Reactions and Reactivity

Question 1

What is a reaction?

Answer 1

The transformation of one set of chemicals into another

Question 2

What is the collision theory?

Answer 2

Reactant molecules must collide with sufficient energy for a reaction to occur

Question 3

What is activation energy?

Answer 3

The energy required for a collision between reactant molecules

Question 4

What is an exothermic reaction?

Answer 4

Releases energy to the surroundings

Gives out heat

Question 5

What is an endothermic reaction?

Answer 5

Removes energy from the surroundings

Requires heat

Question 6

Under what circumstances will no reaction occur?

Answer 6

If molecules collide with too little or too much energy

Question 7

Name four ways in which the rate of reaction can be increased?

Answer 7

Increase temperature
Increase concentration
Increase surface area
Introduce a catalyst

Question 8

What is a catalyst and how do they work?

Answer 8

Increase the rate of reaction by lowering the activation energy without being consumed

Question 9

What is gibbs free energy?

Answer 9

Energy available in a substance to do work

Question 10

What is an exergonic reaction?

Answer 10

A reaction in which the change of free energy is negative
There is a net release of free energy
Indicates a spontaneous reaction

Question 11

What is an endergonic reaction?

Answer 11

A reaction in which the change in free energy is positive
There is a net intake of free energy
Indicates a non spontaneous reaction