EXERCISES IN OBSERVATION, RECORDING OBSERVATIONS AND WRITING FORMULAE AND EQUATIONS.

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GCSE Science

EXERCISES IN OBSERVATION, RECORDING OBSERVATIONS AND WRITING FORMULAE AND EQUATIONS.

1) REACTION BETWEEN A CARBONATE AND AN ACID

  1. Measure about 1cm of sodium carbonate in a test tube and add the same amount of dilute hydrochloric acid.
  2.  Using a clean pipette, withdraw a sample of gas and bubble it through some lime – water in a clean test tube. If there is a white precipitate then the gas produced was carbon dioxide.
  3. Dispose of the contents down the sink using plenty of water.

2) REACTION BETWEEN A METAL AND A DILUTE ACID

  1. Take a few pieces of magnesium ribbon, place in a test tube and add approximately 2cm of dilute hydrochloric acid.
  2. Hold your thumb over the top of the test tube until you can feel the pressure of the gas pushing against your thumb. Remove you’re thumb and hold a lighted splint to the mouth of the test tube. A small explosion confirms that the gas produced is Hydrogen.
  3. When there is no solid left dispose of solution in a sink with plenty of running water.

3) REACTION BETWEEN A CHLORIDE AND CONCENTRATED SULPHURIC ACID.

  1. Measure a small amount of sodium chloride in a test tube add a few drops of concentrated sulphuric acid. Do this in the fume cupboard and make sure you are wearing gloves.
  2. Note the effervescence (bubbling) as hydrogen is produced. Blow across the mouth of the test tube and note the misty fumes.
  3. Test the gas with moist universal indicator paper. Then dip a dry, clean glass rod into concentrated ammonia solution in the fume cupboard and hold the rod over the mouth of the test tube. Note the white smoke.
  4. Put the test tubes in a rack and leave in the fume cupboard.
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4) REACTION BETWEEN AN AMMONIUM SALT AND SODIUM HYDROXIDE SOLUTION

  1. Measure a small amount of ammonium chloride in a test tube and add approximately the same amount of dilute sodium hydroxide solution. Then warm the tube gently over a Bunsen burner (blue flame).
  2. Test the gas with moist universal indicator paper. Next smell the gas with caution. An alkaline gas with this smell is Ammonia.
  3. Dispose of the contents down the sink with plenty of running water.

5) REACTION BETWEEN MANGANESE (IV) AND CONCENTRATED HYDROCHLORIC ACID.

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EXERCISES IN OBSERVATION, RECORDING OBSERVATIONS AND WRITING FORMULAE AND EQUATIONS.
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  • Level
    GCSE
  • Subject
    Science
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