There are two naturally occurring isotopes of rubidium. Rb85 has a mass of 84.9118 u. Rb87 has a mass of 86.9092 u.

Determine the abundance of each isotope.

Rb85 abundance:

Rb87 abundance:

Energy is released during which phase changes? check all that apply. boiling condensing depositing freezing melting subliming

How many atoms of oxygen are contained in 160 grams of n2o3

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.