Metals and non-metals
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where on the periodic table are metals located?
on the left of the steps of stairs going from boron to astatine
properties of metals (6)
lustrous (gold) ductile (can be stretched and made into wire) malleable (can be beaten into a shape eg steel of crashed car fixed) conductors of heat and electricity (pots, cicuits) strong (bridges)
define metal
an element that tends to lose electrons and form positive ions eg copper
properties of non metals (3)
• gases • not conductors of heat or electricity • brittle
define non-metal
an element that tends to gain electrons and form negative ions eg sulfur
how to test for metal
see if it conducts electricity in a circuit (crocodile clips)
define alloy
mixture of metals eg bronze : copper+tin , steel=iron+carbon
what’s rusting
a chemical reaction in which iron is changed into a new substance (rust)
investigate conditions needed for rusting
3 test tubes with nails in each calcium chloride to remove water from air air and water both needed
3 ways to prevent rust
painting, oiling, galvanising(coating with zinc) : all form a layer and prevent air and water coming in contact