14- Finding Actication Energy of Reaction

Question 1

Describe the method to work out the activation energy of a reaction - CP14

Answer 1

Question 2

What measurements do we measure for in the reaction and what do we turn these into to work out activation energy - CP14

Answer 2

Time for reaction = natural log of reciprocal time ( Ln 1/t)

Temp of reaction = reciprocal of temp (1/T) in K(-1)

Question 3

Equations for activation energy core prac - CP14

Answer 3

BrO3(-) + 5Br(-) + 6H(+) = 3Br2 + 3H2O

C6H5OH + 3Br2 = C6H2Br3OH + 3HBr

Question 4

What is happening in the reaction mixture of the activation energy Core prac CP14 - where bromine reacts with Phenol

Answer 4

Bromine produced in Reaction 1 reacts with Phenol in 2nd reaction

When phenol is used up bromine is no longer removed but is still being produced = bromine bleaches the METHYL RED indicator instantly at end of reaction

Question 5

Arrenhious Equation simple form

Answer 5

Lnk = LnA - Ea/RT

Question 6

What can replace rate of reaction/ Lnk in arrenhious equation

Answer 6

1/t

Question 7

What is equal to the gradient in arrenhious equation compared to
Y = mx + c

Answer 7

Gradient = -Ea/R

Question 8

What is LnA in the y = mx + c

Answer 8

C = LnA

Question 9

How to remove a log / LnA to just A

Answer 9

LnA = 30.1

A = e(30.1)

= 1.18 x10(13)

Question 10

What unit is activation energy

Answer 10

Joules per mole

Question 11

What is on the axis in arrenhious plot

Answer 11

Lnk/ 1/t as rate on = Y acix

1/T as temp on = X axis