why the recrystallization of the diels-alder product, 9,10-dihydroanthracene-9,10-dicarbo xylic anhydride, was only approximately 60%?
a - the product evaporated with the solvent during the recrystallization
c - the product is partially soluble in xylene
d - there was some lost by sublimation

How much energy is made when a pice of wood burns. how do you know

Why is silver chloride is an ionic compound

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.