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Boss quiz

10 questions on the whole topic. You get one try at each.

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  1. A liquid turns litmus red. What is the liquid?

    • Pure water
    • An acid
    • A neutral liquid
    • An alkali

  2. What is the pH of pure water?

    • 0
    • 7
    • 10
    • 14

  3. Which of these is an alkali?

    • Orange juice
    • Lemon juice
    • Soap
    • Vinegar

  4. A liquid turns universal indicator purple. What is it?

    • Neutral
    • A strong alkali
    • A strong acid
    • A weak acid

  5. Which of these is the most acidic?

    • pH 5
    • pH 7
    • pH 1
    • pH 12

  6. What does an acid make when it reacts with an alkali?

    • A stronger acid
    • Only water
    • A salt and water
    • A salt and hydrogen

  7. Hydrochloric acid is neutralised by sodium hydroxide. Which salt forms?

    • Sodium oxide
    • Sodium sulfate
    • Sodium nitrate
    • Sodium chloride

  8. A metal fizzes in acid. Which gas is in the bubbles?

    • Hydrogen
    • Nitrogen
    • Carbon dioxide
    • Oxygen

  9. How do you test for hydrogen?

    • The gas smells of eggs
    • A glowing splint relights
    • Litmus turns blue
    • A lit splint gives a squeaky pop

  10. What does an indigestion tablet do?

    • Adds more acid
    • Cools the stomach
    • Neutralises stomach acid
    • Makes hydrogen gas
Answers
  1. An acid. Litmus turns red in acid and blue in alkali.
  2. 7. Pure water is neutral, and neutral is pH 7.
  3. Soap. Soap is an alkali. The other three are acids.
  4. A strong alkali. Purple is at the top of the pH scale, so it is a strong alkali.
  5. pH 1. The lower the pH, the stronger the acid.
  6. A salt and water. acid + alkali → salt + water.
  7. Sodium chloride. Hydrochloric acid always makes a chloride.
  8. Hydrogen. metal + acid → salt + hydrogen.
  9. A lit splint gives a squeaky pop. Hydrogen burns with a squeaky pop.
  10. Neutralises stomach acid. It contains a base, which neutralises the extra acid.