pentagon abcde is similar to pentagon rstuv. If DE = 18 and UV = 15, which of the following is not necessarily true?

The molality of calcium chloride (cacl2) in an aqueous solution is 2.46 m. what is mole fraction of the solute?

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures