Joanna van Dyk
Quiz by , created almost 4 years ago

Some mixed exam-like Qs

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Joanna van Dyk
Created by Joanna van Dyk almost 4 years ago
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Question 1

Question
Oxygen can be produced by the decomposition of hydrogen peroxide (H2O2). What is the equation for this reaction?
Answer
  • 2H2O2 = O2 +2H2O
  • H2O2 = 2O + H2
  • 2H2O2 + CO2 = HCO3 + H2 + H2O

Question 2

Question
Oxygen can be produced by the decomposition of hydrogen peroxide (H2O2). What is a suitable catalyst for this reaction?
Answer
  • Manganese oxide
  • Phosphorus
  • Sulphur Dioxide
  • Lead Nitrate

Question 3

Question
Oxygen can be produced by the decomposition of hydrogen peroxide (H2O2). What is the percentage of oxygen in air at atmospheric pressure
Answer
  • 21%
  • 78%
  • 0.04%
  • 1%

Question 4

Question
Other elements can combust in oxygen. Write a balanced equation for the combustion of sulphur.
Answer
  • S + O2 = SO2
  • S + O2 = SO4
  • S + O2 = SO + H2O

Question 5

Question
SO2 dissolves in rainwater to form an acidic solution.
Answer
  • True
  • False

Question 6

Question
Write a balanced equation for the combustion of hydrogen: [blank_start]2[blank_end]H2 + O2 = 2[blank_start]H2O[blank_end]
Answer
  • 2
  • H2O

Question 7

Question
Select two uses for carbon dioxide:
Answer
  • fizzy drinks
  • fire extinguishers
  • sterilization
  • laughing gas