The excess iron powder was put into the copper sulfate solution, and after the reaction, the excess iron powder was filtered paper was The excess iron powder was put into the copper sulfate solution, and after the reaction, the excess iron powder was filtered, and the residual substance on the filter paper was

The excess iron powder was put into the copper sulfate solution, and after the reaction, the excess iron powder was filtered paper was The excess iron powder was put into the copper sulfate solution, and after the reaction, the excess iron powder was filtered, and the residual substance on the filter paper was

Iron and copper, copper is replaced by iron, but iron powder is excessive, so there is iron powder and copper powder

The molecular formula of benzene homologues is C11H16. The molecule contains no other ring structure except benzene ring. There are two -CH3, two -CH2- and one -CH- in the molecule. The possible structures of the molecule that meet the above conditions are () A.3, B.4, C.5, D.6 Don't result, want to analyse process and solve problem train of thought, had better do this kind of problem law and method. The molecular formula of benzene homologues is C11H16. The molecule contains no other ring structure except benzene ring. There are two -CH3, two -CH2- and one -CH- in the molecule. The possible structures of the molecule that meet the above conditions are () A.3 species B.4 species C.5 species D.6 species Don't result, want to analyse process and solve a problem train of thought, had better do this kind of problem law and method.

In fact, there are several isomers!