of Le Châtelier’s principle to predict the qualitative effects of changes of temperature, pressure and concentration on the position of equilibrium and on the value of the equilibrium constant. This video covers temperature. |
7.1 The effect of a catalyst on an equilibrium reaction.
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Understandings:
A catalyst has no effect on the position of equilibrium or the equilibrium constant. |