Videos A to Z

  • Blood and Circulation: Blood in veins

    • 3-5

    Blood in veins contains less oxygen than blood in arteries. It also contains waste gases, such as carbon dioxide.  » more info

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  • Blood and Circulation: Blood on finger

    • 3-5

    The liquid part of blood is called plasma, which is made up of water and important substances, including vitamins, minerals, and nutrients.  » more info

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  • Bonding: Aluminum atom

    • 3-5
    • 6-8
    • 9-12

    Depicts millions of aluminum atoms. An atom is the smallest part of an element that still has all the properties of that element.  » more info

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  • Bonding: Atomic makeup of lead and gold

    • 3-5
    • 6-8
    • 9-12

    Lead and gold atoms differ from one another because they have different numbers of neutrons, protons, and electrons.  » more info

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  • Bonding: Atoms in pencil

    • 3-5
    • 6-8
    • 9-12

    Atoms are the building blocks of matter.  » more info

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  • Bonding: Bonding of hydrogen atoms

    • 3-5
    • 6-8
    • 9-12

    Two hydrogen atoms form a simple covalent bond. Each atom has a single electron. When the atoms bond, they share electrons and fill their outermost energy level.  » more info

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  • Bonding: Carbon atom

    • 3-5
    • 6-8
    • 9-12

    A carbon atom has 6 protons, 6 neutrons, and 6 electrons.  » more info

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  • Bonding: Chemical bonding

    • 3-5
    • 6-8
    • 9-12

    Atoms bond in ways that make their outermost energy levels complete with electrons, which stabilizes atoms.  » more info

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  • Bonding: Chemical compound

    • 3-5
    • 6-8
    • 9-12

    A chemical compound is made up of two or more elements that are chemically combined or bonded. The combining of atoms to form new substances is called chemical bonding.  » more info

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  • Bonding: Covalent bond video clip

    • 3-5
    • 6-8
    • 9-12

    In covalent bonds, electrons are shared between two different atoms. Atoms are held together by the force of attraction between the positively charged nucleus and the shared electrons.  » more info

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