Chemistry- Metals Flashcards
Development of use of metals in society
Gold, silver,copper used first due to unreactivity and ease of extraction.
Bronze age- alloy of cu, sn,
Iron age- more reactive metal, requires high temperatures to extract
Properties of Metal
Ductile Lustre Electrical Conductivity Malleability Conduct Heat High melting point
Active vs inactive metals
Active- potassium, magnesium, sodium etc
In the middle- lead, iron, tin
Not active- copper, gold, silver, mercury
Activity of metal vs use
The more active a metal, the more energy required to extract it, used later in history
Experiments determine reactivity
Displacement reaction- more active metal displaces less active metal from solution
Zinc, copper, iron
See notes for reactions
Ionic Bond
Transfer of electrons, stable outer shell. Metal and non metal
Covalent Bond
Sharing of electrons for full outer shell, two non metals
Method to extract mercury from ore
Heat Mercury Sulfide to decompose
HgS+’O2-> Hg +SO2
Extract Copper from Ore
Put copper ore (copper carbonate) in sulphuric acid, then use electrolysis to obtain pure copper.
Factors affecting rusting
Oxygen, salt, water
Prevent rusting
Galvanisation
Sacrificial Anode
Impact of corrosion
Significant costs- prevention, repairs, damage to structures
Metal + oxygen =
Metal oxide
Acid plus metal
Salt plus hydrogen
Metal A plus metal B sulfate =
Metal b plus metal a sulfate
