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4.1 Predicting chemical reactions

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Question 37

When sodium is cut, the shiny surface tarnishes quickly because sodium reacts with oxygen in the air to form sodium oxide, Na2O\mathrm{Na_{2}O}Na2​O.

The balanced symbol equation for this reaction has a number missing from each gap.

…Na+O2→…Na2O\mathrm{\ldots Na + O_{2} \rightarrow \ldots Na_{2}O}…Na+O2​→…Na2​O

Which numbers complete the balanced equation?

[1]
A

2 in front of Na and 2 in front of Na2O\mathrm{Na_{2}O}Na2​O

B

1 in front of Na and 2 in front of Na2O\mathrm{Na_{2}O}Na2​O

C

4 in front of Na and 2 in front of Na2O\mathrm{Na_{2}O}Na2​O

D

2 in front of Na and 1 in front of Na2O\mathrm{Na_{2}O}Na2​O

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4.1 Predicting chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /4.1 Predicting chemical reactions

113 exam-style questions on OCR GCSE Chemistry 4.1 Predicting chemical reactions, covering 4.1.1 Properties and trends in Groups 1, 7 and 0, 4.1.2 Properties of the transition metals, 4.1.3 Reactivity predicted from position in the Periodic Table, and 4.1.4 Reactivity of metals and the reactivity series. Each one has a worked solution and a mark scheme showing where the marks go.

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