oddcrap Posted November 21, 2005 Share Posted November 21, 2005 Hey guys, I need some help here with formulas and names. Got a test tomorrow and I don't really understand it maybe someone here can make it a little easier for me :) Ok.. Ionic --> Metals Molecular --> Non-Metals Understand that.. Now Writing the formulas is where im having problems Nickel II Chromate would be N1Cr04 HTF do they get this? And Cesium Carbonate Cs2Co3 Im very confused and I have a test tomorrow. I know how to distinguish from ionic and molecular but I cant tell which need the roman numerals or which I actually have to switch the 2+, 1- how would you determine the charge and roman numeral! Forgive me for my spelling I have 4 stitches in my finger. Link to comment Share on other sites More sharing options...
vincent Posted November 21, 2005 Share Posted November 21, 2005 I believe the naming for these two elements have to do with their atomic makeup. But don't quote me, i don't know much when it comes to chemistry. Link to comment Share on other sites More sharing options...
ice430 Posted November 21, 2005 Share Posted November 21, 2005 Hey guys,I need some help here with formulas and names. Got a test tomorrow and I don't really understand it maybe someone here can make it a little easier for me :) Ok.. Ionic --> Metals Molecular --> Non-Metals Understand that.. Now Writing the formulas is where im having problems Nickel II Chromate would be N1Cr04 HTF do they get this? And Cesium Carbonate Cs2Co3 Im very confused and I have a test tomorrow. I know how to distinguish from ionic and molecular but I cant tell which need the roman numerals or which I actually have to switch the 2+, 1- how would you determine the charge and roman numeral! Forgive me for my spelling I have 4 stitches in my finger. 586833758[/snapback] i think the Cesium II chromate is the one for the roman numeral, but u should check this with somebody else to be sure for this. Link to comment Share on other sites More sharing options...
oddcrap Posted November 21, 2005 Author Share Posted November 21, 2005 Anyone! ? Link to comment Share on other sites More sharing options...
Daem0hn Posted November 21, 2005 Share Posted November 21, 2005 you have to make it so that the total charge of the atom = 0 using cesium carbonate as an example the charge on cesium is +1 carbonate is CO3 usually which has a valance of -2 therefore cesium carbonate should be Cs2(CO3) to make the charge 0, you need ot have the same amount of positive charge as you have negative charge you have -2 negative charge, and +1 positive charge, so you need 2 times as many positive ions to make a 2 positive charge (hence Cs2) Link to comment Share on other sites More sharing options...
Recommended Posts