Answers section
Questions 5.4a
- 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). ----------------------------------------------
- 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? -------
- What is the effect, if any, of hydrogen on wet litmus paper? (Search Internet). --
- What is the appearance (colour) of hydrogen gas? ---------------------------------
- How can hydrogen gas be identified? ----------------------------------------------------
Answers to Questions 5.4a
- Zinc reacts with dilute acids at a moderate speed. The other metals either react violently or too slowly.
- Hydrogen is insoluble in water.
- Hydrogen has no effect on litmus paper. It is neutral.
- Hydrogen is a colourless gas.
- Hydrogen is identified with a burning splint. It extinguishes a burning splint with a pop sound.