NEW
Font size
S
M
L
XL
WorksheetsSalad Quiz 8
Total questions: 9
Worksheet time: 37mins
Name
Class
Date
1.
The half-equation for the reaction occurring at the (+) electrode in a hydrogen-oxygen fuel which has an alkaline electrolyte would be
a)
H2(g) + 2OH-(aq)→ 2H2O(l) + 2e-
b)
H2(g) → 2H+(g) + 2e-
c)
O2(g) + 4H+(aq) + 4e- → 2H2O(l)
d)
O2(g) + 2H2O(l) + 4e- → 4OH- (aq)
2.
A simplified diagram of the phosphoric acid fuel cell (PAFC), and their half-reactions are shown. The cell operates at 190oC using an electrolyte of liquid phosphoric acid.
During operation of the PAFC, electrode I is
During operation of the PAFC, electrode I is
a)
positively charged, and the pH near the electrode will increase
b)
positively charged, and the pH near the electrode will decrease
c)
negatively charged, and the pH near the electrode will increase
d)
negatively charged, and the pH near the electrode will decrease
3.
A simplified diagram of the phosphoric acid fuel cell (PAFC), and their half-reactions are shown. The cell operates at 190oC using an electrolyte of liquid phosphoric acid.
Consider the following statements in regards to the PAFC:
I. The electrodes are likely to be porous and have a catalytic function.
II. More electrical energy will be produced in the PAFC for an equivalent mass of hydrogen, than using the fuel to produce steam for the generation of electricity by a turbine and generator.
III. The water generated in the cell reaction will dilute the electrolyte progressively and lower the efficiency of the cell.
Which of the above statements about PAFC are correct?
Consider the following statements in regards to the PAFC:
I. The electrodes are likely to be porous and have a catalytic function.
II. More electrical energy will be produced in the PAFC for an equivalent mass of hydrogen, than using the fuel to produce steam for the generation of electricity by a turbine and generator.
III. The water generated in the cell reaction will dilute the electrolyte progressively and lower the efficiency of the cell.
Which of the above statements about PAFC are correct?
a)
I and II only
b)
I and III only
c)
II and III only
d)
I, II and III
4.
Methane gas is used as a fuel in an acidic fuel cell. The half-equation occurring at the anode will be
a)
O2(g) + 4H+(aq) + 4e- →2H2O(g)
b)
CH4(g) + 2H2O(g) → CO2(g) + 8H+ (aq) + 8e-
c)
CH4(g) + 4H+(g)→ CO2(g) + 4H2O(l)
d)
CO2(g) + 8H+(aq) + 8e- → CH4(g) + 2H2O(g)
5.
The energy released in a chemical reaction is directly converted to electrical energy in al
a)
solar cell
b)
electrolytic cell
c)
fossil-fuel power station
d)
hydrogen/oxygen fuel cell
6.
A fuel cell can be constructed that uses the two half-reactions as shown.
Which one of the following would occur at the negative electrode of the cell as it generates electricity?
Which one of the following would occur at the negative electrode of the cell as it generates electricity?
a)
production of H+
b)
formation of H2O
c)
consumption of CO2
d)
reduction of CH3OH
7.
The net cell reaction in a particular galvanic cell is:
Cu2+(aq) + Sn2+(aq) → Cu(s) + Sn4+(aq)
In this cell, we would expect to observe:
Cu2+(aq) + Sn2+(aq) → Cu(s) + Sn4+(aq)
In this cell, we would expect to observe:
a)
crystals of copper forming on the anode.
b)
the cathode corroding away.
c)
the solution in the copper half-cell becoming lighter in colour.
d)
the voltmeter needle showing that the copper electrode has negative polarity.
8.
A galvanic cell was set up from a Cl2/Cl- half-cell and a standard hydrogen electrode (SHE). It was found that the voltmeter reading was 1.36 V and the chlorine half-cell was the positively-charged electrode. Which statement about this galvanic cell is INCORRECT?
a)
Both of the electrodes should be made of platinum.
b)
The chlorine half-cell is the anode.
c)
As the cell operates, the pH of the solution in the SHE decreases.
d)
The standard redox potential for the chlorine half-cell must be +1.36 V.
9.
A calorimeter is calibrated chemically by measuring the temperature change caused by the combustion of precisely 1.131 g of benzoic acid. The enthalpy of combustion of benzoic acid is given by the thermochemical equation below:
2C6H5COOH(s)+15O2(g)→14CO2(g)+6H2O(l); ΔH=-6454 kJ/mol
If the temperature increases by 30.94°C, the calibration factor of the calorimeter (in J/°C) is
2C6H5COOH(s)+15O2(g)→14CO2(g)+6H2O(l); ΔH=-6454 kJ/mol
If the temperature increases by 30.94°C, the calibration factor of the calorimeter (in J/°C) is
a)
208.5
b)
966.9
c)
1934
d)
3868
Reset
