1. What information does a molecule's structure give? >> The molecules structure helps you understand how the atoms of a molecule are hooked together. You see how the atoms bond and get an idea of the nature of a molecules chemical and physical properties. You get information about bond lengths, bond angles, and functional groups on the molecule.
2. How many resonance structures can be drawn for CO3^2-? Show the electron dot structures for each.
>> You can draw at least 3 separate structures that explain the stability of the CO3^2- ion through resonance. See the 1st link to observe the actual structures drawn out.
3. How is an intermolecular force different from a bond? >> An intermolecular structure is one that results from three well defined forces called London dispersion forces, dipole-dipole interactions, and hydrogen-bonding interactions. A chemical bond results from the direct sharing of one or more pairs of electrons between two atomic nuclei. See the 2nd link for more information on intermolecular forces.
4. What types of molecules have the following intermolecular force
a.) Dispersion Force >> Common examples are the diatomic gases which condense due to dispersion forces.
b.) Dipole Interaction >> molecules that have molecular dipoles, like CH2Cl2, (CH3)2C=O, (CH3)3N, and others display dipole interactions.
c.) Hydrogen Bonding >> Molecules that have O, N, or F directly bonded to one or more H atom will display hydrogen bonding. Examples are H2O, CH3OH, NH3, HF, and numerous others.
5. Would you expect carbon monoxide Co and carbon dioxide CO2 to be polar or non polar molecules? >> CO is a molecule that will have a dipole because of the differences in electronegativity between the two atoms. CO2 is a molecule that is linear and has the molecular structure O=C=O. Because of its structure the two ends of the molecule that are polar cancel out the polarity of the whole molecule.
6. Which would you expect to have the higher melting point, CaO or CS2? Why? >> CaO is a compound between a metal and a nonmetal. The result is described as an ionic, or salt-like compound. These classes of compounds have high melting points (2572 °C). CS2 is a molecular compound which has a relatively low melting point (-110.8 °C)