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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 |