What is the BEST way to determine if a chemical change has occurred? 1. try and ignite the substance

2. examine the properties before and after the change

3. try and melt the substance

4. see if you can reverse the process

2. examine the properties before and after the change

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.