rate of reaction c9

What is the rate of reaction?

It is how quickly the reactants turn into the products

What is the equation for calculating the mean rate of the reaction

Mean rate = change in quantity of product or reactant/ time taken

What is the unit for rate of reaction in a reaction involving a change in mass?

g/s

What is the unit for rate of reaction in a reaction involving a change in volume?

Cm3/s

How can you measure the rate of a reaction that produces gas?

• Measure change in mass using a balance

• Measure volume of gas produced using a syringe or upside down measuring cylinder

What is a precipitate?

An insoluble solid in a solution

How can you measure the rate of a reaction that produces a precipitate

Measure how long it takes for a cross to disappear

What is the activation energy?

The minimum amount of energy colliding particles need to have before a reaction will take place

What effect does increasing concentration have on the rate of reaction

It increases

Why does increasing pressure have this effect

Less space between particles means more frequent collisions

What effect does increasing surface area have on the rate of reaction

It increases

Why does increasing surface area have this effect

More reactant particles are exposed and able to collide leading to more frequent collisions

What effect does increasing temperature have on the rate of reaction

It increases

Why does temperature have this effect

Particles move faster which equals more collisions - particles have the same activation energy, so more collisions result in a reaction

What is a catalyst

A substance that increases the rate of a reaction but is not used up in the reaction

How do catalysts increase the rate of a reaction

Lower the activation energy of the reaction so more collisions result in a reaction