does any one no the best way to understand this and possible give me an example.
im realy getting upset to why i cant understand this.
I get this
heating magnesium and sulphur powders together produces solid magnesium sulphide.
Mg(s) + S(s) = MgS(s
but not this
calcium carbonate breaks down on heating to give calcium oxide and carbon dioxide.
CaCO3(s) = CaO(s) + CO2(g)
how do u got three oxygens in calcium carbonate, how is it worked out
any help is much appreciated as this is really stressing me out now.
How do u work them out? Is there a simple way?
radical symbols such as
Do they have to be memorised or is there a way to work them out.
Are there any other radical symbols.
plz can anyone help me understand this
How Do I Work The Ion Charges Out Or Do They Have To Be Memorised
im talking about gcse level
at gcse you dont have to understand it just learn it. Its not that hard, theres not that many equations you need to learn at gcse anyway
I suggest learning the Periodic Table and about valencency. It's interesting stuff, and you don't have to just memorise parrot fashion as was intimated above.
It was bad teaching that led me to drop Chemistry at 14 years old. I'd try not to avoid understanding and on the contrary someone at gcse should be fascinated by the subject and wanting to understand it. But yeh, it's fascinating that the element can be arranged in groups and periods, but yeh, the reason for that would be beyond your level, but not the stuff about ions.
Well my situation is that its been 2 years since I have done my gcse's because of this I have forgot a few things. I never realy paid attention to
chemcial equations in my GCSE,now that i want to do my A-levels in sciences I am revisng over some material. I want to make sure I know everything up to GCSE level so that when I start I am ready for my AS year
I see, well I see your going off at a tangent,
The metal Magnesium, groups 2, valency therefore 2, so the hydroxide anions will be -2. Yes or No?
I know the transition metal Fe has several valencies, was this your point you were cautioning me on?
Hydroxide anion is a valency -1
That you just have to learn, to try and understand it is beyond GCSE level. At GCSE you aren't expected to be able to work out the polyatomic ionic charges, although the monatomic ones are relatively simple to do from the periodic table (basically add or subtract the group from 8 - a bit simplistic but that's roughly it). You have to learn polyatomic ones for GCSE though.
Because in a compound the charge has to be neutral for it to be stable you therefore have Mg(OH)2 (little 2), as this is Mg 2+ + 2OH- which makes a neutral compound.
Similarly in a balanced equation not only do the number of each type of atom have to be equal but the charge has to be equal on both sides; this is important in oxidation and reduction.