A Matter of Fact

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A Matter of Fact

• Mixtures, Elements and Compounds

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Lets see what you already knowfrom previous
lessonsDiscussion

• 1. Is air only made up of O?
• 2. What is matter?
• 3. What is mass?
• 4. What are the four states of matter?

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Lets see how much you remembered.

• 1. No, it is also composed of other gases such
  as, N,C, and other gases.
• 2.Anyting that takes up space.
• 3. Amount of matter.
• 4. Solid, Liquid, Gas, and Plasma.

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Lesson Objective

• Compose the right questions to ask when
  identifying matter.
• Distinguish between an element, compound, and a
  mixture.
• Define a heterogeneous mixture and give an
  example.
• Define a homogenous mixture and give an example.

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Mixtures, elements, compounds

• All matter can be classified as mixtures,
  elements and compounds.

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First, we must understand what the terms mean

• Element- only one kind of atom.
• Ex. O- is only oxygen
• Ex. Fe- is only Iron
• Do not write question (class discussion)
• Can you think of another element that is only
  made up of one atom we discussed in past lessons?

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• Compound- is two or more different elements
  combined.
• Ex. H2O-Water
• Ex. NaCl-Salt (Sodium Chloride)
• Do not write question (class discussion)
• Can you think of another compound that is only
  made up of two or more different elements we
  discussed in past lessons?

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• Mixture- two or more substances that are not
  chemically combined with each other and can be
  separated by physical means.

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Why isnt it a good idea to classify matter by
its phases?

• Because one kind of substance can exist in more
  than one phase such as H20. And matter changes
  phases rather easily.

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Why isnt matter classified according to its
physical characteristics, such as color?

• Scientists wouldnt find it very useful to group
  gold, sunflowers, and the sun together.

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Scientists ask themselves these questions?

• Is the matter uniform throughout?
• Can it be separated by physical means?
• Can it be separated by chemical means?

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• By asking these questions scientists can classify
  matter
• Todays lesson will focus on classifying matter
  as a mixture.

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Is it uniform throughout?

• If the answer is no, the matter is a
  heterogeneous mixture.
• Does not appear to be the same throughout.
• Particles are large enough to be seen and to be
  separated from the mixture.

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Examples of heterogeneous mixtures

• Sand and pebbles
• Oil and water
• Oil and Vinegar

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Is it uniform (even) throughout?

• If the answer is yes, the matter is homogeneous
  (looks the same throughout).
• That leads us to another question.

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Can it be separated by physical means?

• If the answer is yes, the matter is a homogeneous
  mixture or solution.
• Ex. Sand can be physically separated from water.

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Homogeneous Mixtures

• A mixture that appears to be the same throughout.
• The particles that make up the mixture are very
  small and not easily recognizable.

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Mini Lab Time ?

• Homogenous ????
• Materials ?????

• Heterogeneous???
• Materials????

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Mini Lab ?

• Homogenous
• Materials
• -Water
• -Sugar
• -Salt
• -Spoon
• -Clear Cups

• Heterogeneous
• Materials
• -Water
• -Oil
• -Vinegar
• -Sand
• -Pebbles
• -Clear Cups