6. Use Lewis structures for the elements and so suggest a structure for the compound CCl2F2 called Freon-12.
7. Suggest why sodium exists as Na+ and not Na2+ in its compounds.
8. In water molecules the O atom attracts the electrons in the H-O bonds more strongly than the H atom does. What effect will this have on the position of the electron pair in each of the H-O bonds? Then explain how this accounts for water being a liquid at normal temperatures, rather than a gas (as for such a small molecule).
9. a molecule of glucose has the structure. Try to explain why this compound is so soluble in water.
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To create Lewis structures you need to look up on the Periodic Table how many valence (outer) electrons a compound has. In the case of F, it has seven outer electrons. Therefore, you place 7 electron dots around each F, and put them in pairs as much as you can. In so doing, you will see that each F has a single unpaired electron leftover. Therefore, to combine the two F atoms, you create a single covalent bond, each F atom sharing one atom in the bond, thereby giving each F atom eight electrons now. (Check out the attached graphic which illustrates all the Lewis and stick formulas.)
You do the same thing for NH3 as well, where N has five electrons, made up of one pair and three singles. Why do we put the five electrons around N like that? Each of the N singles can pair up with the single electron on each H to form three covalent bonds. Therefore, N ends up with 8 electrons, and of course, H with only two (which is all it needs).
Oxygen has 6 electrons in its outer shell---two pairs and two lone pairs. Each lone pair shares with the single electron in hydrogen to form two covalent bonds. As a result, ...
822 words answer 4 questions on Lewis structures.