1) List the chemical names of 3 acids. a) vomit, vinegar and lemon juice b) vinegar, lemon juice and citric acid c) citric acid, ethanoic acid and hydrochloric acid 2) Which contains more water? a) dilute acids b) concentrated acids 3) A concentrated solution of an acid has a) more acid particles per litre of water than a dilute solution. b) Has less particles of acid per litre of water than a dilute solution. 4) Which is more concentrated? a) 5g of HCl in 10ml water b) 10g of HCl in 30ml of water 5) Which pH is neutral? a) 7 b) 6 c) 5 6) What colour does red litmus paper go in an alkaline solution? a) green b) blue c) red 7) What colour does red cabbage go in an acid? a) green b) pink/red c) purple 8) What is an indicator? a) A substance containing a dye that turns a different colour in alkaline and acidic conditions. b) A chemical used for measuring temperature. c) A chemical used for recording the mass of something. 9) A neutralisation reaction a) is where a base reacts with another base. b) is where an acid reacts with another acid. c) an acid reacts with a substance that cancels it out. 10) Two examples of the use of a neutrallisation reaction is a) where farmers put bases like limestone on soil b) where farmers put neutral compounds on soil c) where farmers put alkalis on acid lakes  11) An alkali is a) an insoluble base. b) a soluble acid. c) a soluble base. 12) A salt is a) an element that forms when a metal reacts with an acid. b) a compund that forms when an acid reacts with a metal c) a compound that forms when an acid reacts with sulphur. 13) magnesium + hydrochloric acid forms a) magnesium and chlorine b) magnesium chloride + hydrogen c) magnesium sulfate + hydrogen 14) copper oxide + nitric acid forms a) copper sulfate + water b) copper nitrate + water c) copper chloride + water 15) When making salt crystals, heating the solution in an evaporating basin, instead of directly in a beaker a) forms bigger crystals b) forms smaller crystals

Acids and alkalis revision

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