Chemical Equilibrium

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  • Created by: J.E.C.
  • Created on: 28-04-14 16:29
In any gas, the molecules are constantly __ rapidly and in __ directions?
Moving, random
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When the system is at equilibrium the molecules enter...?
And leave at the same rate
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It is therefore known as dynamic equilibrium because..?
It is a reversible change
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The rates of the forward and reverse reactions are the same when equilibrium is reached, but this does not mean the ___ of the reactants and products are the same?
Concentrations
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The position of equilibrium lies to the right (products) if...?
The forward reaction is nearly complete before the rate of the reverse reaction has increased sufficiently to establish equilibrium.
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We reach the same equilibrium position regardless of whether...?
We start with the reactants or products.
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State Le Chatelier's principle?
If a system is at equilibrium and a change is made in any of the conditions, then the system responds to counteract the change as much as possible.
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What effect does a catalyst having on equilibrium position?
Speeds up the rate at which the equilibrium position is reached
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Increasing the concentration of the reactants, causes the equilibrium to shift to move to the ___ side?
Product
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Increasing the concentraion of the products causes the equilibrium to move to the ___ side?
Reactant
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Decreasing the concentration of reactants causes the equilibrium to move to the __ side?
Reactant
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Decreasng the concentration of the products, causes the equilibrium to move to the ___ side?
Product
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Increasing the pressure, moves the equilibrium to the side of the equation with __ gas molecules as this tends to reduce the pressure?
Fewer
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Decreasing the pressure moves the equilibrium to the side of the equation with ___ molecules as this tends to increase the pressure?
More
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Heating a reversible reaction at equilibrium shifts the reaction in the direction of the __ reaction?
Endothermic
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Cooling a reversible reaction at equilibrium shifts the reaction in the direction of the ___ reaction?
Exothermic
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The enthapy change value given, always represents the __ reaction?
Forward
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Where CO2 produced in one reversible reaction and is the reactant of the reaction involving CO2 + H2O gives HCO3 and H+ in a reversible reaction, give the effect of adding more gaseous Carbon Dioxide?
Position of the first equilibrium moves to the right because more CO2 is formed. Position of second equilibrium shifts to the righ to produce more HCO3 and H+.
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A chemical equilibrium can only be established in a __ system but in an open tube, a series of reactions can reach a __ __, where the concentrations of reactants and products...?
Closed, steady state, remain constant
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Other cards in this set

Card 2

Front

When the system is at equilibrium the molecules enter...?

Back

And leave at the same rate

Card 3

Front

It is therefore known as dynamic equilibrium because..?

Back

Preview of the front of card 3

Card 4

Front

The rates of the forward and reverse reactions are the same when equilibrium is reached, but this does not mean the ___ of the reactants and products are the same?

Back

Preview of the front of card 4

Card 5

Front

The position of equilibrium lies to the right (products) if...?

Back

Preview of the front of card 5
View more cards

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