PowerPoint Chemistry

1. TOPIC 1. LAB ACTIVITY 2 THE EFFECT OF TEMPERATURE CHANGES ON REACTION RATE Silvia Jiménez Álvarez (1º batx.)

4. 100 cm³ glassbeakers

5. Timer

6. Thermometer

7. 600 cm³ beaker

8. Heater

9. 0,2M oxalicacid

10. 1M sulphuricacid

11. 0,02 potassiumpermanganate

13. PROCEDURE: Usingsyringesadd 5 cm³ of sulphuricacid, 2 cm³ of potassiumpermanganatesolution and 40 cm³ of waterto a 100 cm³ dry, glassbeaker. Heatthe mixture toabout 40°,50°,60°, 70° Place thebeakeron a whitetable. Add 1 cm³ of oxalicacidtothe mixture in thebeaker as soon as possible and at thesame time startthetimer. Gentlystirthereaction mixture withthethermometer. Whenthereaction mixture turnscolourlessstop thetimer and record the time (in seconds). Measure and record thetemperature of thereactionmixture. Workoutthereactionrate.

14. 2. 3.

15. Change of Colour:

16. Activities: 1. Statetheaim of theexperiment: Theaim of theexperimentisto determine whethertherate of thisreactionisconsistentwiththetemperature. 2. Statetwofactorswhichhadtobekeptconstant in theexperiment: Wehadtokeepconstantthevolume of thereactants and thepressure of theglass. 3. Howwastherate of thereactiondetermined? Itwasdeterminedbythetemperature of thesolution, ifthetemperature of thesolutionwashigherthantherate of reactionincreased.

17. 4. Present your results in tabular form: 5. Work out the rate of each reaction and add these to your results table. 135 40

18. 6. Draw a line graph of reaction rate/s¯¹ against temperature/°C.

19. 7. Statetheconclusion of theexperiment. In conclusion we can state that the higher the temperature the quicker the reaction rate and thus the quicker we have a change in color.