Mid-Year Review

Chemistry, Earth History, Infectious Dieases, Lithosephere

Chemistry-8.P.1- Understnad the properties of matter and changes that occur when matter interacts in an open and closed container

Physical Properties

  • Can be observed or measured without changing it
  • odor, mass, density, volume, color and state
  • A characteristics that you can observe without changing the composition of the substance
  • Describes how something looks, smells, feels, sounds or tastes

Chemical Properties

  • Describes matter based on its ability to change into new matter with different properties
  • Flammability, reactivity, oxidation and toxicity
  • These properties can only be observed during a chemical reaction
  • A characteristic that you can only observe by changing the identify of the substance
  • Describes how something reacts with something else

Physical Change

  • Does not form a new substance
  • any change that does not involve a change in the substances chemical identity
  • Can be reversed
  • Ex: Rocking chair, Wood Chipper, Ice cube

Chemical Change

  • one or more substances are changed into new substances that have new and different properties
  • chemical change cannot be reversed
  • any change in matter that results In the formation of new chemical substance
  • Ex: Frying an egg, Burning wood, cooking, eating

Elements, Compounds and Mixtures

Elements: Building Blocks of matter made of atoms

  • Each one has its own symbol
  • contains one type of atom
  • Ex: Carbon(C), Gold(Au), Nitrogen(N), Mercury(Hg)

Compounds: Substance formed when two or more elements chemically combine

  • Made of 2 or more elements
  • can only be separated chemically not physically
  • Ex: H2O, C6H12O2, NacL

Mixture: Combination of two or more different substances that are mixed not combined


8.E.2- Understand the history of Earth and its life forms based on evidence of change recorded in fossil records and land forms.