A2 OCR Salters B Chemistry AI Activity Sheet 3.1 Understanding equilibria

After covering the activity sheet in class, and having to think hard about the answers, I thought the points from it would make good flashcards on the principles of equilibria.

The cards are in 'true or false' format.

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  • Created by: Emily
  • Created on: 09-01-13 16:30
When a reactant is added to a system in equilibrium, the forward reaction will occur to use up all of the added material and so restore the equilibrium.
False - SOME of the added material is used up, NOT all
1 of 8
When a reactant is added to a system in equilibrium, more product is produced but the value of the equilibrium constant, K, remains unaltered.
True - the equilibrium constant K is only affected by temperature changes
2 of 8
A system reaches equilibrium when the concentration of the reactants is equal to the concentration of the products.
False - a system reaches equilibrium when the RATE of the forward reaction is equal to the rate of the backward reaction
3 of 8
A high value of the equilibrium constant, K, means that the forward reaction is very fast.
False - K is a ratio found from the concentration of the reactants and products and gives no indication of the rate of reaction
4 of 8
When the reactants of an equilibrium system are mixed together the rate of the forward reaction increases until equilibrium is established.
False - a reaction is at its fastest at the beginning of it
5 of 8
A catalyst increases the rate of reaction of both the forward and reverse reactions.
True
6 of 8
In an equilibrium system in which the forward reaction is endothermic, the reverse reaction is exothermic.
True
7 of 8
If a system in equilibrium, where the forward reaction is endothermic, is heated, the rate of the forward reaction increases but the rate of the reverse reaction decreases.
True - based on le Chatelier's principle, if the temperature of an equilibrium system increases, the equilibrium will shift to the side where the endothermic reaction is taking place
8 of 8

Other cards in this set

Card 2

Front

When a reactant is added to a system in equilibrium, more product is produced but the value of the equilibrium constant, K, remains unaltered.

Back

True - the equilibrium constant K is only affected by temperature changes

Card 3

Front

A system reaches equilibrium when the concentration of the reactants is equal to the concentration of the products.

Back

Preview of the front of card 3

Card 4

Front

A high value of the equilibrium constant, K, means that the forward reaction is very fast.

Back

Preview of the front of card 4

Card 5

Front

When the reactants of an equilibrium system are mixed together the rate of the forward reaction increases until equilibrium is established.

Back

Preview of the front of card 5
View more cards

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