Which of the following sets represents a pair of isotopes?
a. 14c and 14n
b. br and br2
c. 9b and 11b
d. 16o and 16o2-

What is the [oh-] in a solution with a poh of 3.90

Water is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place? from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma

What type of electromagnetic waves does the human eye see as the colors red blue or green a visible light waves b radio waves c infrared waves d microwaves