1.5 Kinetics

Question 1

What must happen for a reaction to occur?

Answer 1

Particles must collide

Question 2

Define rate of reaction

Answer 2

The change of concentration/amount of a reactant or product per unit time

Question 3

Equation for rate of reaction

Answer 3

(Amount of reactant used/ product made) / Time

Question 4

Collision Theory

Answer 4

1. For a reaction to occur the particles must collide in the right direction
2. They must also have a minimum amount of kinetic energy

Question 5

Define Activation Energy

Answer 5

The minimum amount of energy required for a reaction to occur

Question 6

What does the Maxwell-Boltzmann Distribution show?

Answer 6

The kinetic energy in gas particles

Question 7

True or false. Particles of gas in a sample all have the same amount of kinetic energy

Answer 7

False

Question 8

How do you calculate the total number of particles in the Maxwell-Boltzmann Distribution?

Answer 8

Find the area under the curve

Question 9

What affects rate?

Answer 9

Temperature, Pressure, Concentration, Catalyst

Question 10

How does increasing temperature affect the Maxwell-Boltzmann Distribution?

Answer 10

1. Curve shifts to the RIGHT
2. Peak is LOWER
3. Area under curve is the SAME
4. Area under the curve beyond activation energy INCREASES

Question 11

As temperature is increased, a ______ proportion of the molecules will have energy greater than the __________ ______. Larger ____ under the curve beyond the activation energy.

Answer 11

larger ; activation energy ; area

Question 11

How does decreasing temperature affect Maxwell- Boltzmann Distribution

Answer 11

1. Curve shifts to the LEFT
2. Peak is HIGHER
3. Area under curve is the SAME
4. Area under the curve beyond activation energy DECREASES

Question 12

When we decrease temperature, a _______ proportion of the molecules will have energy greater than the __________ ______. Area under the curve beyond the activation energy is _______.

Answer 12

smaller ; activation energy ; smaller

Question 13

Why do we get a faster rate of reaction when temperature is increased?

Answer 13

Particles move around more at higher temperatures so they collide more often and with more energy

Question 14

Other than temperature, what else affects the rate of a reaction?

Answer 14

Concentration and pressure

Question 15

How does increasing pressure/concentration affect rate of reaction

Answer 15

Particles are closer together and collide more often. There are more frequent collision and a higher chance of a reaction

Question 16

Define Catalyst

Answer 16

A substance that increases the rate of a reaction by providing an alternative pathway that has a lower activation energy.