Kinetics

Question 1

Definition of Collision Theory

Answer 1

A reaction won’t take place between 2 particles unless they collide in the right direction and they collide with minimum amount of activation energy

Question 2

Definition of Activation Energy

Answer 2

The minimum amount of Kinetic Energy needed to react

Question 3

The change in energy from reactants to products in an Exothermic reaction

Answer 3

Reactants have more energy than products

Question 4

The change in energy from reactants to products in an Endothermic reaction

Answer 4

Reactants have less energy than products

Question 5

What is a Maxwell-Boltzmann Distribution?

Answer 5

A theoretical model that shows the energy of each molecule of a substance has

Question 6

What happens to a Maxwell-Boltzmann Curve if the temperature increases?

Answer 6

More particles have the activation energy so the area of the right increases but the area of the left decreases so that the same number of particles are being represented

Question 7

What happens to a Maxwell-Boltzmann Curve if the concentration/pressure increases?

Answer 7

The whole curve increase upwards and has the same peak as there are more particles in a given area

Question 8

What happens to a Maxwell-Boltzmann Curve if a catalyst is added?

Answer 8

The activation energy moves left

Question 9

Definition of a Catalyst

Answer 9

Increases the rate of a reaction by providing an alternative reaction pathway with a lower activation energy

Question 10

The equation to calculate Rate of Reaction

Answer 10

rate of reaction = amount of reactant used or product formed/time

Question 11

How to measure the rate of reaction (time taken for precipitate to form)

Answer 11

1. place a conical flask on a black X
2. add sodium thiosulfate and hydrochloric acid
3. start a stopwatch and stop when you can no longer see the X

Question 12

How to measure the rate of reaction (change in mass)

Answer 12

1. place a conical flask on a digital mass balance and zero it
2. add calcium carbonate and hydrochloric acid
3. start stop clock and stop when it is at constant mass

Question 13

How to measure the rate of reaction (gas volume)

Answer 13

1. add an acid into a conical flask
2. have a gas syringe attached to a bung on hand and add it immediately when magnesium has been added
3. start a stop clock and stop it when as constant volume of gas produced