Complete the general word equation for the thermal decomposition of a metal carbonate:
metal carbonate→metal oxide+…………… \text{metal carbonate} \rightarrow \text{metal oxide} + \dots\dots\dots\dots\dots metal carbonate→metal oxide+……………A student heats green copper(II) carbonate powder in a crucible.
What is the chemical name of the metal oxide made in this reaction?
A student heats green copper(II) carbonate powder in a crucible.
The student records the total mass of the crucible and its contents every 2 minutes on a balance to monitor how much gas escapes. The results are shown in the table below:
| Time (minutes) | Mass (g) |
|---|---|
| 0 | 64.35 |
| 2 | 61.20 |
| 4 | 59.45 |
| 6 | 58.12 |
| 8 | 57.50 |
| 10 | 57.50 |
How much carbon dioxide gas is made after 6 minutes?
The student wishes to obtain a pure sample of the copper oxide and repeats the thermal decomposition 4 times to measure the final yield of the black powder. The results are shown below:
| Experiment number | Mass of copper oxide (g) |
|---|---|
| 1 | 8.34 |
| 2 | 7.95 |
| 3 | 8.12 |
| 4 | 8.41 |
Calculate the mean mass of copper oxide produced. Give your answer to 3 significant figures.
55 exam-style questions on OCR GCSE Chemistry Types of chemical reactions. Each one has a worked solution and a mark scheme showing where the marks go.