Rates Of Reaction Flashcards
Describe a precipitation reaction to measure the rate of reaction
The product is a precipitate that turns the solution cloudy
You must observe a point through the flask and measure the time taken for the solution to turn cloudy.
What are the disadvantages of a precipitation reaction to measure the rate of reaction?
It requires the initial solution to be clear
It is subjective
Describe a change in mass in a balance as a way of measuring rate of reaction
Way of measuring the rate of reaction for a reaction that produces a gas
As the gas is released the mass on the reading of the balance drops and is easily measured
The quicker the balance drops, the faster the rate of reaction
What are the advantages of a change in mass as a measure of rate of reaction?
> it is the most accurate if the three methods as the mass reading on the balance is very accurate
> it produces the most accurate rate of reaction graphs
What does the rate of reaction depend on?
> temperature
> pressure/concentration
> catalyst
> surface area for solids
What are 3 methods for measuring the rate of reaction?
> precipitation
> change in mass
> volume of gas
Describe the volume of gas given off as a way of measuring rate of reaction
A gas syringe is used to measure the volume of gas given off
The more gas given off in a time period, the faster the rate of reaction
What are the advantages and disadvantages of gas given off method?
> gas syringes are accurate to the nearest mm, so produce accurate results that are easy to plot on a graph
> if the reaction is too vigorous it can blow the plunger off the syringe.
What are the disadvantages of a change in mass experiment for the rate of reaction?
> it releases gas straight into the room
> If there is heat involved it is not very accurate as mass can be lost via evaporation
