PLEASE HELP M How are the processes of melting and freezing similar?

They are both processes that physically change a substance.
They are both processes where heat is absorbed by a substance.
They are both processes where heat is released by a substance.
They are both processes that chemically change a substance.

Please help will give 25 points

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h

What happens when the temperature of a solution increases?

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.