P2 - 6.4 Reversible Reactions & Dynamic Equilibrium

Question 1

What do we call a reaction if the arrow faces both ways

Answer 1

Reversible reaction

Question 2

Is this a forward or backward reaction

Reactants -> products

Answer 2

Forward reaction

Question 3

Is this a forward or backward reaction

Reactants <- products

Answer 3

Backwards

Question 4

What do we call a reaction if it only has one arrow

Answer 4

One way reaction

Question 5

True or False:
Forward and backward reactions can happen at different rate

Answer 5

True

Question 6

True or False:
Forward and backward reactions can happen at the same rate

Answer 6

False to begin with - they happen at different rates
True once they even out

Question 7

Describe the quantity of reactants and products at the beginning of a reaction

Answer 7

There is loads of reactants and no products

Question 8

At the beginning of a reversible reaction which direction is faster, forward or backward

Answer 8

Forward

Question 9

Describe the quantity of reactants and products at the end of a reaction

Answer 9

Less reactants and lots of product

Question 10

At the end of a reversible reaction which direction is faster, forward or backward

Answer 10

Backward

Question 11

Eventually what will happen in a reversible reaction

Answer 11

The forward and backward reaction will be going at the same speed and even out, they have reached equilibrium

Question 12

At equilibrium describe the rate of reaction in a reversible reaction

Answer 12

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

Question 13

True or False: in a reversible reaction is moving at equilibrium the concentration of reactants and products equal

Answer 13

False they dont have to be equal amounts

Question 14

In a reversible reaction, if the reactants are of a high quantity to the products at what position will equilibrium be

Answer 14

Equilibrium will lie to the right

Question 15

In a reversible reaction, if the products are of a high quantity to the reactants at what position will equilibrium be

Answer 15

Equilibrium will lie to the left

Question 16

What factor could change what position equilibrium is in in a reversible reaction

Answer 16

Heat (push right)
Cool (push left)

Question 17

If we add heat to a reversible reaction what position will equilibrium be in

Answer 17

Lie to the right

Question 18

If we cool a reversible reaction what position will equilibrium be in

Answer 18

Lie to the left

Question 19

True or False: equilibrium can only be achieved in a reversible reaction if it is in a closed system

Answer 19

True

Question 20

True or False: equilibrium can only be achieved in a reversible reaction if it is in an open system

Answer 20

False it has to be in a closed system

Question 21

Why can equilibrium in a reversible reaction only be achieved in a closed system

Answer 21

Products or reactants cant escape in a closed system

Question 22

In which direction is a reversible reaction exothermic

Answer 22

Forward

Question 23

In which direction is a reversible reaction endothermic

Answer 23

Backwards

Question 24

Is a forwards reaction in a reversible reaction endo or exo

Answer 24

Exothermic

Question 25

Is a backwards reaction in a reversible reaction endo or exo

Answer 25

Endothermic

Question 26

What do the terms hydrated and anhydrous mean in this reaction: Hydrated copper sulfate <-> anhydrous copper sulfate + water

Answer 26

Hydrated - water is present Anhydrous - water not present

Question 27

What type of energy does an endothermic reaction require to work

Answer 27

Heat energy

Question 28

What colour is hydrated copper sulfate

Answer 28

They are blue crystals

Question 29

What colour is anhydrous copper sulfate

Answer 29

White powder

Question 30

What is happening in this endothermic reaction: Hydrated copper sulfate <-> anhydrous copper sulfate + water + heat source

Answer 30

The blue crystals (hydrated copper sulfate) is having its water evaporated in order to become a white powder (anhydrous copper sulfate ) + water

Question 31

What is happening in this exothermic reaction: Hydrated copper sulfate <-> anhydrous copper sulfate + water + water source

Answer 31

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

Question 32

What is another way of saying equilibrium

Answer 32

Dynamic equilibrium

Question 33

At equilibrium, if the concentration of reactants is higher than the concentration of products, we say that the position of equilibrium lies to the:

Answer 33

Left

Question 34

In a reversible reaction, if the forward reaction is exothermic, what would be the effect of decreasing the temperature?

Answer 34

Yield of products increases