Ionic Compounds and Insoluble Salts

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1. What colours do calcium and copper metals create during a flame test?

  • calcium = red and copper = blue/green
  • calcium = purple and copper = red
  • calcium = orange and copper = pruple
  • calcium = blue/green and copper = red
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2. What is the test for chlorides?

  • dd chlorine and water and if it begans to smoke and fizz it was a chloride
  • Add dilute nitric acid and silver nitrate solution and if a white precipitate of silver chloride forms, the original was a chloride.
  • Add dilute hydrochloric acid and barium chloride to the solution. If a white precipitate of barium chloride forms, the original was a chloride
  • Add citric acid and lead chloride solution and if it changes colour from clear to red it was a chloride

3. Name all of the insoluble substances (including exceptions)

  • nitrates, sulfates and salts
  • sodium, potassium and ammonium carbonates and hydroxides
  • Silver and lead chlorides, lead, barium and calcium sulfates and carbonates and hydroxides
  • chlorides, sulfates, nitrates and salts of sodium, potassium and ammonium

4. Name the exceptions to being insoluble

  • chlorides, sulfates, nitrates and salts of sodium, potassium and ammonium
  • nitrates, sulfates and salts
  • potassium, sodium and ammonium carbonates and hydroxides
  • lead, barium and calcium sulfates

5. What is spectroscopy and why is it used?

  • It is when a gaenocologists takes a look at the nether regions of a woman's parts and tries to work out what elements may be stuck in there.
  • It is when a sample of an element is placed under an ultra magnifying lense and tiny tiny amounts of the element can be seen. It is very accurate.
  • It is a test where the patterns of light emitted by the elements in a heated sample are analysed. It is fast and reliable and can be used to detect very small amounts of element in a sample.
  • This is the correct term for a flame test and they are used to find out what element/elements a substance contains.

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