IGCSE CHEMISTRY Word Scramble

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Question	Answer
A new planet has been discovered and its atmosphere has been analysed. Which gases are present in the atmosphere of the planet in a higher percentage than they are in the Earth’s atmosphere?	Carbon dioxide only
Which pollutant found in air does not have an effect on respiration?	Lead compounds
Sulfur dioxide, carbon monoxide and oxides of nitrogen are common gaseous pollutants found in the air. Which pollutants contribute to acid rain?	Oxides of nitrogen and sulfur dioxide
The following substances can be formed when petrol is burnt in a car engine. Which substance is the main cause of acid rain?	Water
Which is a use of oxygen?	To react with methane in a Bunsen burner
Carbon monoxide is an air pollutant produced when petrol is burned in a car engine. Why is carbon monoxide considered to be an air pollutant?	It is poisonous
A farmer moves his cows into a concrete shelter for protection. There is little access for fresh air once the door is closed. Which gases would increase in amount in the shelter?	Carbon dioxide and methane
Which gas is not found in clean air?	Carbon monoxide
The pollutants released into the air from car exhausts and some power stations include oxides of the type XO and YO2. What are X and Y?	X - carbon and nitrogen Y - carbon, nitrogen and sulfur
Name three statements about rusting?	1. Painting can stop iron gates rusting. 2. Rust is hydrated iron(III) oxide. 3. Water and oxygen are both needed for rusting.
A steel bicycle which had been left outdoors for several months was starting to rust. What would not reduce the rate of corrosion?	Remove the rust and wipe the bicycle with a clean damp cloth
Oxygen is a reactive element. Shows which of oxygen’s reactions are useful	Fuel combustion Steel manufacture
Which method is used for rust prevention?	1. coating working parts of industrial machinery with oil 2 covering wire for gardening use with plastic 3. painting car bodies
Name three gases that is an atmospheric pollutant?	1 carbon monoxide 2 nitrogen dioxide 3 sulfur dioxide
A sample of air from a town centre was analysed and found to contain mainly nitrogen and oxygen, but also traces of the four gases below. Name a gas that is a pollutant?	Sulfur dioxide
Which reaction involves oxidation?	Rusting of iron
Which is an air pollutant that affects a part of the body other than the lungs and blood system?	Lead compounds
Four steel paper clips are treated as described before being placed in a beaker of water. Which paper clip rusts most quickly?	Washed with soap and rinsed
A piece of uncoated iron and three pieces of iron with various coatings were left exposed to the air. Which piece of iron would rust?	The uncoated piece
Acid rain is formed when sulfur dioxide and oxides of nitrogen dissolve in rain water. Which problem is not caused by acid rain?	Breathing difficulties
Which air pollutant is not made when coal burns in a power station?	Lead compounds
Oxides of nitrogen are given out from car exhausts. Shows why oxides of nitrogen are unwanted	Acidic and Toxic are involved
A factory burns coal with a high sulfur content. Which pollutant is most likely to lead to the death of trees?	Sulfur dioxide
What is the correct order of abundance of the gases in the air?	nitrogen → oxygen → argon → carbon dioxide
Argon is a noble gas used to fill light bulbs. What is the approximate percentage of argon in air?	1 %
Coal is a fossil fuel. Which gas is not formed when coal burns?	Methane
Which is a use of oxygen?	Making steel
True or false: Alloying iron with other materials to form stainless steel prevents iron from rusting by excluding oxygen	False
True or false: Painting, oiling and electroplating are all methods of preventing iron from rusting	True
Which pollutant, found in car exhaust fumes, does not come from the fuel?	Lead compounds
Which compound in polluted air can damage stonework and kill trees?	Sulfur dioxide
True or false; Carbon monoxide is responsible for the production of ‘acid rain’.	False
True or false: Oxides of nitrogen are present in car exhausts.	True
True or false; Sulfur dioxide can be produced by the combustion of fossil fuels.	True
Substance K reacts with sodium carbonate to form a gas. The gas turns limewater cloudy. What is substance K and which process takes place in the reaction?	K are hydrochloric acid and the process are neutralisation
Name three statements about methane?	1 It is a greenhouse gas. 2 It is formed by decomposition of vegetation. 3 It is used as a fuel.
Which process does not produce carbon dioxide?	Reaction of an alkali with a carbonate
Carbon dioxide and methane both contribute to climate change. Which process produces both gases?	Farming cattle
In which reaction is carbon dioxide not produced?	Hydrochloric acid reacting with magnesium
Unwanted vegetation is sometimes placed in a bin where it decays to form compost. This compost can be used to fertilise soils. Which gas is likely to be present in a higher percentage inside the bin than in the air outside the bin?	Methane
Carbon dioxide and methane are ‘greenhouse gases’ which contribute to global warming. Which process does not increase global warming?	Growing crops such as sugar cane
Name three statements about a gas?	1 It is produced by thermal decomposition of a carbonate. 2 It is produced by the fermentation of glucose. 3 It is produced during the production of steel from iron
Which four reactions produce carbon dioxide?	1 respiration 2 fermentation 3 combustion of methane 4 manufacture of lime
Gas X is a waste gas from digestion in animals. Gas Y is formed when gas X is burnt with a small amount of oxygen. Gas Z is formed when gas X is burnt with an excess of oxygen. What are X, Y and Z?	X - methane Y - carbon monoxide Z - carbon dioxide
Name four experiments carried out with calcium carbonate?	1 acid added 2 alkali added 3 heated strongly 4 water added
Name three statements about methane?	1 It is produced as vegetation decomposes. 2 It is produced by animals, such as cows. 3 It is used as a fuel
Which pollutant gas is produced by the decomposition of vegetation?	Methane
In which process is carbon dioxide not formed?	Heating lime
Shows four methods that were suggested for the formation of carbon dioxide	1 Action of an alkali on a carbonate 2 Action of heat on a carbonate 3 Complete combustion of methane 4 Reaction of a carbonate with oxygen
How does carbon dioxide formed? Name 2 points.	1 During respiration 2 When calcium carbonate reacts with hydrochloric acid

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