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Unit #1Unit #2Unit #3Unit #4Unit #5Unit #6Unit #7Unit #8Unit #9Unit #10
spacerUNIT # 2  
spacerspacerIntroduction
spacerspacerObjectives
spacerspacerReading


spacer2.1 Physical
spacerStates of
spacerMatter

spacer2.2 Physical &
spacerChemical
spacerProperties
spacer2.3 Physical &
spacerChemical
spacerChanges

spacer2.4 Classific-
spaceration of

spacerMatter
spacerPure Substances

spacerMixtures

spacer2.5 Energy
spacerPotential and Kinetic Energy

spacerEndothermic and Exothermic Reactions
spacerLaw of Conservation of Energy

spacerspacerProblems
   
Unit # 2 - MATTER AND ENERGY

  1. Identify which of the following as a pure substance or a mixture.

    • (a) salt, NaCl
      pure substance mixture

    • (b) air
      pure substance mixture

    • (c) brass.
      pure substance mixture

    • (d) H2O
      pure substance mixture

    • (e) beer
      pure substance mixture

  2. Identify which of the following pure substances are elements, and which are compounds

    • (a) mercury
      element compound

    • (b) rust, iron oxide
      element compound

    • (c) aluminum
      element compound

    • (d) tungsten
      element compound

    • (e) diamond
      element compound

  3. Identify which of the following mixtures are homogeneous or heterogeneous.

    • (a) beef vegetable soup

      homogeneous mixture heterogeneous mixture

    • (b) fog

      homogeneous mixture heterogeneous mixture

    • (c) water and gasoline

      homogeneous mixture heterogeneous mixture

    • (d) sugar dissolved in water

      homogeneous mixture heterogeneous mixture

    • (e) 14 carat gold

      homogeneous mixture heterogeneous mixture

  4. Determine whether each of the following properties is physical or chemical.

    • (a) A block of styrofoam floats on water.
      physical property chemical property

    • (b) Sugar becomes caramel when heated above its melting point.
      physical property chemical property

    • (c) Iron dissolves in hydrochloric acid and hydrogen gas evolves.
      physical property chemical property

    • (d) Lithium metal has a shiny surface. After exposure to air, it becomes dull.
      physical property chemical property

    • (e) An iron nail is attracted to a magnet.
      physical property chemical property

  5. Determine whether each of the following is either a chemical change or a physical change.

    • (a) pure water from seawater
      physical change chemical change

    • (b)Electricity is passed through water to produce hydrogen and oxygen gases.
      physical change chemical change

    • (c) A white T-shirt is dyed red.
      physical change chemical change

    • (d) A wet mop dries in the sun.
      physical change chemical change

    • (e) Making ice cube in the freezer.
      physical change chemical change

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