How are iodine 131 and iodine 127 sub-atomically the same and sub-atomically different?
a. they each have 53 protons and 53 neutrons
b. they have the same number of protons and different number of neutrons.
c. they have the same number of electrons and different number of protons.
d. they have the same number of protons and different number of electrons.

If 200.0g of copper(ll) sulfate react with an excess of zinc metal, what is the theoretical yield of copper

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes