A substance is said to hygroscopic if it absorbs
(a) Carbon (IV) oxide from the atmosphere
(b) from the surrounding
(c) Moisture from the atmosphere to form
a solution
(d) Moisture from the atmosphere without
dissolving in it.

What are the three major branches of natural science? • earth and space science, life science, physical science •earth and space science, physical science, chemistry •physical science, life science, chemistry •life science, chemistry, physics

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?