What is the best definition for the freezing point of a substance? * It is the temperature at which a substance become cold.

It is the temperature at which a substance changes from a gas to a liquid

It is the temperature at which a substance changes from a liquid to a solid.

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

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.