Testing for Gases

How do you know which gas is which? You test them!

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How to test for... Oxygen

  • Light a splint
  • Put the splint out
  • Put it over the gas
  • If it is oxygen the splint will relight.
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How to test for... Oxygen

  • Light a splint
  • Put the splint out
  • Put it over the gas
  • If it is oxygen the splint will relight.
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How to test for... Hydrogen

  • Get a lit splint.
  • Put it over the gas.
  • If the gas is hydrogen a squeaky pop noise would have been made.
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How to test for... Hydrogen

  • Get a lit splint.
  • Put it over the gas.
  • If the gas is hydrogen a squeaky pop noise would have been made.
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How to test for... Carbon Dioxide

  • Get a lit splint. 
  • Put it over the gas.
  • If the gas was Carbon Dioxide the splint would have been put out.
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How to test for... Carbon Dioxide

  • Get a lit splint. 
  • Put it over the gas.
  • If the gas was Carbon Dioxide the splint would have been put out.
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How to test for... Carbon Dioxide (Test 2)

  • Get a glass of lime-water
  • Get a straw and put it in the glass.
  • Exhale through the straw. You will have to blow for a long time because exhaled breathe suprisingly only contains 3-4% CO2
  • If there is Carbon Dioxide (Which there will be) the lime water will turn a milky colour.



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How to test for... Carbon Dioxide (Test 2)

  • Get a glass of lime-water
  • Get a straw and put it in the glass.
  • Exhale through the straw. You will have to blow for a long time because exhaled breathe suprisingly only contains 3-4% CO2
  • If there is Carbon Dioxide (Which there will be) the lime water will turn a milky colour.



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How to test for Carbon Dioxide (Test 3)

  • Collect some Carbon Dioxide in a test tube.
  • Carefully pour a little bit of limewater into the test tube.
  • The limewater will turn a milky colour
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How to test for Carbon Dioxide (Test 3)

  • Collect some Carbon Dioxide in a test tube.
  • Carefully pour a little bit of limewater into the test tube.
  • The limewater will turn a milky colour
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How to test for... Carbon Dioxide (Test 4)

  • Put a few spoonfuls of clear limewater in a beaker and leave to sit for a few days.
  • If there is CO2 present in the air, the lime water will turn into a milky colour.
  • On the edges you will see some limestone forming because of the CO2 reacting with it.
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How to test for... Carbon Dioxide (Test 4)

  • Put a few spoonfuls of clear limewater in a beaker and leave to sit for a few days.
  • If there is CO2 present in the air, the lime water will turn into a milky colour.
  • On the edges you will see some limestone forming because of the CO2 reacting with it.
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