Edexcel A level Chemistry Topic 11.
Equilibrium 2 Exam 2024 Questions and
Answers 100% Pass
Describe a dynamic equilibrium - Answer>>Dynamic equilibrium
- Rate of forward reaction = rate of reverse reaction
- Concentrations of all reactants and products remain constant.
- The system is closed, and on the large scale (macroscopic)
everything is constant.
What happens if the conditions of an equilibrium reaction change?
- Answer>>- equilibrium will move so that it can be re-
established ( Le Chatliers Principle)
Define Homogenous equilibrium. - Answer>>- all the chemicals
(reactants and products) are in the same phase
Define Heterogenous equilibrium. - Answer>>- different states
of matter are present in the equilibrium.
What is the equilibrium constant Kc? - Answer>>- product of
product concentration to reactant concentration.
Why aren't solids or pure liquids included in the value of Kc in a
heterogenous equilibrium? - Answer>>- because their
concentrations relatively remain the same throughout the reaction
How to calculate units for Kc? - Answer>>- replace the terms in
the Kc expression with their units
- cancel
What is affected by Kc? - Answer>>TEMPERATURE
, What is NOT affected by Kc? - Answer>>- change in pressure
-change in conc of reactants or products
- adding a catalyst.
What two ways can you use to determine the concentration of
reactants or products at equilibrium? - Answer>>1. Titration
2. Colourimeter
How can you use titration to determine the conc of reactants or
products at equilibrium? - Answer>>-
How can you use colourimetry to determine the conc of reactants
or products at equilibrium? - Answer>>- measures the amount
of light absorbed by the mixture
-informs you of how concentrated the mixture is.
- the more light absorbed, the higher the concentration of the
coloured substance.
How to work out equilibrium moles if given initial moles and mole
of one substance at equilibrium? - Answer>>- use
I: initial moles
C:change in moles
E:equilibrium moles
-using the initial and equilibrium moles of the substance given,
work out change in oles
-look at the reaction equation to see stoichiometry of the
reactants/products
-use this to work out the equilibrium moles of the other
substances
(Products always have initial moles of 0)
How to calculate Kc? - Answer>>- calculate/find initial moles of
all the substances
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