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Unit A:Topic 2. Mix and Flow of Matter. Important Vocab. matter particle theory matter pure substance mixture http://content.blackgold.ca/ict/Divison3/mixandflow/particle.html. After completing this lesson you will be able to.

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unit a topic 2

Unit A:Topic 2

Mix and Flow of Matter

important vocab
Important Vocab
  • matter
  • particle theory matter
  • pure substance
  • mixture
  • http://content.blackgold.ca/ict/Divison3/mixandflow/particle.html
after completing this lesson you will be able to
After completing this lesson you will be able to
  • identify the difference between a pure substance and a mixture, according to the particle theory of matter
  • explain the difference between a solution and a mechanical mixture
  • recognize that solutions are homogenous mixtures and mechanical mixtures are heterogeneous mixtures
  • describe solutions by using the particle theory of matter
  • identify common substances that are examples of pure substances, solutions, and mechanical mixtures
what is matter
What is Matter?
  • All substances are made of matter.
    • Matter is anything that takes up space and has mass
    • the particle theory of matter states that all matter is made up of tiny particles.
  • Matter can be divided into 2 categories:
    • Pure substances
    • Mixtures
pure substances
Pure Substances
  • A pure substance contains only one type of particle.
  • Substances don't usually occur in their pure form in nature, so in order to obtain pure substances, people must refine raw materials.
  • Some examples of pure substances are
    • gold,
    • aluminum, and
    • sugar.
mixtures
Mixtures
  • Mixtures are made of two or more kinds of matter combined together (ex. stew, pop)
  • Mixtures can be in the form of solids, liquids, and/or gases, in any combination.
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In each picture, there is an arrow that points to a mixture described in the list above. Write the letter that shows what kind of mixture it is.

  • a) a mixture of gases d) a mixture of gases in a liquid
  • b) a mixture of liquids e) a mixture of solids in a liquid
  • c) a mixture of solids f) a mixture of solids and gases
mixtures1
Mixtures
  • There are two types of mixtures
    • Mechanical mixtures
    • Solutions
mechanical mixtures heterogenous
Mechanical Mixtures (Heterogenous)
  • Mechanical mixtures are mixtures composed of two or more substances that remain visible even after they are mixed.
  • Think of how granola cereal or trail mix looks
    • the individual ingredients such as raisins, nuts, and dried fruit remain visible even after mixing.
    • Concrete is another example of a mechanical mixture — the components of the sand, lime, and water used to create it often remain visible.
mechanical mixtures heterogenous1
Mechanical Mixtures (Heterogenous)
  • Mechanical mixtures are also known as heterogeneous mixtures (uneven mixtures).
    • A salad dressing made of oil and vinegar is considered a heterogeneous mixture because its components — oil and vinegar — remain separate and distinct.
  • Think about a chocolate chip cookie. Would it be considered a mechanical mixture? Why or why not? Explain your answer.
solutions homogenous
Solutions (Homogenous)
  • Solutions are a type of mixture in which the pure substances within the solution mix together so well that they give the appearance of only one substance.
  • Ex. Juice, air, brass (copper and zinc), vinegar and water
in between mixtures
In-between Mixtures
  • Hard to determine if a mixture is heterogeneous or homogenous
  • Suspension: a heterogeneous mixture in which the particles settle slowly after mixing
    • Can be filtered
    • Orange juice, clay mixed with water
  • Colloid: a heterogonous mixture in which the particles do not settle
    • Ex. milk
    • particles in a colloid can be dispersed for an even longer period of time by adding an emulsifying agent to form an emulsion
      • mayonnaise
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http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/molvie1.swfhttp://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/molvie1.swf