Are groups of Atoms lined up inside a material which causes the material to be magnetized

Can someone me with questions 15 to 17 plz.

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) in an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect? ultraviolet light dim blue light bright red light bright yellow light

In a reaction (at equilibrium) that makes more moles of gas than it consumes, what is the effect of increasing the pressure?