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CK-12 Foundation
Ck 12: Polarity in Chemical Bonds
[Free Registration/Login may be required to access all resource tools.] Students will determine the polarity of a chemical bond using the electronegativity chart, and then distinguish between nonpolar covalent, polar covalent, and ionic...
Khan Academy
Khan Academy: Biology: Chemistry of Life: Chemical Bonds
Review over covalent, hydrogen, and ionic bonding in this article. Learn how molecules are held together by chemical bonds.