The proportion of gold in an alloy is measured in carats:
Table 1 shows information about two gold rings, C and D, containing only gold and copper.
Complete Table 1 by finding the missing values represented by the question marks.
| Gold ring | Carat | Mass of gold in grams | Mass of copper in grams |
|---|---|---|---|
| C | ? | 6 | 18 |
| D | 9 | 9 | ? |
18 exam-style questions on AQA GCSE Chemistry 10.3 Using materials, covering 10.3.1 Corrosion and its prevention, 10.3.2 Alloys as useful materials, and 10.3.3 Ceramics, polymers and composites. Each one has a worked solution and a mark scheme showing where the marks go.