A mint makes cupronickel containing seven parts copper for every three parts nickel by mass.
A batch contains 18 kg of nickel. No material is lost.
Four workers calculate the total mass of cupronickel in the batch.
| Worker | Calculated mass of cupronickel |
|---|---|
| P | 42 kg |
| Q | 54 kg |
| R | 60 kg |
| S | 126 kg |
Which worker is correct?
Worker Q
Worker S
Worker R
Worker P
136 exam-style questions on OCR GCSE Chemistry 6.1 Improving processes and products, covering 6.1.1 Extracting metals industrially and by electrolysis, 6.1.2 Life cycle assessment and recycling, 6.1.3 Biological methods of metal extraction, 6.1.4 The Haber process and the production of fertilisers, 6.1.5 Alloys and their uses, 6.1.6 Corrosion and its prevention, 6.1.7 Comparing and selecting materials, and 6.1.8 Industrial conditions, rate and position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.