This question is about the extraction of metals.
When lead oxide is heated with carbon, lead is made.
Complete the word equation for this reaction.
lead oxide+carbon→…………………………+………………………… \text{lead oxide} + \text{carbon} \rightarrow \text{\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots} + \text{\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots} lead oxide+carbon→…………………………+…………………………Lead oxide is reduced during this reaction.
Explain how you can tell that lead oxide is reduced.
Look at the reactivity series of some metals. Carbon is also included.
Lead is usually extracted from lead oxide by heating lead oxide with carbon.
Explain why. Use the reactivity series to help you.
Magnesium is extracted from magnesium oxide by electrolysis.
Explain why. Use the reactivity series to help you.
The table shows some information about aluminium and copper.
| Metal | Cost of 1 kg (£) | Amount in Earth's crust (%) |
|---|---|---|
| Aluminium | 1.50 | 8.2 |
| Copper | 6.80 | 0.0060 |
Suggest two reasons why it could be more important to recycle copper than aluminium. Use information from the table to help you.
Bronze is an alloy often used to make statues and medals.
A sample of a bronze alloy contains 2.45 g2.45\text{ g}2.45 g of tin and 32.80 g32.80\text{ g}32.80 g of copper only.
Calculate the percentage of tin in this alloy.
Give your answer to 3 significant figures.
81 exam-style questions on OCR GCSE Chemistry Improving processes and products. Each one has a worked solution and a mark scheme showing where the marks go.