Answer:
1 is the chemical formula for water, meaning that each of its molecules contains one oxygen and two hydrogen atoms.
2 a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.
3 Chemical abbreviation for sodium chloride (table salt)
The greatest visual evidence you can use when trying to determine if a solution is saturated is to look and see if everything in the test tube is a single color and a single consistency.
