Which best describes emerging scientific ideas?

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Which statement best describes the he properties of iconic compounds ?

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