Chapter 1-2 & some of 3
Chapter 1-2 & some of 3 Chem 1305
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This 4 page Class Notes was uploaded by Dorothy Stewart on Saturday August 29, 2015. The Class Notes belongs to Chem 1305 at University of Texas at El Paso taught by James E. Becvar in Summer 2015. Since its upload, it has received 49 views. For similar materials see general chemistry in Chemistry at University of Texas at El Paso.
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Date Created: 08/29/15
Chem 1305 Week 1 Chapter 12 Scienti c Notation 50390 X 10quot3 g 00050390 How many Sig g are there in 50390 x 10quot3 g There are ve 50390 would be the signi cant gures here Zeros at the right with no decimal 1 I 100 1 sig g When multiplying sig gs you must end up with a product containing the same amount of sig gs as you were multiplying with 3 x 12 36 BUT since you multiplies one sig g times two sig gs your end product equal 1 sig g so you would round 36 to 40 3 X 12 36 l 40 1 Sig g so 40 would be your answer Examples 1 60 one sig g 2 60 two sig g 3 102 three sig gs Zeros inbetween sig g are considered signi cant 4 10000 5 sig gs numbers to right of decimal are signi cant Scienti c Notation 0004 4 X 10quot4 62300 623 X 10quot4 What is an extensive variable quantities depend how big chemical are What is an intensive variable does not depend on the amount volume You will have to be able to distinguish extensive and intensive parameters on EXAM 1 micro l u l 10quot6 Dimensional analysis Chage quantity you have to get to another quantity in terms of units Covert 63 hours to seconds hr x 60 min1hr 605ec 1 min 6 3 63th 60 min 1hr 60 sec1min 6 3 x 3600 sec ON THE EXAM YOU MUST SHOW ALL WORK CHAPTER 2 Periodic Table Elements to the RIGHT of the staircase are elemental atoms all by themselves do not conduct electricity Nonmetals are all by themselves are to the left of staircase are non elementals conduct electricity Metal atoms can lose electrons and form ions charge Na K Squot2 Cl l anion carry charge and end in ide monatomic Ending in ium water soluble Protons Neutrons nucleus Must learn symbol and name for elements inclucing Group I Alkali metals l zero charge hydrogen 0 Lose 1 electron o Cations 1 ion 0 Group II Alkaline gt Earth metals 0 2 ions 0 lose 2 electrons Group Vii Halogens Group VIII l Noble gases Don39t lose electrons Diatomic 2 atoms Monotamic 1 atom Noble gases nonmetals every elements essentially wants to be a noble gas Diatomic elemental species H2 N2 O2 F2 Cl2gases Br gas Br2 liquid l2 solid Polyatomic P4 5 S8 Learn to associate to symbol Do NOT need to memorize numbers EXAM WILL CONSIST OF SIG FIGS DIMENSIONAL ANALYSIS USAGE Abvogadros 6022 x 10quot23 602 sextillion c12 atoms Covered in chapter 3 CHAPTER 3 Elements exist as isotopes Pure Carbon contains c12 and c13 atoms difficult to separate these atoms c12 l nuclei with 6 protons amp 6 neutrons c13 l nuclei with 6 protons amp 7 neutrons Nucleions particles of nuclei 0 Not many c13 atoms 0 Different elements have different of isotopes Different elements have different isotopes of protons distinguishes elements