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Introducing chemical reactions

Introducing chemical reactions

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Question 37

A student investigates the highly exothermic reaction of solid sodium metal with excess liquid water to form an aqueous solution of sodium hydroxide and hydrogen gas. Which of the following chemical equations correctly represents this reaction, including the appropriate state symbols under standard laboratory conditions?

A
2Na(aq)+2H2O(l)→2NaOH(aq)+H2(g) 2\text{Na}(\text{aq}) + 2\text{H}_2\text{O}(\text{l}) \rightarrow 2\text{NaOH}(\text{aq}) + \text{H}_2(\text{g}) 2Na(aq)+2H2​O(l)→2NaOH(aq)+H2​(g)
B
2Na(s)+2H2O(aq)→2NaOH(aq)+H2(g) 2\text{Na}(\text{s}) + 2\text{H}_2\text{O}(\text{aq}) \rightarrow 2\text{NaOH}(\text{aq}) + \text{H}_2(\text{g}) 2Na(s)+2H2​O(aq)→2NaOH(aq)+H2​(g)
C
2Na(s)+2H2O(l)→2NaOH(aq)+H2(g) 2\text{Na}(\text{s}) + 2\text{H}_2\text{O}(\text{l}) \rightarrow 2\text{NaOH}(\text{aq}) + \text{H}_2(\text{g}) 2Na(s)+2H2​O(l)→2NaOH(aq)+H2​(g)
D
2Na(s)+2H2O(l)→2NaOH(l)+H2(g) 2\text{Na}(\text{s}) + 2\text{H}_2\text{O}(\text{l}) \rightarrow 2\text{NaOH}(\text{l}) + \text{H}_2(\text{g}) 2Na(s)+2H2​O(l)→2NaOH(l)+H2​(g)
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Introducing chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /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.

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