The freezing point of a substance is the
at
which it freezes.

An atom with 7 protons, 6 neutrons, and 7 electrons has an atomic mass of amu. (enter a whole number.) numerical answers expected! answer for blank 1:

What is produced from neutralization of an acid and a base? a. hydronium ions b. citric acid c. salt and water

How does science use models to gain a better understanding of concepts?