Section+2+d

back to IGCSE chemistry = oxygen and oxides = 2.16 recall the gases present in air and their approximate percentage by volume 2.17 describe how experiments involving the reactions of elements such as copper, iron and phosphorus with air can be used to determine the percentage by volume of oxygen in air 2.18 describe the laboratory preparation of oxygen from hydrogen peroxide 2.19 describe the reactions with oxygen in air of magnesium, carbon and sulphur, and the acid- base character of the oxides produced 2.20 describe the laboratory preparation of carbon dioxide from calcium carbonate and dilute hydrochloric acid 2.21 describe the formation of carbon dioxide from the thermal decomposition of metal carbonates such as copper(II) carbonate 2.22 recall the properties of carbon dioxide, limited to its solubility and density 2.23 explain the use of carbon dioxide in carbonating drinks and in fire extinguishers, in terms of its solubility and density 2.24 understand that carbon dioxide is a greenhouse gas and may contribute to climate change
 * You will be assessed on your ability to**

**Section notes**

**Textbook** = Investigations =
 * Edexcel IGCSE Chemistry pages 54 - 59

Also a simple investigation uses candles as shown below. A candle floating on water is placed underneath a graduated beaker after it has been lit. When the candle extinguishes the water rises to about 1/5th of the height of the measuring cylinder. [|candle burning underneath beaker experiment] [|youtube clip of candle burning] = Resources =

Animations
Animation showing how to investigate the proportion of oxygen in atmosphere using gas syringes [|copper and oxygen reaction] [|Acid rain] [|preparation of oxygen by decomposing hydrogen peroxide]

Video clips
[|preparation of oxygen] [|Youtube clip on global warming] [|carbon dioxide production]