Does copper react with calcium nitrate?

No,If Ca2+ is bonded to an anion which forms more stable compound with Ca2+ than that of NO3- ,then that anion will replace Ca2+ and the the reaction will occur between CaNO3 and That compound of Ca2+.

hmmm, are you sure? this could be related to the properties of calcium and not just a normal reaction. aluminum nitrate and aluminum react very violently. granted this could be due to the reducing effect of aluminum, but its essentially the same thing..