1a) Name the gas being tested for. 1b) State the purpose of: i) Adding manganese(IV) oxide in step II. ii) Testing the gas with a glowing splint in step IV. 1c) State the observation in step IV and th

1a) Name the gas being tested for.
The gas being tested for is oxygen gas.

1b) State the purpose of:

• i) Adding manganese(IV) oxide in step II. Manganese(IV) oxide acts as a catalyst to speed up the decomposition of hydrogen peroxide, producing oxygen gas more rapidly.
• ii) Testing the gas with a glowing splint in step IV. This test is used to confirm the presence of oxygen gas, as oxygen gas rekindles a glowing splint.

1c) State the observation in step IV and the conclusion drawn from it.

• Observation: The glowing splint rekindles (bursts into flame).
• Conclusion: The gas collected is oxygen.

2a) Read and record:

• i) Weight ($W_1$) of the wood in air. $$W_1 = \boxed{2\, \text{N}}$$
• ii) Weight ($W_2$) of the wood in water. $$W_2 = \boxed{1\, \text{N}}$$

2b) Calculate:

• i) Apparent loss of weight of the wood in water.