lecture 3 part 1 Flashcards

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1
Q

what does e- clouds show

A

where e- are likely to be

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2
Q

what do electrons determine

A

atoms ability to form bonds and thus form molecule

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3
Q

what do physical and chemical properties depend on

A

its atom and ho they are bonded together

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4
Q

electrons are responsible for ____ in molecule

A

PE

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5
Q

why do atoms make bonds with other atoms

A

to fill outer e- shell and make it much more stable

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6
Q

how are covalent bonds created

A

by sharing e- by atoms

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7
Q

are covalent bonds weak

A

no they are very strong. They are not broken by:
-inc in temp (up to 100C)
-changes in PH
-changes in salt concentration
-presence of detergents or non polar solvents

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8
Q

what do chemical reactions involve

A

breaking and forming of covalent bonds

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9
Q

in bio systems what is required for chem rxn to take place

A

enzymes

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10
Q

electronegativity

A

measure of atoms attraction for e- in a covalent bond

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11
Q

non polar covalent bond

A

e- shared equally

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12
Q

polar covalent bond

A

e- not shared equally

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13
Q

are fat moleqs polar or non polar

A

non polar-its tails are made of C + H atoms

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