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Monitoring chemical reactions

Monitoring chemical reactions

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Question 43

In an experiment to monitor the thermal decomposition of a raising agent, a student heats 42.0 g of sodium hydrogencarbonate, NaHCO3(s)\text{NaHCO}_3(\text{s})NaHCO3​(s), in an open crucible until the reaction is complete:

2NaHCO3(s)→Na2CO3(s)+CO2(g)+H2O(g) 2\text{NaHCO}_3(\text{s}) \rightarrow \text{Na}_2\text{CO}_3(\text{s}) + \text{CO}_2(\text{g}) + \text{H}_2\text{O}(\text{g}) 2NaHCO3​(s)→Na2​CO3​(s)+CO2​(g)+H2​O(g)

Calculate the expected decrease in the mass of the solid sample.

(Relative atomic masses: H=1.0\text{H} = 1.0H=1.0, C=12.0\text{C} = 12.0C=12.0, O=16.0\text{O} = 16.0O=16.0, Na=23.0\text{Na} = 23.0Na=23.0)

A

11.0 g11.0\text{ g}11.0 g

B

15.5 g15.5\text{ g}15.5 g

C

26.5 g26.5\text{ g}26.5 g

D

31.0 g31.0\text{ g}31.0 g

Markscheme

Monitoring chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /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.

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