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CHEM AND BIO HELP AND TIPS HERE

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Ghost Of Highbury:

--- Quote from: soraam on June 05, 2010, 11:27:08 am ---how do you figure out the limiting reactant if the mole ratio is NOT 1:1           :-[

--- End quote ---

Example : Mg + 2HCl --> MgCl2 + H2

If 0.1 mol of Mg reacts with 0.1 mol of HCl, the limiting reactant is HCl acid because, i we look at the equation, for every mole of Mg used we need 2 moles of HCl.

So there will still be 0.1/2 0.05 mol of Mg left when the HCl is used up.

Liya:
can someone help me?
in june'08 chemistry p3 number 1.e
"name an element that has oxidation states of 2 and 3 only"
so, how do you find the answer for all questions like this one?

Meticulous:
iron

nid404:
Metal that have varying oxidation numbers are transition metal.
Fe-->2+/3+
Cu-->+/2+

etc...

jellybeans:
Questionnnn , why do some elements react with water to form oxides but some hydroxides?  ???

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