1. to form a solution,
one substance must dissolve in another
a solid must dissolve in a liquid
the solvent must be water
a gas must dissolve in a liquid
2.a salt is dissolved in water, which has a boiling point of 100°c. the boiling point of the solution will be
greater than 100°c
less than 100°c
exactly 100°c
exactly 0°c
3.during the formation of a solution, energy is
either released or absorbed
neither released nor absorbed
released only
absorbed only

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.