Experiment 7.4:
Aim: To investigate the effect of catalyst on the rate of reaction.
Problem statement: How does the presence of catalyst affect the rate of reaction?
Hypothesis: Presence of catalyst increases the rate of reaction.
Variables:
(a) Manipulated : Presence of catalyst
(b) Responding : Rate of reaction
(c) Fixed : Mass of manganese(IV) oxide, MnO2, temperature and volume of hydrogen peroxide solution, H2O2
Materials: 20-volume hydrogen peroxide solution, H22O2, manganese(IV) oxide powder, MnO2 and distilled water
Apparatus: 10 cm3 measuring cylinder, test tubes, test tube rack, glowing wooden splinter, filter funnel, filter paper, 150 cm3 beaker, spatula and electronic balance
Procedure:
1. Label two test tubes as I and II.
2. Put 5 cm3 hydrogen peroxide solution, H2O2 into test tube I and test tube II separately.
3. Place the two test tubes in the test tube rack.
4. Add 0.5 g manganese(IV) oxide powder, MnO2 into test tube II. Place a glowing wooden splinter into the mouth of both test tubes quickly.
5. Observe the changes that occur to the wooden splinter and record your observations.
Conclusion:
Is the hypothesis acceptable? What is the conclusion of this experiment?
Discussion:
1. What are the changes observed and measured in this experiment?
2. Explain how the observation in (1) can assure your hypothesis.
Answer:
Discussion:
1. The release of oxygen gas can rekindle a glowing wooden splinter. The time for oxygen gas to rekindle a glowing wooden splinter.
2. The faster the glowing wooden splinter is rekindled, the higher the rate of reaction.
Aim: To investigate the effect of catalyst on the rate of reaction.
Problem statement: How does the presence of catalyst affect the rate of reaction?
Hypothesis: Presence of catalyst increases the rate of reaction.
Variables:
(a) Manipulated : Presence of catalyst
(b) Responding : Rate of reaction
(c) Fixed : Mass of manganese(IV) oxide, MnO2, temperature and volume of hydrogen peroxide solution, H2O2
Materials: 20-volume hydrogen peroxide solution, H22O2, manganese(IV) oxide powder, MnO2 and distilled water
Apparatus: 10 cm3 measuring cylinder, test tubes, test tube rack, glowing wooden splinter, filter funnel, filter paper, 150 cm3 beaker, spatula and electronic balance
Procedure:
1. Label two test tubes as I and II.
2. Put 5 cm3 hydrogen peroxide solution, H2O2 into test tube I and test tube II separately.
3. Place the two test tubes in the test tube rack.
4. Add 0.5 g manganese(IV) oxide powder, MnO2 into test tube II. Place a glowing wooden splinter into the mouth of both test tubes quickly.
5. Observe the changes that occur to the wooden splinter and record your observations.
Conclusion:
Is the hypothesis acceptable? What is the conclusion of this experiment?
Discussion:
1. What are the changes observed and measured in this experiment?
2. Explain how the observation in (1) can assure your hypothesis.
Answer:
Discussion:
1. The release of oxygen gas can rekindle a glowing wooden splinter. The time for oxygen gas to rekindle a glowing wooden splinter.
2. The faster the glowing wooden splinter is rekindled, the higher the rate of reaction.