If the components of a liquid hydrocarbon are to be separated by fractional distillation, the components should have A. Large differences between their boiling points
B. Very small differences between their boiling points
C. Large differences between their freezing points
D. Very small differences between their freezing points

What is important to study for nios grade 12 chemistry? i have only one month left.

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

Which is an example of a reversible physical change?