GCSE Chemistry C2
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metal atoms are arranged in a :
giant lattice structure
metal atoms are held together :
in a regular pattern by metallic bonding
metallic bonds invole the all important ..... ... which produce all the properties of metals . these .... free electrone come from the ..... ... of every metal atom in the structure . these electrons are ... to ... through the whole structure and so metals are good conductros of .... . these electrons also ... the atoms together in a .... structure . there are strong forces of ........ .... between the ..... metal ... and the .... ... . this means metals have .... metling points and boiling points . these ...... .... also allow the .... of ... to .... over each other , allowing metals to be .... and .......
- free electrons
- outer shell
- electrostatic attraction
- negative electrons
- free electrons
alloys are .... than pure metals
pure metals often aren't quite right for certain jobs . so scientists :
mix two or more metals together creating an alloy with the properties they want
different elements have ..... .... ... . so when another metal is mixed with a pure metal , the new metal atoms will .... the layers of metal atoms , making it .... .... for the layers to slide over each other . so alloys are .... than pure metals
- different sized atoms
- more difficult
a shape memory is :
an alloy that reverts to its origional shape when it is heated after being deformed
an example of a shape memory alloy is
what is nitinol made of
half titanium and half nickel
what is nitinol used for
one common use for nitinol is for wires in dental braces . in the warmth of the mouth , the wires try to return to thier origional size and shape . This pulls or pushes the teeth into position .
what is an advantage for using nitinol for braces
unlike stainless steel , nitinol braces do not have to be frequently replaced or tightened . the teeth are corrected faster and the braces are more comfortable
another use for nitinol is to repair collapsed :
arteries . a squashed tube made of nitinol mesh , called a stent is slid into the artery . as it warms up in the body it expands to its orginional size and opens the artery up
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