Oxygen and Oxides (2D)

Experiment too show that Air contains 21% Oxygen

Get two 100ml lab syringes. Set one at 100ml, the other at zero. Connect them both to a glass tube filled with copper, held in place with a little glass wool at each end. Heat the copper gently while drawing the air from one syringe to another. Continue until there are no further changes. Allow to cool a little. Draw gas into one syringe, read volume. eg final vol =79cm3, so percent O2 = 100-79 =21%

Too a mixture of Hydrogen Peroxide and the Catalyst Manganese Oxide add drops off Hydrogen Peroxide.  The Oxygen gas is given off and collected in the gas Jar this can be tested using a glowing splint.

Preparation of Carbon Dioxide

Add Hydrochloric acid too Calcium Carbonate chips and bubble through Lime water.  Observations - Lime water goes Milky-Carbon Dioxide slightly soluble and forms a weak Acid, Can be used in Fizzy Drinks-Carbon Dioxide is denser than air and puts out flames, Can be used in Fire Extinguishers 

Carbon Dioxide and Global WarmingIt absorbs heat energy that is radiated from the Earth’s surface and prevents it from escaping into space. This keeps the Earth warmer than it would otherwise be. But human activities are increasing the amount of carbon dioxide in the atmosphere. This increases the greenhouse effectand leads to global warming.

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