Q.1
Liquid carbon dioxide does not conduct electricity. What might this tell us about it?
  • It is a gas
  • It is colourless
  • It is a covalently compound substance
  • It is an ionically compound substance
Q.2
Which of the following diagrams best represents a molecule of carbon dioxide?
  • C=O=O
  • C-O-O
  • O-C-O
  • O=C=O
Q.3
What do the lines represent on covalent bonding diagrams, such as in question 2?
  • Electrons belonging to the oxygen atoms
  • Electrons belonging to the carbon atom
  • Pairs of electrons shared by both the carbon and the oxygen
  • Electrons transferred from the carbon to the oxygen
Q.4
Which one of the following reactions would produce carbon dioxide?
  • Hydrochloric acid and copper carbonate
  • Carbonic acid and zinc oxide
  • Water and lithium carbonate
  • Sodium hydroxide and calcium carbonate
Q.5
Choose the correct words in the correct order that would fill the gaps: There is a natural and balanced ___________ of carbon dioxide between the __________ and the biosphere. Plants remove it by the process of __________. Animals (and plants during the night) return carbon dioxide to the air by the process of __________.
  • exchange, atmosphere, respiration, photosynthesis
  • exchange, atmosphere, photosynthesis, respiration
  • atmosphere, photosynthesis, exchange , respiration
  • plants, animals, carbon, dioxide
Q.6
Which of the following human activities increase the natural concentration of carbon dioxide in the air?
  • Driving petrol and diesel powered vehicles
  • Making cement
  • Manufacture of iron and steel
  • All of the above
Q.7
Which of the following environmental issues is strongly linked to higher than normal levels of carbon dioxide in the atmosphere?
  • The hole in the ozone layer
  • Global warming
  • Pollution
  • All of the above
Q.8
What is the test for carbon dioxide and what result would you get?
  • Litmus paper - blue
  • Lighted splint - squeaky pop
  • moist pH paper - orange
  • Limewater - cloudy
Q.9
What is the compound produced in the test for carbon dioxide?
  • Calcium carbonate
  • Calcium hydroxide
  • Calcium chloride
  • Calcium sulfate
Q.10
It is thought that the Earth's early atmosphere was mainly carbon dioxide. But where do most scientists believe it came from and which other gases are thought to have been present in small quantities?
  • It came from comets and oxygen and nitrogen were also present
  • It came from asteroids and ammonia and methane were also present
  • It came from the Sun and oxygen and methane were also present
  • It came from volcanoes and ammonia and methane were also present
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