Limiting reaction calculations ? ? can someone me understand this ? i’ve been trying for days lol

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

Apump contains 0.5 l of air at 203 kpa.you draw back on the piston of the pump, expanding the volume until the pressure reads 50.8 kpa. what is the new volume of the air pump

Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)