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@colour: okie dokie I got this

[quote=zetradedd]Yeah I've got that on my periodic table, it's just the middle section (can't think of name rn) I didn't know how to find out the charges as we haven't been taught in class yet, but it was on the homework[/quote]

you'll never really be taught to remember the ionic charges of transition metals, but when you work with them, all you have to do really is criss cross the subscripts so Cr2O3 criss crossed is Cr +3, O -2

[quote=zetradedd]Yeah I've got that on my periodic table, it's just the middle section (can't think of name rn) I didn't know how to find out the charges as we haven't been taught in class yet, but it was on the homework[/quote]
the charges of transition metals usually vary. but from the ones you have on the pd table you can just calculate the charge of it in a compound, since the compound has 0 net charge and you have the other element's charge already. sometimes the net charge isn't 0 so there will be like a + or - number on the top right

[quote=dorks]because neither problem has charges leftover you can assume overall charge = 0
and transition metals can have multiple charges, like Fe can be +1, +2, +3 and others can be really nutso
S has -2 charge and bc you only have 1 Fe, charge on Fe = +2
O has a -2 charge so total you have -6
because you have 2 Cr, 6/2 = +3 charge on Cr

best way to do it is to write out the charges [url=http://www.westfield.ma.edu/cmasi/gen_chem1/nomenclature/nomenclature%20gifs/periodic_table.gif]like this[/url]. they will for sure always have those charges and so you can divide if there are multiple atoms of the unknown and then subtract them to find the charge of the remaining element[/quote]

Yeah I've got that on my periodic table, it's just the middle section (can't think of name rn) I didn't know how to find out the charges as we haven't been taught in class yet, but it was on the homework

because neither problem has charges leftover you can assume overall charge = 0
and transition metals can have multiple charges, like Fe can be +1, +2, +3 and others can be really nutso
S has -2 charge and bc you only have 1 Fe, charge on Fe = +2
O has a -2 charge so total you have -6
because you have 2 Cr, 6/2 = +3 charge on Cr

best way to do it is to write out the charges [url=http://www.westfield.ma.edu/cmasi/gen_chem1/nomenclature/nomenclature%20gifs/periodic_table.gif]like this[/url]. they will for sure always have those charges and so you can divide if there are multiple atoms of the unknown and then subtract them to find the charge of the remaining element

This may help http://youtu.be/X_LVANMpJ0c

Well Fe and S criss cross applesawzzz 1:1 therefore since S -2, Fe +2