Edexcel IGCSE Chemistry - Physical Chemistry: Rates of Reaction

These flashcards cover the key concepts of rates of reaction in Edexcel IGCSE Chemistry.

Increasing the temperature increases the

rate of reaction. As increasing temperature

increases the speed of the moving particles, so

they collide more frequently and energetically

How does tempurature affect the rate of reaction?

Increasing pressure in reacting gases increases the rate of reaction, as it increases the frequency of collisions.

How does pressure of reactant gas affect rate of reaction?

product; reactant

The rate of reaction can be measured using the amount of used or amount of formed over time.

A Catalyst is a substance that increases the rate of a reaction but is chemically unchanged at the end of the reaction

Define a ‘Catalyst’.

Catalysts work by providing an alternative pathway with lower activation energy.

What do catalysts do?

Increasing the concentration of reacting solutions increases the rate of reaction.

How does concentration affect the rate of reaction?

Increasing the surface area of solid reactants increases the rate of reaction.

How does ‘Surface Area’ affect the rate of reaction?

Using smaller marble chips increases the surface area, which causes an increase in the reaction rate when reacted with hydrochloric acid.

How does using smaller marble chips affect the rate of reaction?

In particle collision theory, increased temperature results in more frequent and energetic collisions.

g/s or cm3/s

Units for rate of reaction can be given as or .

Rate of reaction = amount of reactant used/time

What is the equation for rate of reaction? (option1)

Rate of reaction = amount of product formed/time

What is the equation for rate of reaction euqation (option 2)