Which of these would most likely be considered a pure substance? a. Tap water
b. Red Bull
c. Water vapor
d. The air we breathe
e. A rock from your backyard

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Which type of orbits are found in the principal energy level n = 2 a - s b - s, f c - s, d d - s, p e - s, p, d

Which of the following statements about acidic water is true? a. acid has no effect on the h, o molecules. b. the solution contains a larger number of oh ions than h, o ions. c. the solution contains a larger number of h, o ions than qh ions. d. the solution contains an equal number of h, o ions and oh ions. none of the above e.