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Chemistry C3
Topic 4: Chemicals working for us…read more

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Transition metals characteristics
· High melting point
· Good conductors of heat and electricity
· High density
· They form colourful compouds.
· Good examples of these are iron and
copper.…read more

Slide 3

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Compound colours of transition metals
in comparison to Group 1+2 metals
Transition metals Group 1+2 metals
Iron oxide rusty brown Potassium nitrate white
Copper sulphate blue/green Sodium chloride white
Silver nitrate silver Magnesium chloride white
Gold nitrate gold Calcium carbonate white
Nickel chloride green Lithium fluoride white
Nickel sulphate blue/green Magnesium oxide white
Copper carbonate green Potassium iodide white
Iron nitrate faun brown
Cobalt chloride burgandy
Manganese oxide grey/blue
Chromium chloride racing green
Summary: Transition metals have coloured compounds whereas Group 1+2
metals have white compounds.…read more

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Information about transitional metal
compounds and pigments
· Transition metals often form colourful compounds.
· Pigments are insoluble compounds.
· Dyes are soluble compounds that form chemical bonds with fabrics.
· Suspensions are powdered pigments mixed with a liquid.
· Emulsion paints are pigments dispersed in water.
· Solvents evaporate when paint dries.
· Gloss paints are made from pigments being dispersed in an oil based liquid.
· Oxidation is the reaction that occurs when paint dries.
· Mordants are chemicals required to form bonds with the fabric.
· Sustainable natural organic dyes are formed from plants and insects.
· Carcinogens are cancer causing chemicals that are used to make dyes.
· Artificial dyes are made from coal and oil.
· Straw, sugar and wood are renewable biomass that could be used to make
dyes.…read more

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Transition metals as catalysts
· Catalysts are used to speed up a reaction
and they are vital in industry to make a
good yield quickly.
· Transition metals are used a lot for this
purpose. Iron is used as a catalyst in the
Haber process (production of ammonia).
Platinum is used in catalytic converters in
cars, which `convert' toxic exhaust gases
into non harmful gases like carbon dioxide.…read more

Slide 6

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Alkali Metals: Physical Properties
· Soft, can be cut with a knife
· Relatively low melting points
· Silver in colour
· Low density…read more

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