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  • Video 
    Percent Composition of Compounds (Screencast)

    Percent Composition of Compounds (Screencast)

    Learners examine the method used to calculate the mass percent of an element in a compound. Three examples and one problem illustrate the method.

    Subjects:
    Chemistry
    Keywords:
    Chemistry -- Notation Chemical elements
    Resource Type:
    Video
     
  • Others 
    Atomic Weight

    Atomic Weight

    Learners read the definition of atomic weight and obtain the weights of elements by viewing the Periodic Table and charts that list atomic weights by name or symbol.

    Subjects:
    Chemistry
    Keywords:
    Periodic table of the elements Chemical elements Atomic weights
    Resource Type:
    Others
     
  • Video 
    Product Yields in Chemical Reactions (Screencast)

    Product Yields in Chemical Reactions (Screencast)

    Learners examine the meaning of theoretical yield, actual yield, and percent yield. They test their knowledge by solving two problems.

    Subjects:
    Chemistry
    Keywords:
    Chemical reactions
    Resource Type:
    Video
     
  • Others 
    Absolute Zero Temperature

    Absolute Zero Temperature

    Learners view illustrations showing the direct dependence of the volume of a gas on temperature and consider the relationship between the Kelvin and Celsius temperature scales.

    Subjects:
    Chemistry
    Keywords:
    Temperature Low temperatures
    Resource Type:
    Others
     
  • Others 
    Melting Point and Freezing Point

    Melting Point and Freezing Point

    Learners observe that the melting of a solid and the freezing of its liquid occur at the same temperature. The melting point is an intrinsic property and is used to identify a substance.

    Subjects:
    Chemistry
    Keywords:
    Melting points Freezing points
    Resource Type:
    Others
     
  • Others 
    Oxidation Numbers

    Oxidation Numbers

    Learners assign oxidation numbers to atoms in neutral compounds and in polyatomic ions. Six examples are worked through in detail, and three problems are provided.

    Subjects:
    Chemistry
    Keywords:
    Reduction (Chemistry) Chemical reactions Oxidation Oxidation-reduction reaction
    Resource Type:
    Others
     
  • Video 
    Electromagnetic Radiation (Screencast)

    Electromagnetic Radiation (Screencast)

    In this animated and interactive object, learners examine the inverse proportionality of wavelength and frequency and their relationship to the speed of light.

    Subjects:
    Chemistry
    Keywords:
    Electromagnetic waves
    Resource Type:
    Video
     
  • Others 
    The Solid State

    The Solid State

    In this well-illustrated object, learners examine the structures and properties of the four types of solids: molecular, metallic, ionic, and covalent network. Five interactive questions are provided.

    Subjects:
    Chemistry
    Keywords:
    Solid state chemistry
    Resource Type:
    Others
     
  • Others 
    Ions

    Ions

    Ions are electrically charged particles obtained from an atom or from a chemically bonded group of atoms by adding or removing electrons. Eight examples illustrate the number of protons, neutrons, and electrons in positive ions (cations) and in negative ions (anions).

    Subjects:
    Chemistry
    Keywords:
    Ions
    Resource Type:
    Others
     
  • Others 
    Determining Empirical and Molecular Formulas (Screencast)

    Determining Empirical and Molecular Formulas (Screencast)

    Learners follow a four-step process to determine the empirical formula of a compound from the masses of its constituent elements. The molecular formula is determined in a fifth step using the molecular weight of the compound.

    Subjects:
    Chemistry
    Keywords:
    Molecular weights Chemistry Physical theoretical
    Resource Type:
    Others