Topic 2.1 rate of reactions

What are the two rate of reaction formulas?

Rate = change in the amount of substance / time taken

Rate = change in concentration / time taken

What are the two ways that rate of reaction can be described?

Average rate of reaction & instantaneous rate of reaction

What is the average rate of reaction

The rate over a period of time

What is the instantaneous rate of reaction?

Rate over a particular instant of time = gradient of quantity of reactant or product vs. Time graph

What an the two important theories in the collision theory

1. The reactant particles must collide with a certain minimum amount of every, called the activation energy

2. Particles must collide with proper geometry a incantation for atoms to come in direct contact and form chemical bonds of the products

What are the five factors affecting the rate of reactions?

Concentration of reactants, pressure, temperature, surface area and catalyst

How are catalyst defined

An alternative pathway that has lower activation energy

What does the exothermic reaction graph look like?

What is the change in enthalpy in exothermic reactions?

Negative

What does the endothermic reaction graph look like?

What is the change in enthalpy in endothermic reactions?

Positive