BIO_SC 1010 Lecture Notes - Lecture 5: Sodium Chloride, Electronegativity, Surface Tension

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14 Sep 2016
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Chemistry and Water 8-31-16
Chemical Bonds
Atoms held close together by attractions
3 Main Types:
Ionic
Covalent
Hydrogen
Ion: When an atom gains or loses an electron, it becomes charged (either + or -)
Ionic Bond: When two ions of opposite charges are close to each other, attractions
form between opposite charges
Ex. Sodium Chloride (NaCl)
Na -- needs to lose one electron to have a full outermost shell
Cl -- needs to gain one electron to have a full outermost shell
One electron moves between the two
Na has + charge, Cl has - charge
Covalent Bonds
two atoms share one or more pairs of electrons to fill their outermost shell
Carbon can have 4 types of covalent bonds
Organic: C-H bond anywhere in molecule
Inorganic: No C-H bond in molecule
Electronegativity: strength of a pull that an atom has on these electrons
If two atoms have different electronegativities the atoms share the elections
unequally; electrons will spend time closer to the MORE electronegative
atom
C-H-N-O chain
Hydrogen Bonds
weak bonds formed between an H with slight positive charge, and another
molecule's atom with a slight negative charge
Between water molecules: the slight negative charge of O is attracted to the
slight positive charge of another water molecule's H
Water
all organisms require water more than anything else
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Document Summary

Ion: when an atom gains or loses an electron, it becomes charged (either + or -) Ionic bond: when two ions of opposite charges are close to each other, attractions form between opposite charges. Na -- needs to lose one electron to have a full outermost shell. Cl -- needs to gain one electron to have a full outermost shell. Na has + charge, cl has - charge. Covalent bonds two atoms share one or more pairs of electrons to fill their outermost shell. Carbon can have 4 types of covalent bonds. Electronegativity: strength of a pull that an atom has on these electrons. If two atoms have different electronegativities the atoms share the elections unequally; electrons will spend time closer to the more electronegative atom. Hydrogen bonds weak bonds formed between an h with slight positive charge, and another molecule"s atom with a slight negative charge.

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