kinetics 3.1.5 in papers 2 + 3

Question 1

define the rate of reaction

Answer 1

• change in amount of a reactant or product in a given time period

Question 2

define collision theory.

Answer 2

• a collision between particles needs to have sufficent energy for a reaction to occur

Question 3

define activation energy.

Answer 3

• the minimum energy reacting particles require for successful collision

Question 4

what factors affect the rate of reaction?

Answer 4

• pressure ofmgas
• tempreture
• concentration of a solution
• catalyst

Question 5

what effect does an increase in tempreture have on the intial rate of reaction and final volume?

Answer 5

• initial rate = increase
• final volume = no effect

Question 6

what effect does an increase in concentration have on the intial rate of reaction and final volume?

Answer 6

initial rate = increase
final volume = increases if its the limiting reagent

Question 7

what effect does an increase in surface area have on the intial rate of reaction and final volume?

Answer 7

initial rate = increase
final volume = no effect

Question 8

what effect does an increase in surface area have on the intial rate of reaction and final volume?

Answer 8

initial rate = increase
final volume = no effect

Question 9

what effect does adding a catalyst have on the intial rate of reaction and final volume?

Answer 9

inital rate = increase
final volume = no effect

Question 10

why does a maxwell boltzmann curve go through the origin?

Answer 10

no particles have no energy

Question 11

what does asymptotically mean?

Answer 11

doesnt touch the x-axis, particles have an infinite amount of energy

Question 12

what does the area under the curve mean?

Answer 12

total number of particles

Question 13

what is the maximum energy?

Answer 13

there isnt one

Question 14

whats the most probable energy?

Answer 14

the most common energy under the peak

Question 15

where is the mean energy?

Answer 15

right hand side of the graph/lower part

Question 16

what happens when we increase tempreture on a boltmann curve?

Answer 16

• reaction increases
• particles have more kenetic energy and move faster
• so greater amount of molecules will have energy equal to or greater than activation energy and therefore increase the rates of successful collisions
• graphs peak is lower and shifts to the right

Question 17

what effect does a catalyst have on boltzmann curve?

Answer 17

• increases rate of reaction by providing an alternative route with lower activation energy
• it remains chemically unchanged and is regenerated

Question 18

what effect does pressure have on the boltzmann curve?

Answer 18

• lower pressure = lower peaker peak
• less numbers of particles with energy equal to or more than activation energy