Notes
Slide Show
Outline
1
Chapter 6
  • Calculations:
  • Formula Masses, Moles, and Chemical Equations
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Diamond is a covalent  compound with many carbon atoms
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Molar mass: The mass units
  • Fig. 6.1
  • Oranges may be bought in units of mass or units of amount.
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First chemical compound need to be weighed
  • Fig. 6.2
  • A basic process in chemical laboratory work is determining the mass of a substance.
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Mole is a counting unit used by chemists
  • Fig. 6.3
  • Everyday counting units.
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Unlike a dozen Avogadro’s  number is large: 6.0022 x 1023
  • Fig. 6.4
  • Amadeo Avogadro was the first scientist to distinguish between atoms and molecules.
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Formula Masses in grams gives a Mole of a chemical compound
  • Fig. 6.5
  • The mass of a mole depends on the substance.
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To get the Formula Masse first find the types of atoms in the compound
  • Fig. 6.6
  • A computer-generated model of the molecular compound N2O4.
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Moles multiplied by Avogadro's number gives number of atoms and molecules
  • Fig. 6.7
  • In solving chemical-formula-based problems, the only “transitions” allowed are those between quantities (boxes) connected by arrows.
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Law of conservation of mass/atoms
  • Fig. 6.8
  • When 16.90g of the compound CaS is decomposed into its constituent elements, the Ca and S produced has an identical mass of 16.90g.
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Conversion factors in chemical calculations: Stoichiometry
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Mole conversion to grams and particles
  • Fig. 6.9 In solving chemical-equation-based problems, the only “transitions” allowed are those between quantities (boxes) connected by arrows.
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What does 16-20-0 means in fertilizer?
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Air bag should have right amount reactants to produce gas or baby will crush.
  • Fig. 6.10
  • Testing apparatus for measuring the effects of air bag deployment.