Figure 5 shows a sample of hydrogen peroxide solution decomposing to form water and oxygen gas - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2021 - Paper 1
Question 4
Figure 5 shows a sample of hydrogen peroxide solution decomposing to form water and oxygen gas.
(a) (i) Write the word equation for hydrogen peroxide solution decom... show full transcript
Worked Solution & Example Answer:Figure 5 shows a sample of hydrogen peroxide solution decomposing to form water and oxygen gas - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2021 - Paper 1
Step 1
Write the word equation for hydrogen peroxide solution decomposing.
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Answer
The word equation for the decomposition of hydrogen peroxide solution is:
Hydrogen peroxide → Water + Oxygen
Step 2
In this reaction hydrogen peroxide is a solution, water is a liquid and oxygen is a gas. Draw one straight line from each substance to its correct state symbol.
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Answer
Substance
State Symbol
Hydrogen peroxide solution
(aq)
Liquid water
(l)
Oxygen gas
(g)
Step 3
Describe the test to show the gas produced is oxygen.
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Answer
To test for the presence of oxygen gas, you can use a glowing splint. When the glowing splint is brought near to the gas, if it reignites, this indicates that the gas produced is oxygen.
