1、Some students are asked to describe differences between gases and liquids.
Three of their suggestions are:
1、gas molecules are further apart;
2、gas molecules are smaller;
3、liquid molecules vibrate around fixed positions.
Which suggestions are correct?
A 1 only B 2 only
C 3 only D 1, 2 and 3
2、The compound ethyl mercaptan, C2H5SH, has a very unpleasant smell.
What is its relative molecular mass?
A 34 B 50 C 61 D 62
3、When it is used as a fuel, hydrogen combines with substance X.What is X?
A carbon B methane C nitrogen D oxygen
4、Which process is endothermic?
A adding water to anhydrous copper(II) sulphate B burning magnesium to make the oxide
C heating water to make steam D neutralising acidic industrial waste
5、An aqueous solution contains either aluminium sulphate or zinc sulphate.
Which aqueous reagent can be used to confirm which salt is present?
A ammonia B barium chloride C sodium hydroxide D sulphuric acid
6、Which property do all metals have?
A They are hard.
B They conduct electricity.
C They form acidic oxides.
D They react with water.
7、Haematite is reduced to iron in the blast furnace.
haematite + carbon monoxide →iron + X What is X?
A carbon B carbon dioxide C hydrogen D oxygen
8、Which object is least likely to contain aluminium?
A a bicycle frame B a hammer C a saucepan D an aeroplane body
9、Which two gases produced from the burning of petrol in motor vehicles contribute to the formation of acid rain?
A carbon dioxide and carbon monoxide B carbon monoxide and sulphur dioxide
C carbon monoxide and nitrogen dioxide D nitrogen dioxide and sulphur dioxide
10、What is formed when calcium carbonate is heated?
A calcium and carbon
B calcium and carbon dioxide
C calcium oxide and carbon
D calcium oxide and carbon dioxide