What does flame do to the separated Hydrogen and Oxygen that made up the water?

The plant food contains nh4)3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion

Asubstance is held in an open container. its particles move past one another at random speeds but do not leave the container. heat is removed from the system, and the particles slow down. when enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them. when this happens, the substance enters its solid state. the process described above is known as .

What the blanks in these lines are ?