Lesson 11-15

Question 1

Electrolytic Cells

Answer 1

Reduction occurs at the cathode
Oxidation occurs at the anode

Question 2

At the cathode, water is reduced to

Answer 2

The electrolysis of water produces hydrogen and oxygen gases

Question 3

If the blood becomes acidic,

Answer 3

buffer solutions increase the pH value of blood

Question 4

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

Answer 4

The system reaches equilibrium faster

Question 5

Kc of H2 + I2 = 2Hl

Answer 5

2.0

Question 6

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

Answer 6

1.55

Question 7

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

Answer 7

Au3+ , Ni

Question 8

E = -0.257V
E = +1.498V

Answer 8

+1.755V

Question 9

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

Answer 9

H = -3.8 kJ

Question 10

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

Answer 10

S = + 6.72 J/mol

Question 11

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

Answer 11

G = -5.51 kJ

Question 12

500°C N2(g) + 3H2(g) <-> 2NH3(g)

Answer 12

Shift to left

Question 13

ion-product constant of water

Answer 13

Kw = [H3O+][OH-]

Question 14

Kw value of water with oh 7.30

Answer 14

2512 x 10^-15

Question 15

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

Answer 15

False

Question 16

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

Answer 16

2.0 x 10^-3

Question 17

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

Answer 17

5.4 x 10^-8

Question 18

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

Answer 18

7.3

Question 19

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

Answer 19

2.45

Question 20

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

Answer 20

SO42- + H3O+ = HSO4- + H2O

Question 21

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?

Answer 21

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

Question 22

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

Answer 22

The solution is slightly acidic.

Question 23

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

Answer 23

8.51 x 10^-8

Question 24

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?

Answer 24

An equilibrium mixture was formed.

Question 25

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

Answer 25

1.03 x 10^3

Question 26

Not included

Answer 26

The resulting solution is heated

Question 27

What will increase the equilibrium concentration

Answer 27

Increasing the pressure

Question 28

Temperature increased

Answer 28

Equilibrium shifts towards the product and equilibrium constant increases

Question 29

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

Answer 29

Greater yield

Question 30

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

Answer 30

False

Question 31

Conjugate base of HSO4-

Answer 31

SO42-

Question 32

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

Answer 32

CH3COOC2H5/(CH3COOH)(C2H5OH)

Question 33

2NO + O2 = 2NO

Answer 33

644000

Question 34

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

Answer 34

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

Question 35

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

Answer 35

0.868 M

Question 36

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.

Answer 36

II and IV

Question 37

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

Answer 37

Weak acid and their conjugate base

Question 38

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

Answer 38

I, II, and IV

Question 39

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

Answer 39

S universe

Question 40

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

Answer 40

Nitric Acid