COMPOSITION OF MATTER

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COMPOSITION OF MATTER

• Pure Elements
• Pure Compounds
• Mixtures of Elements and/or Compounds

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ELEMENTS COMPOUNDS

• ELEMENT Cannot be decomposed into 2 or more
  simpler substances by ordinary chemical or
  physical means (requires Nuclear process)
• COMPOUND Contains 2 or more chemical elements
  combined in FIXED PROPORTIONS

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ELEMENTS, COMPOUNDS MIXTURES
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LAW OF CONSERVATION OF MASS

• Mass is neither created or destroyed in a
  Chemical change

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LAW OF DEFINITE PROPORTIONS

• In given Chemical Compound, proportions by mass
  of elements are fixed, irrespective of how the
  compound was made, or its source of origin

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DALTONS ATOMIC THEORY OF MATTER

• 1. Solid Indivisible Atoms
• 2. All Atoms of Same Element Identical in All
  Respects
• 3. Atoms of Different Elements Have Different
  Masses
• 4. Atoms Indestructible in Chemical Reactions
• 5. Compounds formed from Elements in Small, Whole
  Number Ratios

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AVOGADROS NUMBER

• N 6.02214 x 1023

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AVOGADROS NUMBER

• One Mole of Substance contains Avogadros Number
  of Species (e.g. Atoms, Molecules, peanuts,
  whales)

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MOLAR MASS

• Mass of 1 Mole of Atoms of Element
• E.g. For H 1.008 g mol-1
• For O 15.999 g mol-1

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MASS SPECTROMETER

• Separates ions by mass/charge ratio.

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