


What is the difference between a molecule and an ion?


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Key Concepts
Molecule
Ion
Chemical Bonding
Three binary compounds are represented on the following drawing: red with red, blue with blue, and green with green. Give a likely formula for each compound.
Given the following values for steps in the formation of CaO(s) from its elements, draw a Born–Haber cycle similar to that shown in Figure 6.7. Eea1 for O1g2 = -141 kJ/mol Eea2 for O1g2 = 745.1 kJ/mol Heat of sublimation for Ca1s2 = 178 kJ/mol Ei1 for Ca1g2 = 590 kJ/mol Ei1 for Ca1g2 = 1145 kJ/mol Bond dissociation energy for O21g2 = 498 kJ/mol Lattice energy for CaO1s2 = 3401 kJ/mol
Label the following species as molecules or ions. (a) NO3– (b) NH4+ (d) CH3CO2–
Label the following species as molecules or ions. (c) NO2
How many protons and electrons are in each of the following ions? (a) Be2+