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Gen Chem > Lesson 11-15 > Flashcards

Lesson 11-15 Flashcards

1
Q

Electrolytic Cells

A

Reduction occurs at the cathode
Oxidation occurs at the anode

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2
Q

At the cathode, water is reduced to

A

The electrolysis of water produces hydrogen and oxygen gases

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3
Q

If the blood becomes acidic,

A

buffer solutions increase the pH value of blood

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4
Q

What effect will likely occur when a catalyst is added on a reaction

A

The system reaches equilibrium faster

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5
Q

Kc of H2 + I2 = 2Hl

A

2.0

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6
Q

Kc is 49 of H2 + I2 = 2HI
HI =

A

1.55

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7
Q

Cathode and Anode of
Ni(s) -> Ni2+(aq) + 2e-
Au3+(aq) + 3e- -> Au(s)

A

Au3+ , Ni

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8
Q

E = -0.257V
E = +1.498V

A

+1.755V

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9
Q

H of 2C(s diamond) -> 2C(s graphite)

A

H = -3.8 kJ

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10
Q

S of 2C(s diamond) -> 2C(s graphite)

A

S = + 6.72 J/mol

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11
Q

G of 2C(s diamond) -> 2C(s graphite)

A

G = -5.51 kJ

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12
Q

500°C N2(g) + 3H2(g) <-> 2NH3(g)

A

Shift to left

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13
Q

ion-product constant of water

A

Kw = [H3O+][OH-]

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14
Q

Kw value of water with oh 7.30

A

2512 x 10^-15

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15
Q

True or False
At point A on the tine axis, the concentration of all three gases is zero

A

False

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16
Q

The pOH of a solution of NaOH is 11.30. What is the [H+] for this solution?

A

2.0 x 10^-3

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17
Q

The value of Kw at 10° C is 2.95 x 10^-15
What is the [H3O+] at this temperature?

A

5.4 x 10^-8

18
Q

The value of Kw at 10° C is 2.95 x 10^-15
pOH of water

A

7.3

19
Q

pH = 4.87 ; Ka = 3.30 x 10^-5)
A/HA = ?

A

2.45

20
Q

Which of the following chemical systems at equilibrium involves water acting a Bronsted-Lowry acid?

A

SO42- + H3O+ = HSO4- + H2O

21
Q

The E° value of Ni2+/Ni is -0.25V and Ag+/Ag is +0.80V. If a cell is made by taking the two electrodes, what is the feasibility of the reaction?

A

Since E° value for the cell will be positive, redox reaction is feasible.

22
Q

The concentration of H3O+ in a patient’s blood sample is 11.65 x 10-8 M. Is the blood acidic, basic, or neutral?

A

The solution is slightly acidic.

23
Q

H3O+ 11.65 x 10 x 10^-8
OH-

A

8.51 x 10^-8

24
Q

A few drops of concentrated sulphuric acid were added to a mixture of of methanol and 0.2 mol of ethanoic acid. Even after a considerable tir reaction mixture was found to contain some of each reactant. Which of following is the BEST explanation for the incomplete reaction?

A

An equilibrium mixture was formed.

25
Q

4NH3(g) + 5O2(g) = 4NO(g) + 6H2O(g)

A

1.03 x 10^3

26
Q

Not included

A

The resulting solution is heated

27
Q

What will increase the equilibrium concentration

A

Increasing the pressure

28
Q

Temperature increased

A

Equilibrium shifts towards the product and equilibrium constant increases

29
Q

What will happen if pressure is increased on the yield of ammonia

A

Greater yield

30
Q

True or False
The Gibbs free energy change is the proportion of the enthalpy change of a reaction that is used to increase the entropy

A

False

31
Q

Conjugate base of HSO4-

A

SO42-

32
Q

CH3COOH(aq) + C2H5OH(aq) = CH3COOC2H5(aq) + H2O(l)

A

CH3COOC2H5/(CH3COOH)(C2H5OH)

33
Q

2NO + O2 = 2NO

A

644000

34
Q

Ni(s) + 4CO(g) = 4Ni(CO)4(g)

A

[Ni(CO)4]^4 / CO^4

35
Q

2SO3(g) =2SO2(g) + O2

A

0.868 M

36
Q

I. donates electrons when reacting with an acid.
II. donates its protons when reacting with a base.
III. accepts electrons when reacting with a base.
IV. accepts protons when reacting with an acid.

A

II and IV

37
Q

The nature of buffers is to maintain the pH of the solution relatively stable.

A

Weak acid and their conjugate base

38
Q

I.Coat your battery terminals with dielectric grease or battery terminal protector.
II.Make sure the battery is stored in a moderate temperature environment.
III.Undercharging or overcharging can extend the life span of the battery.
IV.Check for leaking fluids

A

I, II, and IV

39
Q

Which of the following is ALWAYS positive when a spontaneous process occurs?

A

S universe

40
Q

In which of the following compound does nitrogen have the most positive oxidation state?

A

Nitric Acid

Gen Chem (4 decks)

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