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Biochemistry I > Water - TRQ > Flashcards

Water - TRQ Flashcards

1
Q

Aggregates of amphipathic molecules in water are called…

A

micelles

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2
Q

Buffers are mixtures of…

A

Weak acids and their conjugate bases

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3
Q

Entropy increases as substances…

A

Dissolve in water

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4
Q

HendersonHasselbach equation is…

A

pH = pKa + log (A-/HA)

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5
Q

Hydrophilic means…

A

Water-loving

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6
Q

Hydrophobic means…

A

Water-hating

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7
Q

Kw = 1 x 10^-14 M^2 at…

A

25ºC

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8
Q

Small changes in pH produces _____ changes in the rate of a process.

A

Large

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9
Q

As crystalline substances dissolve in water…

A

Entropy increases

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10
Q

At 25ºC, Kw always equals…

A

1 x 10^-14 M^2

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11
Q

Compounds that dissolve easily in water are ___ and ___.

A

Hydrophilic; polar

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12
Q

Compounds that do NOT dissolve easily in water are ___ and ___.

A

hydrophobic; nonpolar

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13
Q

Compounds that contain regions that are polar AND regions that are nonpolar are called…

A

Amphipathic

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14
Q

For all weak acids, when [HA] = [A-]…

A

pH = pKa

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15
Q

If two solutions differ in pH by 1 pH unit, that means that one solution has ____ than the other.

A

10 times the [H+]

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16
Q

If two solutions differ in pH by 2 pH unit, that means that one solution has ____ than the other.

A

100 times the [H+]

17
Q

In the formation of a micelle, what regions are found on the exterior surface?

A

polar

18
Q

In the formation of a micelle, what regions are sequestered in the interior?

A

nonpolar

19
Q

Reactions in which the elements of water are added are called…

A

Hydrolysis

20
Q

Reactions in which the elements of water are eliminated are called…

A

Condensation

21
Q

The buffering region of an aqueous system occur…

A

Between pKa +/- 1

22
Q

The ion product of water, Kw is equal to…

A

[H+][OH-]

23
Q

The most stable structure of a macromolecule contains…

A

Maximized weak interactions

24
Q

The most stable structure of a macromolecule is the…

A

Native structure

25
Q

The stronger the tendency to dissociate a proton, the…

A

Stronger the acid

26
Q

The stronger the tendency to dissociate a proton, the…

A

Lower the pKa

27
Q

The sum of all the hydrogen bonds between H2O molecules allows liquid water to confer great internal…

A

Cohesion

28
Q

The electronegative atoms that participate in hydrogen bonding include…

A

O, F, N

29
Q

The normal pH of blood is…

A

7.4

30
Q

The symbol p denotes…

A

-log

31
Q

The type of forces that hold nonpolar regions of molecules together are called…

A

Hydrophobic interactions

32
Q

Weak intermolecular forces between molecules as a result of inducing polarizing on one another are called…

A

Van der Waals interactions

33
Q

What is the electron geometry of a water molecule?

A

Tetrahedral

34
Q

What is the molecular geometry of a water molecule?

A

Bent

35
Q

What type of solvent is water?

A

Polar

36
Q

When the rate of the forward reaction equals the rate of the reverse reaction, the reaction is in…

A

Equilibrium

Biochemistry I (7 decks)

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