Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
astarmathsandphysics:
boron is a Group 13 element that has properties which are borderline between metals and non-metals (semimetallic). It is a semiconductor rather than a metallic conductor. Chemically it is closer to silicon than to aluminium, gallium, indium, and thallium.
nid404:
Sorry. I've been away for a while
The diff colors r for the diff metals in the alloy. The positive metals ions are in the sea of electrons...similar to metallic bonding but there metals here do not bond chemically...Alloys r mixtures, not compounds
And boron is a metalloid. It exhibits a +3 charge generally. When bonding covalently it has a 5- charge(e.g. BF3)
Saladin:
yes nid is right,
wat the examiners want to see is that you have different sizes of atoms, to show there there is more than one element.
But for silicon carbide, it is as I have said.
These answers are for IGCSE and not for A level for higher. So only for IGCSE.
Hope that helps.
nid404:
yup this is IG stuff
holtadit:
Yeah... this IG stuff. Got my exmainations in a few weeks time. The clock is ticking *tick* *tock* .... :D ;D
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