1) Acids: a) can be made safe by heating them b) are always dangerous. c) are more dangerous when diluted than when concentrated. d) are more dangerous when concentrated 2) What does this sign mean? a) explosive b) harmful c) poisonous d) flammable 3) Alkalis: a) are much safer than acids. b) are not allowed to be transported by road c) are always more dangerous than acids d) can be more dangerous than acids 4) The hazard warning signs on chemical tankers: a) help the emergency services deal with a spillage if there is an accident. b) tell other drivers the distance to stay back from the lorry. c) allow the police to check the speed of the tanker. d) tell the driver of the lorry what the 5) Acids taste: a) salty. b) sharp. c) sweet. d) bitter. 6) The name of an acid in lemon juice is: a) citric acid. b) lemonic acid. c) acetic acid. d) sulphuric acid. 7) Which of these acids is safe enough to preserve foods? a) dilute hydrochloric acid b) dilute sulphuric acid c) concentrated ethanoic acid d) dilute ethanoic acid 8) Onions can be pickled by storing them in vinegar. This is done because: a) it makes them go a better colour b) it kills bacteria and stops the onions going off c) it neutralises the alkalis that make onions go bad. d) it helps to digest the onion leaves. 9) Which one of these is an acid? a) vinegar b) soap c) salt water d) tap water 10) Which one of these is an alkali? a) lemon juice b) pure water c) toothpaste d) vinegar 11) Litmus can be used as an indicator because it: a) is an acid. b) is an alkali. c) comes from a plant. d) changes colour 12) Which of these is not neutral? a) sugary water b) salty water c) soapy water d) pure water 13) The pH number of a weak alkali is: a) 7 b) 9 c) 1 d) 5.5 14) What colour will universal indicator turn when mixed with a strong alkali? a) green b) purple c) red d) orange 15) Water that was highly polluted with acid could have a pH number of: a) 9 b) 5.5 c) 2 d) 7 16) Acids all contain a) alkali. b) sulphur. c) hydrogen. d) oxygen. 17) The word which best describes what happens when an acid reacts with an alkali is: a) neutralisation. b) evaporation. c) acidification. d) alkification. 18) A wasp sting has a pH of about 10. You could treat it best using: a) a weak alkali. b) a weak acid. c) a strong acid. d) a strong alkali. 19) If you mixed a solution of pH 4 with one of pH 8, the final pH could be: a) 4 b) 2 c) 12 d) 6 20) If you took a solution of pH 5 and diluted it with water, the pH number would: a) go up by three or four. b) go down by one or two. c) stay the same. d) go up by one or two.

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