Posted by Ted on Saturday, January 26, 2013 at 5:23pm.
Assign oxidation numbers to each atom on each side and notice that the oxidation number does not change; i.e., Ca is +2 on the left and +2 on the right. Here is a good site to show how to determine oxidation numbers. Post if you still have questions but tell exactly what your problem is.
http://www.chemteam.info/Redox/Redox-Rules.html
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