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1-13-10IonicCovalentBondsPE

1-13-10IonicCovalentBondsPE - BIOL13100 Biology II...

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BIOL13100 Biology II: Development, Structure, and Function of Organisms January 13, 2010 Dr. Nancy Pelaez Lilly G-224 [email protected] CO 2 C 6 H 12 O 6 Glucose
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My… mother …is … ELECTRICITY
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An electrical field exists in the space surrounding the charges.
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Figure 2-1a Diagrams of atoms Hydrogen Carbon Nucleus Electron Proton Neutron + + +
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The atomic weight (or atomic mass) is the sum of the number of protons and neutrons in the nucleus. It is the mass, in grams, of one mole of the element. A mole is the Avogadro number (about 6 x 10 23 ) of atoms. The molecular weight of a compound is the sum of the atomic weights of all of the constituent atoms. The unit is the Dalton.
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Ionic Bonds Involve the complete transfer of an electron from one atom to another.
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Figure 2-6ab A sodium ion being formed A chloride ion being formed Loss of electron Cation formation Anion formation Gain of electron Sodium ion has positive charge Chloride ion has negative charge
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Figure 2-6 A sodium ion being formed A chloride ion being formed Table salt is a crystal composed of two ions . Cl Na + Loss of electron Cation formation Anion formation Gain of electron Sodium ion has positive charge Chloride ion has negative charge
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Figure 2-5 Nonpolar covalent bond in hydrogen molecule Polar covalent bonds in water molecule Electrons are shared equally Electrons are not shared equally, so partial charges exist on the O and H atoms
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1-13-10IonicCovalentBondsPE - BIOL13100 Biology II...

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