Which of the following accurately characterizes the process of freezing?
because energy is released, freezing is an exothermic process.
because energy is absorbed, freezing is an exothermic process.
because energy is released, freezing is an endothermic process.
because energy is absorbed, freezing is an endothermic process.

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

Ammonia and oxygen react to form nitrogen monoxide and water, like this: 4nh3 (g) + 5o2 (g) → 4no (g) + 6h2o (g) also, a chemist finds that at a certain temperature the equilibrium mixture of ammonia, oxygen, nitrogen monoxide, and water has the following composition: compound pressure at equilibrium nh3 65.1atm o2 31.3atm no 62.7atm h2o 65.8atm compound pressure at equilibrium nh3 65.3 atm o2 7.79 atm no 12.1 atm h2o 65.8 atm calculate the value of the equilibrium constant kp for this reaction. round your answer to 2 significant

Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g.  what is the percent by mass of water in the hydrate?   %