A student electrolyses dilute sulfuric acid and measures the volume of hydrogen gas produced at the cathode over time.
The table below shows their results:
| Time (minutes) | Volume of hydrogen (cm3\text{cm}^3cm3) |
|---|---|
| 0 | 0.0 |
| 4 | 6.0 |
| 8 | 12.0 |
| 12 | 18.0 |
| 16 | 32.0 |
| 20 | 30.0 |
One of the results in the table is anomalous. State the time (in minutes) at which this anomalous result was recorded.
Using the remaining, non-anomalous data, calculate the rate of hydrogen gas production in cm3/min\text{cm}^3/\text{min}cm3/min.
Dilute copper(II) sulfate solution contains the following particles:
H+Cu2+OH−SO42−H2O\text{H}^+ \quad \text{Cu}^{2+} \quad \text{OH}^- \quad \text{SO}_4^{2-} \quad \text{H}_2\text{O}H+Cu2+OH−SO42−H2O
Which of these particles are attracted to the positive electrode (anode)?
Complete the following statements about the electrolysis of molten salts:
Practise OCR GCSE Chemistry Electrolysis with exam-style questions for Foundation and Higher tier. 45 questions, matched to the OCR GCSE Chemistry (J248) specification and written in Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.