Ionic Compounds and Insoluble Salts

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

  • calcium = orange and copper = pruple
  • calcium = red and copper = blue/green
  • calcium = purple and copper = red
  • calcium = blue/green and copper = red
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2. What colours do potassium and sodium metals create during a flame test?

  • potassium = yellow and sodium = blue
  • potassium = purple and sodium = yellow/orange
  • potassium = green and sodium = purple
  • potassium = blue and sodium = red

3. What is the test for carbonates?

  • Bubble a gas through lime water and if carbon dioxide is present it will turn milky.
  • Use a lighted splint to create a squeaky pop in a test tube if the hydrogen is present
  • Use a smouldering splint and see if it relights in the test tube if oxygen is present
  • Add hydrochloric acid and barium chloride solution to the carbonate.

4. What is spectroscopy and why is it used?

  • This is the correct term for a flame test and they are used to find out what element/elements a substance contains.
  • 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 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.
  • 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.

5. 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.


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