The greater the frequency of successful collisions between reactant particles, the greater the reaction rate. Temperature, concentration, pressure and the use of catalysts affect reaction rate.
How can the volume of a gas given off be measured during a reaction?
Using a balloon
Using a gas syringe
Using a beaker
How could an average rate of reaction be calculated?
By multiplying the time taken for the reaction to finish by the total volume of gas produced
By dividing the time taken for the reaction to finish by the total volume of gas produced
By dividing the total volume of gas produced by the time taken for the reaction to finish
During a typical chemical reaction, what happens to the rate of reaction over time?
It stays the same
On a graph showing mass of reactant used against time, what does the gradient of the line show?
The mean rate of reaction from start to finish
The rate of reaction at the time where the gradient is calculated
The total mass of reactant used up
What must happen for two particles to react with each other?
They must collide
They must have opposite charges
They must be very small particles
What can you deduce when the line on a reaction graph has become horizontal?
The reaction is at its fastest
The reaction has stopped
The reaction has reversed
In collision theory, what determines the rate of a reaction?
The rate of collisions between particles
The frequency of successful collisions
How many collisions there are
What happens to the mass of a catalyst between the start and end of a reaction?
What is an enzyme?
A biological catalyst
A living organism, such as yeast
A type of industrial process
What happens to the activation energy for a reaction in the presence of a catalyst?