How would you synthesize the following?

Is the flow of energy during vaporizing more like the flow during melting or during freezing

Why is it that 85.48 rounded to two significant figures is 85 and not 86?

If you used the method of initial rates to obtain the order for no2, predict what reaction rates you would measure in the beginning of the reaction for initial concentrations of 0.200 m, 0.100 m, & 0.050 m no2.