Can you evaluate gas systems and determine the outcome of changed conditions

Yes you can determine the outcome of changed conditions, for example you can determine that the volume of a balloon has changed if the size of the balloon changed in size. By finding this you can also figure out what caused the changed, the change in temperature or the amount of particles inside the balloon.

Use a magnet to separate iron, evaporate water, i'm not sure how to separate the other two i'm sorry but good luck

Aseasonal prevailing wind in the region of south and southeast asia, blowing from the southwest between may and september and bringing rain (the wet monsoon ), or from the northeast between october and april (the dry monsoon ).