Mod 5

Question 1

What are reaction orders

Answer 1

. The order with respect to the reactants tells you how a rate of reaction will be affected if you change the reactants concentration
. Found experimentally

Question 2

What are zero, first, second, and overall order

Answer 2

. 0 - rated unaffected by any changes in concentration
. 1 - rate changes the same as the change in concentration
. 2 - Rate changes by the square of the change in concentration
. Overall - The sum of all the individual orders (1+1+2)

Question 3

What do you concentration time graphs for zero, first, and second order look like

Answer 3

. 0 - \ constant gradient
. 1 - slow curve, constant half life
. 2 - steep curve, half life increases with time and is not constant

Question 4

What do you write concentration graphs for zero, first, and second order look like

Answer 4

. 0 - - horizontal- grad=0
. 1 - /
. 2 - ) Upward sloping curve

Question 5

What is the logarithmic form of the Arrhenius equation

Answer 5

. Lnk = - (Ea/RT) + lnA

Question 6

What is Rate determining step

Answer 6

. The slowest step in the reaction mechanism

Question 7

How do you find the value for partial pressures

Answer 7

. Mole fraction for gas A = number of moles of gas A/total numbers of moles of all gases
. P (A) = X times P
. Sum. Of all mole fraction should be one
. Some of partial pressures equal same as total pressure

Question 8

How do you temperature concentration and pressure affect KC or KP

Answer 8

. Only change with a change in temperature not with a change in either concentration or pressure

Question 9

What happens to KC if the concentration is changed

Answer 9

. If concentration of reactant is increased, bottom term in KC the expression temporarily increases and KC temporarily decreases
. Position of equilibrium shift to the right to minimise change
. Talk to mum increases with shift in case he will now increase until it returns to original value