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CHEM 141 - Class Notes - Week 3

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CHEM 141 - Class Notes - Week 3

School: Saint Martin's University
Department: Engineering
Course: General Chemistry
Professor: Brandy Fox
Term: Fall 2016
Tags: atomictheory, Chemistry, and Chemical Bonding
Name: Chemistry 141 Week 3
Description: these notes go over Atomic theory, subatomic particles of atom, and an intro to covalent, ionic, and metallic bonding.
Uploaded: 09/19/2016
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background image Monday 9/12  Atomic theory of matter, Atomic structure, Scientific method   Real scientific method builds on itself. If a hypothesis is accepted and contribute to body of 
knowledge.  
Law ­If testing yields constant observations  Theory ­ If supporting same hypothesis (cannot prove) supports it.     History of the atom  Democritus (460­390 BC)  “Atomos” building blocks  Plato/ Aristotle­  Theory without atomos, Atomic view of matter faded for 100’s of years    Sir Isaac Newton (1642­1727)­  Air is something invisible but in constant motion     ­Brought back atomic theory.   Dalton ­ “Grandfather of Chemistry” linked idea of atom to elements.  ­Quantified atomic theory.  1.Each element composed of atoms 
2. Each atom is the same in the element, different from all other elements 
3. Elements of one atom can not be changed into atoms of a different element 
4. Compounds are formed when atoms combine. Compounds always have same composition.  
 Predicted when A and B for compound will have small whole numbers. No A 3.45  ­ Law of  multiple proportions  ­Put together first table of related masses of the elements  1858­ Chemists solved problem of correct determination of molecular formulas and atomic 
masses.  
  Atoms  ­If you take apart atom, the subatomic parts to not act like the element  J.J Thomson­ With cathode ray found ray bent. There must be a magnetic field  ­When he put negative/positive plates, it bent towards positive meaning the force was negatively 
charged.  
­Forced ray to go straight to calculate mass to charge ration 
­ray was identical for any cathode­Electrons are universal 
Millikan­ Oil drop experiment. Measured rate of oil droplets falling on negatively charged plate.  Found they were all multiples, knew charge so could calculate mass.  
Pudding model­Negative particles in large positive field. 
To test: Shot positive charge though gold foil. Expected to see little change in path.  After testing. Some shot back at him.   ↳Nucleus proposed   ­Cloud of electrons around large lump of positive particles. 
 
 
 
Particle  Charge  Mass 

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School: Saint Martin's University
Department: Engineering
Course: General Chemistry
Professor: Brandy Fox
Term: Fall 2016
Tags: atomictheory, Chemistry, and Chemical Bonding
Name: Chemistry 141 Week 3
Description: these notes go over Atomic theory, subatomic particles of atom, and an intro to covalent, ionic, and metallic bonding.
Uploaded: 09/19/2016
2 Pages 16 Views 12 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
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