Chem 42, Week 2 Notes
Chem 42, Week 2 Notes Chem 42
Santa Rosa Junior College
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This 3 page Class Notes was uploaded by Ariana Notetaker on Saturday October 1, 2016. The Class Notes belongs to Chem 42 at Santa Rosa Junior College taught by Fassler in Fall 2016. Since its upload, it has received 4 views. For similar materials see Introduction to Chemistry in Science at Santa Rosa Junior College.
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Date Created: 10/01/16
Atoms - what are they made of? Charge Determines the Protons +1 element (atomic number) Affects the mass of Neutrons 0 the atom (isotope) Affects the charge Electrons -1 (ion) Identifying an atom mass# A element symbol (protons+neutrons)ZX -atomic # -charge on nucleus Example: 39 K —> potassium -39 19 Isotope - same element, different mass Example: 12 —> Carbon -12 13 6 C —> Carbon -13 6 Q. What is the symbol of an atom of phosphorous with 16 neutrons? A. 15 protons 31 P . 15 16 neutrons Phosphorous -31 V. Nonmetals Metals Shiny Not shiny Flexible Not Flexible -ductile Not Conductors -maleable Not a metal Conductors Many will form diatomics -heat (F2H 2 B2 ) 2 -electricity Unit Analysis Conversion Factors allow us to change units 1m 3937in 39.37in = − >1== 1m 1m 1m Examples: How many meters tall is a 72 inch person? 72nches• 1m =11828m 3937inches How many inches are in 2 miles? 1 mile = 5280 ft 1 ft = 12 in 2mmies• 5280ft•12in=1126720nn 1mi 1ftt Your car gets 28 miles per gallon. How many km can you drive on 9.25 gallons of gas? 1 mile = 1.609 km 925gallons•28miles•1.609= 416.731km→ 4420km 1galon 11mile 416.731km was rounded to 420 km using sig ﬁgs
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