What might be a good way of quickly telling if something is an element or a compound

Calculate the molarity of 48.0 ml of 6.00 m h2so4 diluted to 0.250 l .

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

The diagram below shows the movement of particles. what does this piece of evidence best support? the collision theory the maxwell-boltzmann distribution the effect of pressure on reaction rates the effect of temperature on reaction rates