Peka Form 5 2 (Exp No 1.3)

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Exp No: 1.3

Topic : Rate of Reaction

Aim 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 : Temperature of sodium thiosulphate solution Responding variable : 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] 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. 50 cm3 of 0.2 mol dm-3 sodium thiosulphate solution is measured using

measuring cylinder and poured into a conical flask. 2. The temperature of the solution is measured with a thermometer. 3. The conical flask is placed on a white paper marked`X`. 4. 5 cm3 of 1 mol dm-3 sulphuric acid is measured using measuring cylinder. 5. The acid is quickly poured into the sodium thiosulphate solution. 6. The stopwatch is started immediately and the conical flask is swirled. 7. The mark `X` is viewed from above. 8. The stopwatch is stopped as soon the mark disappear from sight. 9. Time taken is recorded. 10. 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]



Recorded Data

Set Temperature/0C Time/s 1/Time /s-1

I 30.0 55 0.018

II 40.0 36 0.028

II 50.0 23 0.043

IV 60.0 17 0.059

V 70.0 13 0.077

[ K1PP1(v) Able to tabulate the data ] [ K3PP1 Able to construct a table with row consists of headings and units

correctly ] [ K3PP2 Able to write a reading of the Temperature, Time and 1/Time with

one decimal place] [ K3PP3 Able to write all the readings of the Temperature, Time and 1/Time

with correct and consistent decimal places] Communication Plotted Graph Temp vs Time

Temp / oC

Time /s



Temp vs 1/Time

[K4PP1- Able to draw a graph correctly] Interpreting data 1. 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.

2. Temperature is inversely propotional to time taken 3. Base on the graph temperature vs 1/time , when the temperature increase, rate

of reaction increase. 4. Temperature is directly propotional to rate of reaction K4PP2 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 Conclusion 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]

END

Temp / oC

1/time

Peka Form 5 2 (Exp No 1.3)

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