Do now! Can you complete the sheet “Different Properties” you started yesterday?
Today’s lesson Know how good metals and non-metals are at conducting heat and electricity Know which metals are magnetic Know some of the other properties of metals and non-metals Know that different metals have different uses because of their properties
Properties of Metals?
Properties of Metals ALL metals are good conductors of heat and electricity Electrons can easily move from atom to atom in the metal carrying energy
Properties of Metals Non metals tend to be poor conductors of heat and electricity. Their electrons are bound tightly. with the exception of graphite (carbon)
Properties of Metals Some metals are magnetic Only iron (steel), cobalt and nickel
Properties of Metals Metals generally have high melting points With the exception of mercury and the alkali metals (Lithium, sodium, potassium….) Tungsten melts at 3422 ºC
Properties of metals Most metals are also malleable and ductile
Properties of metals Can you stick in a complete the sheet “Different properties”
Uses Their properties dictate their uses
Gold Unreactive, malleable and a good conductor of electricity Jewelry, wires in computers, gold leaf
Aluminium Light, and a very unreactive oxide layer forms over the reactive metal means it does not corrode Aircraft, cars, cutlery etc.
Steel (mainly iron) Strong, fairly cheap. Building
Copper Ductile, unreactive and a good conductor Saucepans, wires etc.
Let’s go for a walk! Looking for uses of metals
Homework Metal Can/packet/sachet/jar/box/CD case Choose a metal Put the following information about the metal on a can/packet/sachet/jar/box - Name and chemical symbol (2 marks) - Where can it be found? (1 mark) - What does it look like? (2 marks) - Boiling point, melting point, density (3 marks) - The cost per kilogram of the metal (1 mark) - At least three uses of the metal (3 marks) - Any other interesting facts/properties you can find (3 marks) - Make the can look real/attractive (5 marks) Due Friday 11th September 2009