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Monitoring chemical reactions

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Question 29

Lead is extracted by heating lead(II) oxide with carbon:

2\text{PbO} + \text{C} \rightarrow 2\text{Pb} + \text{CO}_2

Explain why this is an example of a redox reaction.

[2]

Calculate the mass of lead that can be made from $25$ tonnes of lead(II) oxide.

2\text{PbO} + \text{C} \rightarrow 2\text{Pb} + \text{CO}_2

Give your answer to 2 significant figures.

Relative atomic mass ( $A_r$ ): $Pb=207\text{Pb} = 207$ Relative formula mass ( $M_r$ ): $PbO=223\text{PbO} = 223$

[4]

Markscheme

Monitoring chemical reactions Questions

GCSE
Chemistry
Monitoring chemical reactions

91 exam-style questions on OCR GCSE Chemistry Monitoring chemical reactions. Each one has a worked solution and a mark scheme showing where the marks go.

Monitoring chemical reactions

Question bank

Monitoring chemical reactions

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

Question 29

Lead is extracted by heating lead(II) oxide with carbon:

2\text{PbO} + \text{C} \rightarrow 2\text{Pb} + \text{CO}_2

Explain why this is an example of a redox reaction.

[2]

Calculate the mass of lead that can be made from $25$ tonnes of lead(II) oxide.

2\text{PbO} + \text{C} \rightarrow 2\text{Pb} + \text{CO}_2

Give your answer to 2 significant figures.

Relative atomic mass ( $A_r$ ): $Pb=207\text{Pb} = 207$ Relative formula mass ( $M_r$ ): $PbO=223\text{PbO} = 223$

[4]

Markscheme

Monitoring chemical reactions Questions

GCSE
Chemistry
Monitoring chemical reactions

91 exam-style questions on OCR GCSE Chemistry Monitoring chemical reactions. Each one has a worked solution and a mark scheme showing where the marks go.