Why does an evaporating liquid cool down, according to the kinetic molecular theory? a. heat is required to evaporate a liquid. b. heat is lost through elastic collisions. c. the highest velocity molecules are lost. d. heat must be dissipated to break the liquid bonds.

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

Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?

Which of the following are acids or bases? 1. sodium hydrogen 2. barium hydroxide solution 3. carbonate solution