1) Subsidence is a) a way of mining salt b) a way of producing hydrogen c) when land collapses as a result of mining 2) What is most commonly used to study the inner structure of the Earth? a) Deepsea submarines b) Seismic waves c) Drilling stations d) Volcanic probes 3) In the electrolysis of brine, what's made at the cathode? a) Water b) Hydrogen c) Chlorine d) Sodium Hydroxide 4) Steel is stronger and harder than iron a) True b) False 5) Which of these forms iron-rich basalt? a) Runny lava b) Thick lava 6) Brass is an alloy of copper and tin a) True b) False 7) What is produced during a reaction of an acid and a metal carbonate a) Water and an alkali b) Salt, water and carbon dioxide c) acid and an alkali 8) What is produced during the reaction of an acid and a metal hydroxide a) water and an alkali b) salt and an alkali c) salt and oxygen d) salt and water 9) Which of these is not one of the metals in solder a) Lead b) Mercury c) Tin 10) What fertiliser will be produced by reacting ammonia and nitric acid? a) Ammonium phosphate b) Ammonium nitrate c) Ammonium sulphate 11) Any un-reacted nitrogen and hydrogen in the Haber process go to waste a) True b) False 12) Why is reinforced concrete known as a composite material? a) It is made of a combination of materials b) It remains strong under pressure 13) Which of these describes the mantle just beneath the crust a) Cold and rigid b) Cold and non-rigid c) Hot and non-rigid d) Hot and rigid 14) Which type of magma causes an explosive volcanic eruption? a) Iron-rich basalt b) Silica-rich basalt 15) To be absorbed by plants, fertilisers must..... a) have a pH of at least 9 b) be dissolved in water c) have a ph of more than 4 d) be neutral 16) What happens in a neutralisation reaction a) Hydrogen ions and hydroxide ions form an alkali b) water splits into hydrogen and hydroxide ions c) Hydrogen and hydroxide ions react to become water 17) What happens to the ions that don't forma gas at the electrodes in the electrolysis of brine a) They react with hydrogen at the anode b) They form sodium hydroxide c) They combine with the chlorine gas at the cathode

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