In what order will the following amino acids be eluted from a column of Dowex 50 ion exchange resin is used instead by a buffer at pH 6: arginine, tryptophan, aspartic acid,
histidine, and leucine? Would the order change if it was Dowex 1?

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false