Extraction and uses of metals

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Question 10

Lead can be extracted from its ores, cerussite ( $PbCO3\text{PbCO}_3$ ) and galena ( $PbS\text{PbS}$ ).

Cerussite decomposes on heating to produce lead(II) oxide ( $PbO\text{PbO}$ ). The lead(II) oxide is then reduced by carbon in a furnace:

\text{PbO} + \text{C} \rightarrow \text{Pb} + \text{CO}

(i) Identify which species is reduced in this reaction, and explain your choice in terms of oxygen transfer.

[2]

When galena ( $PbS\text{PbS}$ ) is roasted in air, sulfur dioxide ( $SO2\text{SO}_2$ ) is produced as a waste gas. Write a chemical equation to show how sulfur dioxide reacts with water to form an acidic solution, and state one harmful effect of acid rain on the environment.

[2]

A mining company processes a sample of cerussite containing $g801\text{ g}$ of $PbCO3\text{PbCO}_3$ . Calculate the maximum mass of lead ( $Pb\text{Pb}$ ) that can be obtained from this sample. (Relative atomic masses: $Pb=207\text{Pb} = 207$ , $C=12\text{C} = 12$ , $O=16\text{O} = 16$ )

[3]

Lead can be extracted from its ores, cerussite ( $PbCO3\text{PbCO}_3$ ) and galena ( $PbS\text{PbS}$ ).

Cerussite decomposes on heating to produce lead(II) oxide ( $PbO\text{PbO}$ ). The lead(II) oxide is then reduced by carbon in a furnace:

\text{PbO} + \text{C} \rightarrow \text{Pb} + \text{CO}

(i) Identify which species is reduced in this reaction, and explain your choice in terms of oxygen transfer.

[2]

[3]

Extraction and uses of metals

Question 10

Markscheme

Extraction and uses of metals

Question 10

Markscheme

Extraction and uses of metals

Question 10

Extraction and uses of metals Questions

Extraction and uses of metals

Question 10

Extraction and uses of metals Questions