Rates

Question 1

Equation for rate

Answer 1

Change in concentration/ time mol do-3 s-1

Question 2

When is rate fastest

Answer 2

At start

Question 3

Factors affecting rate

Answer 3

Surface area
Concentration
Catalyst
Pressure

Question 4

Why don’t some reactions occur

Answer 4

Activation energy too high

Not right orientation

Question 5

How to monitor rate

Answer 5

Amount of product made of reactant used

Question 6

Apparatus for rate

Answer 6

Gas syringe

Scales

Question 7

Calculating rate from mass loss graph

Answer 7

Tangent at 0 calculate gradient

Question 8

Catalysts

Answer 8

Don’t get used up
May become intermediate
Lowers activation energy

Question 9

Homogeneous catalyst

Answer 9

Same physical state of reactants

Question 10

Heterogeneous catalyst

Answer 10

Different physical state

Question 11

Boltzmann distribution X and Y axis

Answer 11

Y= number of molecules
X= energy

Question 12

Effect of increasing temperature on Boltzmann

Answer 12

Gets wider, more past activation energy

Question 13

Effect of catalyst on Boltzmann distribution

Answer 13

Push Ea back

Question 14

What is le Chatlier principle

Answer 14

Systems re adjust to minimise change

Question 15

What happens to Equilibrium when temp rises in exothermic

Answer 15

Shifts left

Question 16

What happens to equilibrium when temperature rises endothermic

Answer 16

Shifts right

Question 17

What happens to equilibrium when pressure increases

Answer 17

Favours the side with fewer gaseous molecules

Question 18

If products increase relatively what does equilibrium do to change

Answer 18

Shifts left

Question 19

If reactants increase relatively what does equilibrium do

Answer 19

Shift right

Question 20

What is the equation for KC

Answer 20

KC = (products)/(reactants)