Unit A:Topic 2

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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

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
• 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?
• 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
• 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 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.

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
Mixtures
• There are two types of mixtures
• Mechanical mixtures
• Solutions
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 (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.
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
• 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

http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/molvie1.swfhttp://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/molvie1.swf