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Questions 5.4a

  1. There are many metals which react with acids to produce hydrogen gas. Suggest a reason why zinc is a suitable choice for laboratory preparation of hydrogen (Hint: reactivity). ----------------------------------------------
  2. Hydrogen can be collected over water (by passing it through water) with almost no losses. What does this tell us about the solubility of hydrogen in water? -------
  3. What is the effect, if any, of hydrogen on wet litmus paper? (Search Internet). --
  4. What is the appearance (colour) of hydrogen gas? ---------------------------------
  5. How can hydrogen gas be identified? ----------------------------------------------------


Answers to Questions 5.4a

  1. Zinc reacts with dilute acids at a moderate speed. The other metals either react violently or too slowly.
  2. Hydrogen is insoluble in water.
  3. Hydrogen has no effect on litmus paper. It is neutral.
  4. Hydrogen is a colourless gas.
  5. Hydrogen is identified with a burning splint. It extinguishes a burning splint with a pop sound.