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Rates of reaction

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Question 79

Hydrogen peroxide decomposes in the presence of a manganese(IV) oxide catalyst to produce water and oxygen gas.

2H2O2(aq)→MnO22H2O(l)+O2(g) 2\text{H}_2\text{O}_2(\text{aq}) \xrightarrow{\text{MnO}_2} 2\text{H}_2\text{O}(\text{l}) + \text{O}_2(\text{g}) 2H2​O2​(aq)MnO2​​2H2​O(l)+O2​(g)

A student wants to determine the rate of reaction by measuring the volume of oxygen gas produced over a five-minute period. Initially, the student tries to measure this by counting the bubbles of gas released. However, the reaction is too rapid and the bubbles cannot be counted accurately.

Figure 1 shows the open conical flask in which the decomposition is taking place.

Figure 1: Open conical flask containing hydrogen peroxide solution and manganese(IV) oxide catalyst.

Describe how the apparatus in Figure 1 can be modified and completed to collect and measure the volume of oxygen gas produced accurately.

[2]

Rates of reaction Questions

  1. GCSE
  2. /Chemistry
  3. /Rates of reaction

Practise Edexcel GCSE Chemistry Rates of reaction with exam-style questions for Foundation and Higher tier. 166 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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