How are meteorites and meteors different?

meteorites are found in space and meteors are not.
meteorites usually burn up in the atmosphere, but meteors do not.
meteorites are larger than meteors.
meteorites have struck the earth's surface, but meteors have not.

The amount of iron in ore can be quantitatively determined by titrating a solution of the unknown with a standard solution of dichromate, cr2o72−. the net ionic equation is 6fe2+(aq)+cr2o72−(aq)+14h+(aq)→6fe3+(aq)+2cr3+(aq)+7h2o(aq) part a the titration of 25.0 ml of an iron(ii) solution required 18.0 ml of a 0.230 m solution of dichromate to reach the equivalence point. what is the molarity of the iron(ii) solution?