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What exactly do you find to be the problem?
There is content here http://www.s-cool.co.uk/gcse/chemistry/chemical-bonding/revise-it/covale...
You can also get a free tutorial on all this and more chemistry here - http://www.s-cool.co.uk/content/mytutor-claim-a-free-online-tutorial
There is no commitment - so why not give it a try?
e.g. the melting point of hydrogen sulphide Is -85 degrees and its boiling point is -61 degrees.
Anything below its melting point is a solid.
Anything above its melting point and below its boiling point is a liquid
Anything above it boiling point is a gas
25 degrees is above the boiling point (which is -61 degrees)
So this must be a.........
An alkali is a compound with particular chemical properties including turning litmus blue and neutralizing acids
An alkali has a pH of more than 7
Here you arehttp://www.s-cool.co.uk/gcse/chemistry/chemical-bonding
Try this - http://www.s-cool.co.uk/node/2626
Calcium oxide, CaO, is a base compound which can react with acids such as nitric acid, HNO3.
this question is about reactions of calcium compounds.