Consider the following statements regarding NMR spectroscopy. Determine whether each each statement is true or false. 1. The TMS protons are highly shielded and appear downfield of other organic protons in an NMR spectrum.
2. NMR spectroscopy requires a nucleus having non-zero electron spin.
3. A typical value for the chemical shift of methyl protons is 1.2.
4. Spin-spin splitting arises from interactions of one proton with a neighboring nucleus.

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

Each of the following compounds contains a metal that can exhibit more than one ionic charge. provide systematic names for each of these compounds. (a) cr(clo3)6 (b) mo(cn)6 (c) cr2(so3)3 (d) v(clo2)2 (e) v(cn)5 (f) os(clo2)4

Why do scientists look for patterns in the world? a. patterns can explain observations. b. patterns never change, no matter what. c. patterns are easy for scientists to detect. d. patterns are all the same, through all time.