Plz help! :D

What element is as hard as magnesium?

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.

Which sample at stp has the same number of atoms as 18 liters of ne at stp