The Kb of hydroxylamine, NH2OH, is 1.10 x10-8. A buffer solution is prepared by mixing 120 mL of a 0.36 M hydroxylamine solution with 50 mL of a 0.28 M HCl solution.

Find the pH of the resulting solution.

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.

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

An observation that requires measurement is called quantitative observable or qualitative