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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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Julieoct Julieoct
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11 years ago
I get the difference between an ionic bond and a covalent bond, but how do I know which is which in a molecular expression? For instance   H-C    indicates a covenant bond, and   H=C    represents a double covalent bond. What would indicate an ionic bond? These expressions are pretty self explanatory, just like H2O, but when I get into larger and more complicated molecules I can't help but get to wondering. Thanks.
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11 years ago
The line (-) only represents a bond, you have to look at the elements and their properties in order to find out what the bond is; for example H-O is a covalent bond as both elements are non-metals but  Mg-O is an ionic bond. Simply, ionic bonds form between metals and non- metals.
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11 years ago
Unfortunately we don't normally show an ionic bond in an equation,.However if a question relates to show an ionic or net ionic equation then the ionic bond is clearly shown.

e.g. Silver nitate and sodium chloride.

The molecular equation is   AgNO3  +  NaCl    =   AgCl + NaNO3

Ionic equation is       Ag+  + NO3-   +  Na+   +  Cl-  =  AgCl  +  Na+  +  NO3-

net ionic equation     Ag+  +  Cl-    =    AgCl      The sodium and nitrate ions are unchanged.
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