Thursday, November 18, 2010

Thursday November 18

Yesterday we started the class by picking up pages 21-25 plus another sheet. After picking up the pages, we all sat down for class. Some of the people did not finish building their molecules from two days ago so we then took the time to do that. Mrs. M went around stamping like crazy. After we finished the lab, we did page 20. When we completed 20 we started polar and nonpolar covalent bonding. One of the sheets we got was a periodic tables with a bunch of numbers with the different elements. We got half way through page 21. The rest of it was for homework

Today we started class by picking up 4 pages. After we all settled down we started on the different types of bonds. There are three kinds of bonds; Polar covalent, non-polar covalent and ionic. A polar bond is when one electron has a stronger electronegativity than the other in the bond and holds the electron closer to it's nucleus. Non-polar covalent bonding is when the electron being shared is evenly distributed between the two atoms. An ionic bond is when the pull from one atom is so strong that it rips the electron from an other atom. To find out what kind of bond the molecule has you take the electronegativity of the two atoms and subtract the bigger one from the smaller one. If the difference is less than or equal to 0.4 the bond is non-polar covalent. If the difference is 1.7 or higher the bond is ionic. Anything inbetween those is polar covalent. After learning this we went through and did pages 22-25.

Homework: Page 26 and webassigns & chemthink if you have not finished them

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