Can somebody please help me!!

The reaction q+r2=r2q is found to be first order in r2 and

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?