Liquid carbon dioxide does not conduct electricity. What might this tell us about it?
27%
It is a gas
20%
It is colorless
40%
It is a covalently compound substance
13%
It is an ionically compound substance
Q.2.
Which of the following diagrams best represents a molecule of carbon dioxide?
0%
C=O=O
0%
C-O-O
29%
O-C-O
71%
O=C=O
Q.3.
What do the lines represent on covalent bonding diagrams, such as in question 2?
10%
Electrons belonging to the oxygen atoms
20%
Electrons belonging to the carbon atom
60%
Pairs of electrons shared by both the carbon and the oxygen
10%
Electrons transferred from the carbon to the oxygen
Q.4.
Which one of the following reactions would produce carbon dioxide?
67%
Hydrochloric acid and copper carbonate
22%
Carbonic acid and zinc oxide
11%
Water and lithium carbonate
0%
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 __________.
Which of the following human activities increase the natural concentration of carbon dioxide in the air?
33%
Driving gasoline and diesel powered vehicles
33%
Making cement
0%
Manufacture of iron and steel
33%
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?
25%
The hole in the ozone layer
50%
Global warming
0%
Pollution
25%
All of the above
Q.8.
What is the test for carbon dioxide and what result would you get?
33%
Litmus paper - blue
0%
Lighted splint - squeaky pop
33%
moist pH paper - orange
33%
Limewater - cloudy
Q.9.
What is the compound produced in the test for carbon dioxide?
50%
Calcium carbonate
0%
Calcium hydroxide
0%
Calcium chloride
50%
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 gasses are thought to have been present in small quantities?
0%
It came from comets and oxygen and nitrogen were also present
33%
It came from asteroids and ammonia and methane were also present
0%
It came from the Sun and oxygen and methane were also present
67%
It came from volcanoes and ammonia and methane were also present
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