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Chemistry —The study of the properties of matter and how matter changes. PowerPoint Presentation
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Chemistry —The study of the properties of matter and how matter changes. - PowerPoint PPT Presentation


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Chemistry —The study of the properties of matter and how matter changes. Element —a substance that cannot be broken down into any other substances by chemical or physical means. Example: Carbon--C All the matter around you is composed of one element or a combination of two or more elements.

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Chemistry—The study of the properties of matter and how matter changes.
  • Element—a substance that cannot be broken down into any other substances by chemical or physical means.
  • Example: Carbon--C
  • All the matter around you is composed of one element or a combination of two or more elements.
  • Atoms—Smallest part of an element. All atoms of an element have the same chemical properties of atoms of other elements.
  • Molecule—a combination of two or more atoms. Some molecules are made of atoms that are alike, as is oxygen gas (O2) that you breathe.
compounds and mixtures
Compounds and Mixtures
  • Compounds—A substance made of two or more elements chemically combined. They have a chemical formula.
  • Examples: Sugar, Salt
  • Mixtures—Substances that are mixed, but NOT chemically combined. They do not have formulas and can be separated by physical means.
  • Examples: Dixie Cheeseburger, Iron and Sand
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Heterogenous mixture—mixture you can see the different parts

  • Example—lasagna
  • Homogeneous mixture—mixture that looks the same throughout
  • Example-milk, Crest toothpaste
changes
Changes
  • Physical changes—A change that alters the form or appearance of a material, but it does not change the material into a new substance.
  • All phase changes are physical.
  • Examples: tearing paper, evaporating water.
  • Chemical changes—A change in matter that produces a new substance.
  • Example: Burning wood
signs of chemical changes
Signs of Chemical changes:
  • Signs of a chemical change:
  • A precipitate forms. (A solid that forms when two liquids are mixed.)
  • Color Change
  • Gas Production (You should see bubbles.)
  • Changes in temperature
  • Changes in Properties