Which of the following is a true statement? A:Water expands when it freezes.
B:Water shrinks when it freezes.
C:Water loses mass as it freezes.
D:Water increases in mass as it freezes.

Which of these best describes an ionic bond?

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

Which of these conditions most likely produces an unstable isotope?