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Monitoring chemical reactions

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Question 56

Tungsten is extracted from tungsten(VI) oxide by heating it with hydrogen gas:

\text{WO}_3 + 3\text{H}_2 \rightarrow \text{W} + 3\text{H}_2\text{O}

Explain why this is an example of a redox reaction.

[2]

Calculate the mass of tungsten that can be made from $45$ tonnes of tungsten(VI) oxide.

\text{WO}_3 + 3\text{H}_2 \rightarrow \text{W} + 3\text{H}_2\text{O}

Give your answer to 2 significant figures.

Relative atomic mass ( $A_r$ ): $W=184\text{W} = 184$ Relative formula mass ( $M_r$ ): $WO3=232\text{WO}_3 = 232$

[3]

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

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Monitoring chemical reactions

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Question 56

Tungsten is extracted from tungsten(VI) oxide by heating it with hydrogen gas:

\text{WO}_3 + 3\text{H}_2 \rightarrow \text{W} + 3\text{H}_2\text{O}

Explain why this is an example of a redox reaction.

[2]

Calculate the mass of tungsten that can be made from $45$ tonnes of tungsten(VI) oxide.

\text{WO}_3 + 3\text{H}_2 \rightarrow \text{W} + 3\text{H}_2\text{O}

Give your answer to 2 significant figures.

Relative atomic mass ( $A_r$ ): $W=184\text{W} = 184$ Relative formula mass ( $M_r$ ): $WO3=232\text{WO}_3 = 232$

[3]

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.