CHEM 1A Study Guide - Midterm Guide: Boiling Point, Coordination Number, Carbon Tetrachloride

• School: UC-Irvine
• Department: Chemistry
• Course: CHEM 1A
• Professor: Ramesh D Arasasingham

Document Summary

# strontium ions = 8(1/8) + 6(1/2) = 4 strontium ions. # chloride ion = 8(1) = 8 chloride ions. Sr:cl = 4:8 = 1:2 = srcl2: determine the number of formula units per unit cell. There are 2 chloride ions in the formula, so (-1)(2) = -2. The chloride ions are located in the middle of the unit cell, indicating that they occupy tetrahedral holes. It is at point c where the physical properties of gas and liquid are the same and the two phases are indistinguishable. The slope of of line ab is positive. This indicates that the solid is denser than the liquid. This sketch shows the phase diagram of water. Water would have a negatively sloped line ab, indicating that the solid is less dense than the liquid. Line ad represents the phase changes of sublimation and deposition. When the pressure increases from 1 atm to 1. 5 atm, the boiling point decreases.