1.5.3 Measuring Reaction Rates

Question 1

Rate of reaction

equation

Answer 1

amount of reactant used or products formed/time

Question 2

Rate of reaction

Answer 2

the change in the amount of reactant or products over time

Question 3

Rate of reaction

units

Answer 3

either

gs-1 or cm3s-1

Question 4

Methods to measure ROR

3

Answer 4

1 time taken for a precipitate to form
2 gas volume
3 change in mass

Question 5

Time taken for a precipitate to form

overview

Answer 5

(disappearing cross experiment)
sodium thiosulphate and HCl = yellow sulphur precipitate
stopwatch and white tile with black cross
repeat with different temps.
use waterbaths

Question 6

Change in mass

overview

Answer 6

using a mass balance
HCl and calcium carbonate = CO2 gas given off
stopwatch
repeat with different temps.
carry out experiment in a fume cupboard
record mass at start and end
reaction finished when mass stops increasing

Question 7

Gas volume

overview

Answer 7

gas syringe
record amount at regular time intervals
magnesium and an acid
stop watch
bung
repeat reaction with acid at different temps
end of reaction = no more gas produced