Pure%20Substances%20and%20Mixtures

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Pure Substances and Mixtures

• Categorizing Matter

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• All matter in the universe is either a pure
  substance or a mixture.

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• Pure Substance
• Made of either a single element or one particular
  kind of compound
• Has a definite composition
• H2O, NaCl, C, etc.
• Cant be broken down into simpler substances
  through physical changes
• Two Types of Pure Substances
• Elements
• Compounds

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• Element
• Consists of only one type of atom
• Au, Ag, C, Na, Br, K, H, etc.
• Compound
• 2 or more different atoms chemically combined
  together
• Composition is always the same
• Cannot be broken down using physical changes
• H20, NaCl, CO2, etc.

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• Mixtures
• Substances that have been combined physically (no
  chemical reaction)
• Homogeneous Mixtures solutions
• Homo same
• Mixture that looks the same everywhere
• Air, salt water, sugar water
• Heterogeneous Mixtures suspensions
• Hetero different
• Looks different throughout
• Mud puddle, blood, salad dressing, chocolate chip
  cookie, bird seed

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Element, Compound, or Mixture?
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Element, Compound, or Mixture?
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Element, Compound, or Mixture?
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Element, Compound, or Mixture?
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Element, Compound, or Mixture?
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Element, Compound, or Mixture?
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Element, Compound, or Mixture?
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Element, Compound, or Mixture?
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Exam Review and ET

• 9-12

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• 9. A heterogeneous mixture is one that is not
• a. uniform throughout.
• b. made of two or more liquids.
• c. easily mixed together.
• d. edible by humans.

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• 10. Which of the following is a homogeneous
  mixture?
• a. salad dressing
• b. rubbing alcohol
• c. gelatin
• d. orange juice with pulp

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• 11. A compound differs from a mixture because it
• a. always remains frozen even at high
  temperatures.
• b. is formed from two cations.
• c. always contains the same elements in the same
  proportion.
• d. can form only in the presence of heat energy.

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• 12. Each molecule of table sugar, C12H22O11,
  contains
• 0 atoms of carbon.
• 6 atoms of carbon.
• c. 1 atom of carbon.
• d. 12 atoms of carbon.