Fifteen grams of a liquid plastic are frozen in a physical change that increases the volume. what can be known about the plastic after the change? it will weigh more than 15 grams. it will have an increased density. it will still weigh 15 grams. it will still have the same density

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.