The only way to know a chemical reaction has take place is to
•Check to see if a new substance(s) are formed
•Check to see if there was a color change
• Check to see if there was a gas released
•Check to see if the temperature changes.

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

Water undergoes a large change in density at 0 ∘ c as it freezes to form ice. calculate the percent change in density that occurs when liquid water freezes to ice at 0 ∘ c given that

50 points! need answer asap. what type of organic compound contains the following functional group? (2 points)