sc13 transition metals
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where are the transition metals in the periodic table
in the middle
in general do transition metals have high or low boiling points
high, except mercury which boils at room temperature
do transition metals have high or low densities
high
what is the catalyst in the haber process for making ammonia
iron
what is the catalyst for making sulfuric acid in the contact process
vanadium pentoxide
do transition metals create grey or colourful compounds
COLOURFUL
why are pure metals malleable
because they have a regular arrangement of identical atoms so the layers of ions slide over each other
how are alloys made
by adding another element to a metal
why are alloys stronger
because they are made up of different sized atoms which makes it harder for the layers of ions to slide over each other
how is steel made
by adding small amounts of copper to pure iron
how is bronze made and what are its properties
copper + tin, its harder than copper, used to make medals and statues
how is brass made and what are its properties
Copper + zinc, its more malleable, used in door fittings
what is corrosion of metals caused by
redox reactions
when does rusting happen
when iron is exposed to air and water
what is galvanising
an example of sacrificial protection, where a coat of zinc is put onto an iron object to stop it from rusting, zinc is more reactive than iron so it’ll loose electrons and corrode in preference to iron
what are some ways of protecting ion from rusting
painting, oiling or greasing,
what is sacrificial protection
placing a more reactive metal with the iron, water and iron react with the sacrificial metal instead of the iron
what is electroplating
coating the surface of a metal with another using electrolysis