1.5 Kinetics

Question 1

What does a reaction need to occur

Answer 1

Energy greater than or equal to the activation energy, and correct particle orientation

Question 2

What must remian constant, in the Maxwell-Boltzmann distribution

Answer 2

The area under the graph (molecules in the sample)

Question 3

What are 5 ways to increase rate of rection

Answer 3

1. Increase Pressure (gas only)
2. Increase temperature
3. Increase concentration
4. Add a catalyst
5. Increase surface area

Question 4

Explain how increasing surface area has an effect on rate of reaction

Answer 4

Increase SA
More chance of collisions
More frequent collisions lead to increase rate of reaction

Question 5

Explain how increasing temperature has an effect on rate of reaction

Answer 5

Increase temperature
Particles have more thermal / kinetic energy
So they move faster
Increasing chance of collisions
and also the force of collisions

Question 6

How does increasing the temp affect the Maxwell-Boltzmann curve

Answer 6

Shifts it to the right
Broader and flatter
Constant area under graph

Question 7

How do catalyst work

Answer 7

Lower the activation energy by finding an alternative reaction pathway

Question 8

Name and explain the two types of catalysts

Answer 8

• Heterogenous Catalysts - same phase as reactants
• Homogenous catalysts - diff phase to reactants

Question 9

Explain how increasing concentration has an effect on rate of reaction

Answer 9

Increasing conc.
More molecules in a given volume
Collisions more likely

(same for pressure tbh)

Question 10

How does increasing the pressure/conc. affect the Maxwell-Boltzmann curve

Answer 10

Peaks higher
But the shape is the same
Constant area under the graph

Question 11

How does a catalyst affect the Maxwell-Boltzmann distribution

Answer 11

Shape is unchanged
The activation energy (Ea) is shifted to the left