Sunday, 3 June 2018 Metal Properties

Periodic Table Metals are on the left side. Non-metals are on the right side. Draw the line on your periodic table and label the two sides. Use the periodic table on the classroom wall to get it in the right place.

Properties of metals Physical properties – are the way a metal looks or behaves in different physical situations. Chemical properties – are the way a metal reacts with other compounds.

Physical properties Experiment to see the physical properties of metals.

Physical properties Copy Malleable – beaten into a shape. Good conductors of electricity. Good conductors of heat. Physical properties Most metals are hard. Shiny when cleaned or scratched. Ductile – can be drawn through a hole to make a wire.

Chemical properties Copy React with acids. React with water. Reactivity Series – Reactiveness is in an order. React with oxygen.

Match the technical word with the everyday word

Answers Ductile= Stretchy Malleable= Bendy Lustre= Shiny Corrode= Rust Alloy= Blend Conductivity= Letting electricity flow Reactivity= How much happens when mixed

Physical Properties Worksheet Work through the sheet with the table

Uses of metals Often you are asked NCEA questions about the uses of metals and you have to relate the use to one or more properties.

Uses of metals Copy Iron (Fe) Iron is strong and relatively cheap. It is good for railway lines, car bodies, bolts, nails and bridges. It is not good for building materials because it rusts so easily. (Rust is the reaction of the iron with oxygen.)

Copy Zinc (Zn) Zinc is good to galvanise iron with. (Galvanising is when the iron is completely coated in the thin layer of zinc.) It prevents the oxygen and water from coming into contact with the iron, so the iron lasts longer. Galvanised iron is used for roofs, fences, posts, rubbish bins, many nails and bolts.

Copy Aluminium (Al) Aluminium is cheap, strong, light, looks good and does not corrode in oxygen (air) or react with water. It is good for aeroplanes, racing bikes, cooking utensils, drink cans, door and window frames and TV aerials. Aluminium is not as good at conducting electricity as Cu (copper) but it is cheaper and lighter.

Copy Copper (Cu) Excellent at conducting heat and electricity, very malleable and ductile and resistant to corrosion. Copper is good for electrical wiring, hot water pipes and saucepan bottoms. Copper is expensive to extract from the ground.

Copy Gold (Au) Gold is very malleable and ductile, resistant to corrosion and very attractive. It is used in jewellery, dentistry, medicine and coating electrical contacts. Gold is rare and so very expensive.

“Uses of Metals” worksheet – using the physical and chemical properties to answer questions. Do Q 1, 2, 4, 6, 7, 8