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Year 10 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.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) Water poured onto acid makes a poisonous gas
    • b) Mixing gives out a lot of heat, and water poured onto acid can splash the mixture out
    • c) The acid would stop working if water were poured onto it
    • d) The acid would freeze the water

  2. 2.Bleaching powder is made from chlorine and one other substance. Which?

    • a) Plaster of Paris
    • b) Dry slaked lime
    • c) Common salt
    • d) Washing soda

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

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

  4. 4.Solution P has a pH of 6 and solution Q has a pH of 8. Which statement is right?

    • a) They hold the same number of hydrogen ions
    • b) Q has more hydrogen ions, and Q is the acidic one
    • c) P has more hydrogen ions, and Q is the acidic one
    • d) P has more hydrogen ions, and P is the acidic one

  5. 5.Zinc granules are dropped into dilute sulphuric acid and bubbles rise from them. A burning candle held to a bubble makes it pop. Which gas is it?

    • a) Chlorine
    • b) Hydrogen
    • c) Carbon dioxide
    • d) Oxygen

  6. 6.Sodium hydroxide is a base, and it dissolves in water. What is the one-word name for a base that dissolves in water?

  7. 7.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

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

    Mark the line with an X.

    01234567891011121314

Answer key — Year 10 Science — Acids, bases and salts

  1. 1. b) Mixing gives out a lot of heat, and water poured onto acid can splash the mixture out
  2. 2. b) Dry slaked lime
  3. 3. d) Carbon dioxide
  4. 4. d) P has more hydrogen ions, and P is the acidic one
  5. 5. b) Hydrogen
  6. 6. alkali
  7. 7. 3 — Above 7 — basic
  8. 8. 7