An unknown solution is tested with bromothymol blue and bromocresol green. The bromothymol blue solution turns green and the bromocresol green turns blue. What could the unknown solution be? Answers:

A. HCl
B. H2O
C. NaOH
D. CH3COOH

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

How have the greenhouse gasses increased from the year 2000 to 2018