A teacher investigates the chemical properties and reactions of copper carbonate, CuCO3\text{CuCO}_3CuCO3.
The flowchart shows the sequence of reactions carried out by the teacher.
State the name of the soluble salt, X.
State the name of gas Y.
Gas Z bleaches damp blue litmus paper. State the name of gas Z.
The teacher performs a flame test on the copper metal. What colour flame does the teacher observe?
Zinc metal is extracted from zinc oxide by heating with carbon as shown in the word equation:
zinc oxide+carbon→zinc+carbon dioxide\text{zinc oxide} + \text{carbon} \rightarrow \text{zinc} + \text{carbon dioxide}zinc oxide+carbon→zinc+carbon dioxide
Explain why zinc can be extracted in this way. Use ideas about the reactivity series.
Metals are often mixed with other elements to make alloys. The table gives information about some common alloys.
| Alloy | Main elements | Uses |
|---|---|---|
| brass | copper and ........................ | musical instruments and plumbing |
| bronze | copper and ........................ | statues and medals |
| high-carbon steel | iron and carbon | ........................ |
Complete the table.