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c2. chemistry of life > hydrogen bonding and water > Flashcards

hydrogen bonding and water Flashcards

1
Q

water has unique properties

A

molecule has no overall charge

oxygen atom carries slight negative charge

hydrogen atoms carry slight positive charges

polarity attracts them to one another

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2
Q

what has no overall charge?

A

molecules

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3
Q

what atom carries slight negative charge?

A

oxygen

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4
Q

what atoms carry slight positive charges?

A

hydrogen

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5
Q

what attracts them to one another?

A

polarity

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6
Q

what is a hydrogen bond?

A

an attraction between a covalently bonded hydrogen atom and another atom taking part in a separate polar covalent bond

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7
Q

is a hydrogen bond a chemical bond?

A

not a chemical bond

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8
Q

what does a hydrogen bond form?

A

a hydrogen bond forms and breaks more easily than covalent or ionic bonds

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9
Q

is a hydrogen bond weak or strong?

A

a hydrogen bond is collectively quite strong

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10
Q

what gives liquid water special properties?

A

extensive hydrogen bonding

makes life possible

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11
Q

water is an excellent solvent that allows other substances to do what?

A

dissolve in it (water)

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12
Q

what are the 2 special properties of water?

A

hydrophilic and hydrophobic

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13
Q

hydrophilic

A

water-loving

hydrophilic substances dissolve easily in water

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14
Q

what’s a solution?

A

a uniform mixture

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15
Q

what’s an example of a solution?

A

salt dissolved in water

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16
Q

what may vary in a solution?

A

proportions of substances

17
Q

hydrophobic

A

water-dreading

18
Q

do hydrophobic substances interact with water?

A

no, hydrophobic substances do not interact with water

19
Q

what’s an example of something hydrophobic?

A

oils

20
Q

what is concentration?

A

the amount of solute dissolved in a given fluid amount

21
Q

what is cohesion?

A

hydrogen bonds collectively exert a continuous pull on individual water molecules

22
Q

cohesion plays a role in what?

A

surface tension

23
Q

what is evaporation?

A

water molecules escape from liquid water surface as vapor

24
Q

what is evaporation resisted by?

A

hydrogen bonding

25
Q

cohesion of water molecules provides what that enables an insect to be able to walk on water?

A

surface tension

26
Q

what is temperature?

A

the measure of the energy of motion of atoms & molecules

27
Q

what stabilizes temperature?

A

water

28
Q

what keeps water molecules from moving as much as they would?

A

hydrogen bonding

29
Q

what is the important part of homeostasis?

A

temperature stability

30
Q

what is temperature stability?

A

molecules of life function within certain range of temperature

31
Q

what molecules pack less densely on ice than they do in water; reason why ice floats on water?

A

individual water molecules

c2. chemistry of life (24 decks)

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