To investigate the effect of temperature on the rate of reaction.
Problem statement
How does temperature affect the rate of reaction? [ K1PP1(i) - Able to write the aim or problem statement correctly]
Hypothesis
The higher the temperature of the reactant, the higher the the rate of reaction.
Variables
Manipulated variable Responding variable
Materials
0.2 mol dm-3 250 cm3 sodium thiosulphate solution, 1.0 mol dm-3 25 cm3 sulphuric acid, white paper marked `X` at the centre
Apparatus
50 cm3 measuring cylinder, 10 cm3 measuring cylinder, 150 cm3 conical flask, stop watch,thermometer,bunsen burner,tripod stand and wire gauze.
Procedure
1.
Temperature of sodium thiosulphate solution Time taken for the cross `X` to disappear from the sight. Controlled variable : Concentration and volume of both dilute sulphuric acid and sodium thiosulphate solution [ K1PP1(ii) - Able to write the hypothesis or variables correctly]
2. 3. 4. 5. 6. 7. 8. 9. 10.
: :
50 cm3 of 0.2 mol dm-3 sodium thiosulphate solution is measured using measuring cylinder and poured into a conical flask. The temperature of the solution is measured with a thermometer. The conical flask is placed on a white paper marked`X`. 5 cm3 of 1 mol dm-3 sulphuric acid is measured using measuring cylinder. The acid is quickly poured into the sodium thiosulphate solution. The stopwatch is started immediately and the conical flask is swirled. The mark `X` is viewed from above. The stopwatch is stopped as soon the mark disappear from sight. Time taken is recorded. Steps 1 to 9 are repeated by using the different temperature of sodium thiosulphate solution at 400C, 500C, 600C and 700C [ K1PP1(iv) - Able to write the procedure correctly]
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Recorded Data Set I II II IV V [ K1PP1(v) [ K3PP1
Time/s
30.0 40.0 50.0 60.0 70.0
55 36 23 17 13
1/Time /s-1 0.018 0.028 0.043 0.059 0.077
Able to tabulate the data ] Able to construct a table with row consists of headings and units correctly ] Able to write a reading of the Temperature, Time and 1/Time with one decimal place] Able to write all the readings of the Temperature, Time and 1/Time with correct and consistent decimal places]
[ K3PP2 [ K3PP3
Communication
Temperature/0C
Plotted Graph Temp vs Time o
Temp / C
Time /s
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Http://chemclass4spm.blogspot.com
Temp vs 1/Time o
Temp / C
1/time
[K4PP1- Able to draw a graph correctly] Interpreting data
1.
2. 3. 4.
Base on the graph temperature vs time taken, when the temperature of sodium thiosulphate increase, the time taken to mark X dissapear is shorter. It shows the reaction is faster. Temperature is inversely propotional to time taken Base on the graph temperature vs 1/time , when the temperature increase, rate of reaction increase. Temperature is directly propotional to rate of reaction
K4PP2
Conclusion
Able to 1. determine the values of the reciprocal of time for sets I to V 2. deduce from the graphs 3. state the relationship between the rate of reaction and the temperature of sodium thiosulphate solution correctly
The higher the temperature of the reactant, the higher the the rate of reaction. Hypothesis is accepted [K4PP3- Able to state the hypothesis is accepted or rejected]
