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Compare ores, minerals and metals. In your answer, give an example of each showing how they are related. Minerals contain ores ---> ores contain metals?

I'm in preliminary at the moment. And some of my chemistry teachers recommended me to buy it but I'm just not too sure whether to buy it or not.

But is the chemistry one worth $50 and does it have a lot of mistakes?

Hey, Does anybody have one of those "Dot Point" textbooks? Whether it would be for chemistry, physics, biology and etc. (Preferably chemistry since I want a chemistry one) I have a numerous amount of textbooks including: macquaire, conquering and contexts. I'm looking for a textbook with more...

whats the hardest trigonometry questions ever!! i need one so i can watch my teacher suffer in pain by not being able to solve it thanks

Sorry guys the part a is actually a + on the bottom. sin 2x/1+cos2x Sorry.

http://community.boredofstudies.org/attachment.php?attachmentid=20528&stc=1&d=1274255479 I simplified that and got tan x. But the second part is: (b) Hence find the exact value of tan 15. Anyone know how to do this? Also, are there worked solution for the 'maths in focus' books since ive...