Please help me with these questions ASAP, they're important for my physical science notes. 1: Explain how the bonds between water molecules affect its properties.

2: What does hydronium and hydroxide have to do with the pH scale?

Pls answer in detail, ty :))

The average atmospheric pressure on earth is approximated as a function of altitude by the relation patm = 101.325 (1 − 0.02256z)5.256, where patm is the atmospheric pressure in kpa, and z is the altitude in km with z = 0 at sea level. determine the approximate atmospheric pressures at atlanta (z = 306 m), denver (z = 1610 m), mexico city (z = 2309 m), and the top of mount everest (z = 8848 m).