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Year 11 Science — Acids, bases and salts

Predict what an acid gives with a metal, a carbonate and a base, read a solution's nature off the pH scale, and name the salts that common salt is turned into.

Name: ________________________

  1. 1.Match each natural source to the acid the chapter names in it.

    • Vinegar
    • Lemon
    • Tamarind
    • Tomato
    • Curd
    • An ant sting
    • Oxalic acid
    • Acetic acid
    • Methanoic acid
    • Citric acid
    • Tartaric acid
    • Lactic acid

  2. 2.The pH scale is drawn out below. Where does a neutral solution sit?

    Mark the line with an X.

    01234567891011121314

  3. 3.Blue copper sulphate crystals are heated until they turn white, and droplets of water collect in the tube. How many water molecules does one formula unit of the hydrated salt hold? Answer with a number.

  4. 4.A gas is bubbled through lime water and the lime water turns milky. Which gas is it?

    • a) Hydrogen
    • b) Carbon dioxide
    • c) Oxygen
    • d) Water vapour

  5. 5.Sort each of these by whether the chapter treats it as acidic or as basic.

    Groups: Acidic · Basic

    • Gastric juice in the stomach
    • The sting left by a bee
    • Toothpaste
    • The stinging hair of a nettle leaf
    • Milk of magnesia
    • A solution of baking soda

  6. 6.Concentrated sulphuric acid has to be mixed with water. Why is the acid poured into the water rather than the water into the acid?

    • a) The acid would stop working if water were poured onto it
    • b) Water poured onto acid makes a poisonous gas
    • c) The acid would freeze the water
    • d) Mixing gives out a lot of heat, and water poured onto acid can splash the mixture out

  7. 7.Common salt is turned into bleaching powder in stages. Put them in order, beginning with "Brine, common salt dissolved in water".

    • Chlorine given off at the anode
    • Chlorine acting on dry slaked lime
    • Brine, common salt dissolved in water
    • An electric current passed through the brine
    • Bleaching powder

  8. 8.A strip of pH paper scale is drawn below, running from 0 at the left to 14 at the right. Tap the stretch a basic solution would read in.

    Write the number of the part.

    123

Answer key — Year 11 Science — Acids, bases and salts

  1. 1. Vinegar → Acetic acid; Lemon → Citric acid; Tamarind → Tartaric acid; Tomato → Oxalic acid; Curd → Lactic acid; An ant sting → Methanoic acid
  2. 2. 7
  3. 3. 5
  4. 4. b) Carbon dioxide
  5. 5. Gastric juice in the stomach → Acidic; The sting left by a bee → Acidic; The stinging hair of a nettle leaf → Acidic; Milk of magnesia → Basic; Toothpaste → Basic; A solution of baking soda → Basic
  6. 6. d) Mixing gives out a lot of heat, and water poured onto acid can splash the mixture out
  7. 7. 1. Brine, common salt dissolved in water 2. An electric current passed through the brine 3. Chlorine given off at the anode 4. Chlorine acting on dry slaked lime 5. Bleaching powder
  8. 8. 3 — Above 7 — basic