P2 - 6.4 Reversible Reactions & Dynamic Equilibrium Flashcards
The Rate of Extent of Chemical Change
What do we call a reaction if the arrow faces both ways
Reversible reaction
Is this a forward or backward reaction
Reactants -> products
Forward reaction
Is this a forward or backward reaction
Reactants <- products
Backwards
What do we call a reaction if it only has one arrow
One way reaction
True or False:
Forward and backward reactions can happen at different rate
True
True or False:
Forward and backward reactions can happen at the same rate
False to begin with - they happen at different rates
True once they even out
Describe the quantity of reactants and products at the beginning of a reaction
There is loads of reactants and no products
At the beginning of a reversible reaction which direction is faster, forward or backward
Forward
Describe the quantity of reactants and products at the end of a reaction
Less reactants and lots of product
At the end of a reversible reaction which direction is faster, forward or backward
Backward
Eventually what will happen in a reversible reaction
The forward and backward reaction will be going at the same speed and even out, they have reached equilibrium
At equilibrium describe the rate of reaction in a reversible reaction
The concentrations of reactants and products wont change any more - they are moving at constant rate
The reaction is moving backwards and forwards at the same speed
True or False: in a reversible reaction is moving at equilibrium the concentration of reactants and products equal
False they dont have to be equal amounts
In a reversible reaction, if the reactants are of a high quantity to the products at what position will equilibrium be
Equilibrium will lie to the right
In a reversible reaction, if the products are of a high quantity to the reactants at what position will equilibrium be
Equilibrium will lie to the left
What factor could change what position equilibrium is in in a reversible reaction
Heat (push right)
Cool (push left)
If we add heat to a reversible reaction what position will equilibrium be in
Lie to the right
If we cool a reversible reaction what position will equilibrium be in
Lie to the left
True or False: equilibrium can only be achieved in a reversible reaction if it is in a closed system
True
True or False: equilibrium can only be achieved in a reversible reaction if it is in an open system
False it has to be in a closed system
Why can equilibrium in a reversible reaction only be achieved in a closed system
Products or reactants cant escape in a closed system
In which direction is a reversible reaction exothermic
Forward
In which direction is a reversible reaction endothermic
Backwards
Is a forwards reaction in a reversible reaction endo or exo
Exothermic
Is a backwards reaction in a reversible reaction endo or exo
Endothermic
What do the terms hydrated and anhydrous mean in this reaction:
Hydrated copper sulfate <-> anhydrous copper sulfate + water
Hydrated - water is present
Anhydrous - water not present
What type of energy does an endothermic reaction require to work
Heat energy
What colour is hydrated copper sulfate
They are blue crystals
What colour is anhydrous copper sulfate
White powder
What is happening in this endothermic reaction:
Hydrated copper sulfate <-> anhydrous copper sulfate + water
+ heat source
The blue crystals (hydrated copper sulfate) is having its water evaporated in order to become a white powder (anhydrous copper sulfate ) + water
What is happening in this exothermic reaction:
Hydrated copper sulfate <-> anhydrous copper sulfate + water
+ water source
The white powder (anhydrous copper sulfate + water) is adding water to create blue crystals (hydrated copper sulfate) and release any energy stored from the forward reaction
What is another way of saying equilibrium
Dynamic equilibrium
At equilibrium, if the concentration of reactants is higher than the concentration of products, we say that the position of equilibrium lies to the:
Left
In a reversible reaction, if the forward reaction is exothermic, what would be the effect of decreasing the temperature?
Yield of products increases
