What happens when a piston is used to decrease the volume of a contained gas? a. Fewer gas particles exert a force on the piston.
b. The piston’s pressure on the gas becomes greater than the pressure exerted by the gas on the piston.
c. Gas particles collide more frequently.
d. Gas particles leak out of the container.

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt