6. A TLC analysis of a sample composed of o-xylene (1,2-dimethylbenzene), o-toluic acid (2-methylbenzoic acid), and o-cresol (2-methylphenol, or 1-hydroxy-2-methylbenzene) gave the plate below. Calculate the Rf values and match the three compounds to the three spots. Explain your reasoning.

Esign techniques and materials that reduce the negative environmental impact of a structure are referred to as

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.