The melting and freezing points of a substance are the same temperature.
a. true
b. false

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?