required practical 3: change in rate reaction due to temperature

Question 1

how is rate measured

Answer 1

1/time

Question 2

how is time measured

Answer 2

time taken for the cross under the reaction mixture to disappear

Question 3

method for this experiment

Answer 3

measure set volumes of HCl and sodium thiosulfate into boiling tubes, using measuring cylinders
use different temperatures, cold water bath/ hot water bath/ room temp
place flask over cross
add sodium thiosulfate then HCl and start the timer
mix reaction mixture
stop the clock when cross disappears

Question 4

arrhenius equation

Answer 4

lnk=lnA – E a/RT

Question 5

how is the graph plotted to find the activation energy

Answer 5

1/T = x axis
ln (1/T) = y axis
work out gradient = Ea/R
work out activation energy = gradient X R