CHEM 2620H Lecture 1: Lecture 1 Introduction
10 Jan 2019
School
Department
Course
Professor
Document Summary
Hydrogen bonding: hydrogen bonds change in structure when they freeze, they go into a crystal structure, when melting it, we lose that structure, because electronegativity is higher, hydrogen bonding does not occur. Ice is less dense than water because it floats. Seasonal changes of a water body: during summer, less oxygen is found at the bottom than the top, during winter, more oxygen is found at the bottom than the top, trapped. Addition of salt to water: decrease vapor, increase boiling point, decrease freezing point, increase density, decreased temperature of maximum density. Hydration: when you put an ion into the water, the water molecules will shield it, this process is known as hydration, the larger the ion, the lower the hydration. The hydrological cycle: residence time the time water stays within an environment, total/flux, total water in beaker/flux (rate) Important definitions: homogenous reactions reactions that occur within 1 phase, heterogenous reactions reaction that occurs between multiple phases.
