Photo AI
Copper forms two oxides, CuO and CuO - AQA - GCSE Chemistry - Question 8 - 2019 - Paper 1
Question 8
Copper forms two oxides, CuO and CuO. A teacher investigated an oxide of copper. Figure 10 shows the apparatus. This is the method used. 1. Weigh empty tube A. 2. ... show full transcript
Worked Solution & Example Answer:Copper forms two oxides, CuO and CuO - AQA - GCSE Chemistry - Question 8 - 2019 - Paper 1
Step 1
Step 2
Explain why the excess hydrogen must be burned off.
Answer
The excess hydrogen must be burned off to prevent it from escaping into the air, as hydrogen is flammable and can create a dangerous situation. This also ensures that the results of the experiment reflect only the reaction products.
Step 3
Step 4
Determine which is the correct equation for the teacher’s experiment.
Answer
Using the masses obtained: For equation 1 (Cu2O + H2 → 2 Cu + H2O):
- Moles of Cu = 0.04, moles of H2O from the 2.54 g of copper using molar mass calculations shows that this equation is valid, with a ratio of 1:1. Thus, it confirms that equation 1 is correct.