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metals and non metal
Chapter 26
Question | Answer |
---|---|
lustrous means | shiny |
ductile means | the metal can be pulled into a wire |
malleable means | the metal can be hammered into a sheet |
conductors | allow heat and electricity to go through them |
Insulators | do not allow heat and electricity to go through them |
a metal is | an element that tends to form positive ions |
a non metal | is an element that tends to form negative ions |
carbon is a non metal | but it does conduct electricity. this is an exception |
carbon is pencils is also called | graphite |
alloys are mixtures of | metals |
brass is a mixture of | copper and zinc |
bronze is a mixture of | copper and tin |
steel is a mixture of | iron and carbon |
solder is a mixture of | lead and tin |
rusting is a chemical reaction where iron is changed into | rust |
conditions necessary for rusting are | water and oxygen |
calcium chloride removes | water |
to prevent rusting use | paint, oil, grease or galvanise |
iron coated with zinc is called | galvanise |
rusting is also called | corrosion |