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Homework Help: chemistry

Posted by lyne on Wednesday, January 21, 2009 at 11:01pm.

Ca + Br2 --> CaBr2

its synthesis and the reason the reaction happens is stable electron configuration but i dont understand why.


Responses


chemistry - DrBob222, Wednesday, January 21, 2009 at 10:06pm
Synthesis because it's two elements combining to form a single product. Stable electron configuration because
Ca has two electrons as the metal (solid). It wants to give those two electrons up and if it does, then the last shell has 8 electrons in it (it is 1s2 2s2 2p6 3s2 3p6 4s2 as the metal. Losing the 2 4s electrons leaves it with 8 in the 3rd shell.) Bromine, as the element, has 7 electrons in its outside shell. It wants to gain 1 electron to make 8. So 1 Ca atom combines with 2 Br atoms, giving 1 electron to each Br, to make CaBr2. The Ca is now a +2 ion and the 2 Br atoms are Br^- ion. This is a typical ionic bond.



chemistry - lyne, Wednesday, January 21, 2009 at 10:09pm
okay but doesnt this happen in a lot of the synthesis ones then?

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