Ionic Compounds and Insoluble Salts

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1. What colours do potassium and sodium metals create during a flame test?

  • potassium = green and sodium = purple
  • potassium = purple and sodium = yellow/orange
  • potassium = blue and sodium = red
  • potassium = yellow and sodium = blue
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2. Name all of the soluble substances (excluding exceptions)

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

3. Why is barium used in x-rays?

  • Barium sulfate is opaque to x-rays so it can be used to show problems in the gut. It is toxic but can be safely drunk because it's insoluble.
  • It is transparent so allows the bones to be more visible, and it is soluble, meaning that it absorbs into your blood and leaves no toxic waste behind,
  • It contains reactive ions that react with the x-rays, causing the reaction zones to show up in your body over areas of abnormality
  • Because it is insoluble so clumps in areas of broken bones.

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

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

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

  • calcium = orange and copper = pruple
  • calcium = blue/green and copper = red
  • calcium = red and copper = blue/green
  • calcium = purple and copper = red

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