Equilibrium Extra Notes

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How does decomposition of calcium carbonate occur?
Heat it strongly
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At what point do we know equilibrium has been reached?
Concentrations of reactants and products remain constant
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Why is heat drawn in in the evaporation equilibrium?
To allow more molecules to evaporate
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How do molecules enter the liquid phase from the vapour phase?
Strike the liquid and re-enter it
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What sort of equilibrium is it when the rate of condensation equals the rate of evaporation?
Dynamic equilibrium
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If the position of equilibrium shifts to the products, does that mean more reactants or products are produced?
Products - whichever way it shifts, that is what more is currently being produced
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What is the equation for sulfur trioxide decomposing?
2SO3 --> (reversible) 2SO2 + O2
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If the concentration of one substance increases, what happens to equilibrium?
Shifts to the opposite side to balance out
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If the concentration of one substance decreases, what happens to the position of equilibrium?
Shifts to that side to try and increase it
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Give the chemical equation for the chromate ion having H+ added to it and the colours
2(CrO4)2- + 2H+ --> (reversible) (Cr2O7)2- + H2O
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What is the equilibrium law?
Kc is constant only at a particular temperature
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Which reaction will have a higher Kc value. Hydrogen with fluorine, hydrogen with chlorine or hydrogen with bromine?
Hydrogen with fluorine because high electronegativity so more likely to react and equilibrium closer to products
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When hydrogen reacts with halogens, what sign will the Kc value have?
Very positive because high electronegativies so products will be formed
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What sort of value for Kc is present in the reaction N2 + O2 --> (reversible) 2NO?
Very negative and less than 1 (lies more towards reactants)
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What is the difference between the expression for Q and the expression for Kc?
The expressions are identical apart from that the Q concentrations are not equilibrium concentrations. Simply the concentrations present in the reaction mixture
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If equilibrium shifts to products, what reacts more?
The reactants
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What is hydrogen iodide used for?
Production of crystal meth, to make iodides from hydriodic acid and act as a reducing agent
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Do equilibrium constants have units? Why?/Why not?
No because they are measured to a standard concentration of 1moldm-3
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An ICE diagram can use what?
Moles instead of concentration
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In an expression involving partial pressures, instead of square brackets for the concentration, what is used?
Curved brackets and a capital P in front of each compound in the expression
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How do you reverse lnK to get K?
e to the power of lnK
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Other cards in this set

Card 2

Front

At what point do we know equilibrium has been reached?

Back

Concentrations of reactants and products remain constant

Card 3

Front

Why is heat drawn in in the evaporation equilibrium?

Back

Preview of the front of card 3

Card 4

Front

How do molecules enter the liquid phase from the vapour phase?

Back

Preview of the front of card 4

Card 5

Front

What sort of equilibrium is it when the rate of condensation equals the rate of evaporation?

Back

Preview of the front of card 5
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