Kinetics

Question 1

what is collision theory?

Answer 1

a reaction will occur when collisions between particles have sufficient energy

Question 2

what is another term for sufficient energy?

Answer 2

activation energy - minimum amount of energy required for a reaction to take place

Question 3

what is collision energy?

Answer 3

the energy of a particle when it collides

Question 4

what is collision frequency?

Answer 4

number of collisions per unit time

Question 5

what is rate of reaction?

Answer 5

               time

Question 6

what is the maxwell-boltzmann distribution?

Answer 6

theoretical model which plots number of molecules against kinetic energy

Question 7

what is the effect of temperature on rate of reaction -

Answer 7

• increased kinetic energy
• more collisions
• more successful collisions
• higher rate of reaction

Question 8

how would effect of temperature on rate of reaction be represented on maxwell-distribution graph?
why does small increase in temperature lead to large increase in rate?

Answer 8

• peak of curve lower and moves to right
• numberparticles have higher energy increases
• many more particles have energy higher than activation energy
• more kinetic energy
• more likely chance of successful collisions
• higher rate

Question 9

what is the effect of concentration on rate of reaction?

Answer 9

• more particles in given volume
• more frequent collisions
• more successful collisions
• higher rate of reaction

Question 10

what is a catalyst?

Answer 10

a substance that increases rate of reaction without being chemically unchanged

Question 11

how does a catalyst work?

Answer 11

provides an alternative pathway of lowering activation energy