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Introducing chemical reactions

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Question 18

Aluminium reacts with oxygen gas at high temperatures to form a protective layer of aluminium oxide. Which of the following represents the correctly balanced chemical equation for this reaction?

$4Al+3O2→2Al2O34\text{Al} + 3\text{O}_2 \rightarrow 2\text{Al}_2\text{O}_3$

$2Al+3O2→Al2O32\text{Al} + 3\text{O}_2 \rightarrow \text{Al}_2\text{O}_3$

$2Al+3O→Al2O32\text{Al} + 3\text{O} \rightarrow \text{Al}_2\text{O}_3$

$Al+O2→AlO2\text{Al} + \text{O}_2 \rightarrow \text{AlO}_2$

Markscheme

Introducing chemical reactions Questions

GCSE
Chemistry
Introducing chemical reactions

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

Introducing chemical reactions

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Introducing 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

Question 18

Aluminium reacts with oxygen gas at high temperatures to form a protective layer of aluminium oxide. Which of the following represents the correctly balanced chemical equation for this reaction?

$4Al+3O2→2Al2O34\text{Al} + 3\text{O}_2 \rightarrow 2\text{Al}_2\text{O}_3$

$2Al+3O2→Al2O32\text{Al} + 3\text{O}_2 \rightarrow \text{Al}_2\text{O}_3$

$2Al+3O→Al2O32\text{Al} + 3\text{O} \rightarrow \text{Al}_2\text{O}_3$

$Al+O2→AlO2\text{Al} + \text{O}_2 \rightarrow \text{AlO}_2$

Markscheme

Introducing chemical reactions Questions

GCSE
Chemistry
Introducing chemical reactions

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