A student heats a sample of copper(II) carbonate in a crucible and records the mass of the remaining solid at regular intervals. The results are shown in the table below.
| Time (minutes) | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|---|
| Mass of solid remaining (g) | 12.0 | 10.5 | 9.2 | 8.3 | 7.6 | 7.1 | 6.8 |
State why it is impossible to be sure from this data that the reaction is complete.
258 exam-style questions on Edexcel GCSE Chemistry Calculations involving masses. Each one has a worked solution and a mark scheme showing where the marks go.