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CHEM 202 > True or False Exam 3 > Flashcards

True or False Exam 3 Flashcards

1
Q

A higher concentration of buffer components gives a better buffer capacity.

A

true

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2
Q

the H2PO4-/HPO4-2 bufer si common ni living systems.

A

true

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3
Q

for a buffer solution, when the conjugate ratio is one, then pH = pKa.

A

true

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4
Q

increasing the ratio of the conjugate pair (base/acid) wil decrease the pH of a buffer solution.

A

false

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5
Q

The addition of strong acid to a buffer solution increases the pH of the solution.

A

false

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6
Q

Dilution favors that side of an equation which has more gas or solute particles.

A

True

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7
Q

For every equilibrium system, decreasing the volume wil shift the equilibrium position to the right.

A

false

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8
Q

For an exothermic process, the equilibrium constant will increase at higher temperatures.

A

false

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9
Q

Adding more solid reactant to a system increases Q.

A

false

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10
Q

consider the following system at equilibrium.
BaSO,(5) + H(aq) = Ba?(aq) + HSO4(aq) ДН° = 48.2 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? DECREASE TEMPERATURE

A

left

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11
Q

Consider the following system at equilibrium.
BaSO,(5) + H(aq) = Ba?(aq) + HSO4(aq) ДН° = 48.2 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? ADD A SOULUBLE BARIUM SALT

A

left

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12
Q

Consider the following system at equilibrium.
BaSO,(5) + H(aq) = Ba?(aq) + HSO4(aq) ДН° = 48.2 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? INCREASE THE AMOUNT OF WATER SOLVENT

A

right

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13
Q

Consider the following system at equilibrium.
BaSO,(s) + H(aq) = Ba?(aq) + HSO4(aq) ДН° = 48.2 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? ADD MORE BaSO4(s)

A

no effect

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14
Q

Consider the following system at equilibrium.
PA(s) + 12 HC (g) ~ 4 PC|3(9) + 6H2(9)
AH° = -47.08 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? ADD MORE P4

A

no effect

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15
Q

Consider the following system at equilibrium.
PA(s) + 12 HC (g) ~ 4 PC|3(9) + 6H2(9)
AH° = -47.08 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? INCREASE H2 PRESSURE

A

left

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16
Q

Consider the following system at equilibrium.
PA(s) + 12 HC (g) ~ 4 PC|3(9) + 6H2(9)
AH° = -47.08 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? ADD NE(G) TO INCREASE THE TOTAL PRESSURE IN THE SYSTEM

A

no effect

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17
Q

Consider the following system at equilibrium.
PA(s) + 12 HC (g) ~ 4 PC|3(9) + 6H2(9)
AH° = -47.08 kJ
Wil the following actions favor a shift to the right side, to the left side, or have no such effect? DECREASE THE VOLUME OF THE SYSTEM

A

right

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18
Q

Hydrobromic acid is a strong acid.

A

true

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19
Q

Chloride has no significant pul on H+ of H30+.

A

true

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20
Q

Water can completely dissociate HF.

A

false

21
Q

in pure water, [OH-] = 1.0 × 10^-14 M.

A

false

22
Q

The protonation of a base gives a conjugate acid.

A

true

23
Q

Acetate has no significant pul on H+ of H3O+.

A

false

24
Q

Oxalic acid is a weak acid.

A

true

25
Q

in basic solution, pOH > pH.

A

false

26
Q

a solution of pH 3 is more acidic than a solution of pH 4.

A

true

27
Q

NO2^-is the conjugate base of nitric acid.

A

false

28
Q

When ammonia dissolves ni water, every molecule of ammonia becomes protonated.

A

false

29
Q

When ammonia dissolves ni water, every molecule of ammonia becomes protonated.

A

false

30
Q

As [OH] increases, pH increases.

A

true

31
Q

As pOH increases, [H+] decreases.

A

false

32
Q

H2PO4^- and HPO4^2- are a conjugate pair.

A

true

33
Q

Upon dissolving in water, hydrogen iodide wil protonate water.

A

true

34
Q

Water molecules can pull on each other and break an O-H bond (at least to some extent).

A

true

35
Q

Asolution of pH 6 is more basic than a solution of pOH 6.

A

false

36
Q

Water can protonate a base and it can deprotonate an acid.

A

true

37
Q

Bisulfate is the conjugate acid of sulfate.

A

true

38
Q

In a weak acid solution, dilution favors dissociation.

A

true

39
Q

perchloric acid is diprotic.

A

false

40
Q

Water can deprotonate bisulfate ion (at least to some extent).

A

true

41
Q

the Ka of H2PO4- is greater than the Ka of HPO4^2-

A

true

42
Q

HClO, is a stronger acid than HCI

A

false

43
Q

Amines are weak bases.

A

true

44
Q

Protonated amines are weak acids.

A

true

45
Q

Anions of weak, monoprotic acids are weak bases.

A

true

46
Q

Acetate ion is a better base than cyanide ion.

A

false

47
Q

Ammonia is a better base than phosphate ion.

A

false

48
Q

Metal cations of 3+ charge are acidic.

A

true

CHEM 202 (1 decks)

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