3- effect of temperature on rate of reaction

Question 1

method- 6 steps

Answer 1

1. use a measuring cylinder to measure 10cm^3 of 0.05moldm^-3 sodium thiosulfate solution into a conical flask. Place this on a white tile with a black cross
2. record initial temp
3. add 1cm^3 of 1moldm^-3 HCl to sodium thiosulfate and start timing
4. record time for cross to disappear
5. record final temp of reaction mixture
6. repeat (using water baths/ice) to get results for at least 5 different temps

Question 2

how to calculate rate of reaction

Answer 2

1/t x 1000

Question 3

why are small amounts of reactants used in this reaction

Answer 3

so less sulfur dioxide is produced as it is toxic

Question 4

why wouldnt you carry out the experiment at temperatures under 10 degrees

Answer 4

the reaction would be too slow/take too long

Question 5

why should you record the stopwatch time to the nearest second and not the nearest 0.01 second

Answer 5

its hard to judge to nearest 0.01 second

Question 6

why shouldn’t you swirl once the reactants have mixed

Answer 6

so the depth of the solution doesnt change

Question 7

what would be the effect on the time taken of using a larger conical flask

Answer 7

it would take longer as the depth of solution is less

Question 8

why does a small increase in temperature cause a large increase in rate of reaction (2)

Answer 8

-more particles have activation energy
-frequency of successful collisions increases