Chemistry Kenya
Water and Hydrogen
Water and Hydrogen
Water and Hydrogen
Sources of water: Burning of organic matter e.g. burning candle in air (test for carbon(IV) oxide and water vapour using calcium hydroxide and cobalt chloride paper or anhydrous copper (II) sulphate respectively)
Water has an oxide of hydrogen
Reaction of sodium, calcium, magnesium with cold water and reaction of magnesium, zinc, iron with steam.
Laboratory preparation of hydrogen by reacting a metal with a dilute acid. (relate methods of collection to properties of the gas). Test for hydrogen
Properties of hydrogen: physical and chemical
Oxidation and reduction (oxygen gain and removal only) e.g. in metal oxide-hydrogen reaction. (Caution: experiments involving the burning of hydrogen gas are explosive).
Hydrogen uses (manufacture of margarine, rocket fuels, ammonia, hydrochloric acid, Oxy-hydrogen flame for welding and weather balloons.
Listening to this topic
