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CHEM 1500, Week 6

by: D Holley

CHEM 1500, Week 6 CHEM 1500

Marketplace > Ohio University > Chemistry > CHEM 1500 > CHEM 1500 Week 6
D Holley

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Little bit of week 5 and all of week 6.
Concepts in Chemistry
Corey Beck
Class Notes
General Chemistry
25 ?




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This 2 page Class Notes was uploaded by D Holley on Sunday October 2, 2016. The Class Notes belongs to CHEM 1500 at Ohio University taught by Corey Beck in Fall 2016. Since its upload, it has received 4 views. For similar materials see Concepts in Chemistry in Chemistry at Ohio University.


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Date Created: 10/02/16
Week 6 CHEM 1500 9/27 & 9/29 This week and a little bit last week we began dabbling in covalent bonds and polyatomic ions.  This material is only vaguely explained, I would suggest seeking help during office hours/SI  sessions or during class and definitely looking over the chapter (6) and working through the  worksheets.  If you do not understand this now, you will get left behind very quickly. In our little preview last week Dr. Beck informed us that on the left side of the periodic table are  the metals and they lose electrons, also on the right side of the periodic table or the non­metals  and they gain electrons. So, for covalent bonds we learned a few things. When two bonds are covalent, they both share all of the electrons that are present and there becomes a shape difference. The negative on the  outside is attracted to the positive on the inside, therefore the bond becomes oblong and its  electron density is deformed. The electrons will end up overlapping between the two protons.  And for polyatomic ions, we learned a little more. Polyatomic ions can be read as many atomic  ions. One will give up an electron and one will gain an electron. There are 7 polyatomic ions we  will visit frequently in Chemistry. You will need to memorize them: Ammonium Nitrate Hydroxide Carbonate Chlorate Phosphate Sulfate You will need to memorize the name, the formula associated with the name and the charge  associated with the formula. Ammonium = NH4 with a positive 1 charge. Nitrate = NO3 with a negative 1 charge. Hydroxide = OH with a negative 1 charge. Carbonate = CO3 with a negative 2 charge. Chlorate = ClO3 with a negative 1 charge. Phosphate = PO4 with a negative 3 charge.  Sulfate = SO4 with a negative 2 charge. These are written with subscripts and superscripts. The charge is the superscript; it can be written with the plus/minus in front of or following the number of the charge (­2, 2­). We do not use a  one as a superscript, so if the polyatomic ion has a charge of negative one, the negative sign is  the only thing in the superscript.  Ammonium is the only positive polyatomic ion we will be working with. There are also 7 diatomic ions you will need to memorize. If you look on the periodic table they  form the number 7 facing Hydrogen. They are also go down the 7  column: H2 N2 O2 F2 Cl2 Br2 I2 Lastly, remember that exo means out and indo means in. Also, always use parenthesis around the ion when balancing charges. Have a great weekend! 


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