BIO152H5 Chapter Notes - Chapter 2: Covalent Bond, Chemical Polarity, Hydrogen Bond

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Chapter 2- water and carbon: the chemical basis of life. Chemical evolution: early in earth"s history, simple chemical compounds in the atmosphere and ocean combined to form larger more complex substances. H, c, n, o make up 96 percent of all matter found in organisms today. Isotopes: forms of an element with different numbers of neutrons. Orbital: electrons move around nuclei in specific regions. Valence: number of unpaired electrons in an atom. Atom is most stable when valence shell is filled. Some atoms hold electrons in covalent bonds much more tightly than do other atoms electronegativity. Mass of one mole of any molecule is the same as its molecular weight expressed in grams. Molecular weight is the sum of the mass numbers of all elements in a molecule. Molarity is the number of moles of the substance present per litre of solution. Water is polar meaning the overall distribution of charge is asymmetrical.

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