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| 1 | |
Which is not a redox reaction? |
| | A) | CH4(g) + 2 O2(g) →CO2(g) + 2 H2O (l) |
| | B) | 4 Al4(s) + 3 O2(g) → 6 H2O(l) + 4 Al(OH)3(s) |
| | C) | Zn(s) + 2 MnO2(s) + H2O (l) → Zn(OH)2(s) + Mn2O3(s) |
| | D) | HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) |
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| 2 | |
As the lithium-iodide cell, Li + 1/2 I2 → LiI, discharges, lithium is oxidized and iodine is reduced. Which is the correct oxidation half-reaction? |
| | A) | Li + e– → Li+ |
| | B) | Li+ → Li + e– |
| | C) | Li → Li+ + e– |
| | D) | Li+ + e– → Li |
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| 3 | |
H2O2 can decompose into O2 and water. In this reaction |
| | A) | hydrogen is reduced and oxygen is oxidized. |
| | B) | hydrogen is oxidized and oxygen is reduced. |
| | C) | hydrogen is both oxidized and reduced. |
| | D) | oxygen is both oxidized and reduced. |
| | E) | no species is oxidized or reduced. |
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| 4 | |
This is a schematic of a typical dry cell. What is the reduction half-reaction in this cell?
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| | A) | Zn(s) + 2 OH– → Zn(OH)2(s) + 2 e– |
| | B) | Zn(s) + 2 MnO2(s) + 2 e– → Mn2O3(s) + 2 OH–(aq) |
| | C) | Zn(s) + H2O(l) + 2 MnO2(s) → Mn2O3(s) + Zn(OH)2(s) |
| | D) | 2 MnO2(s) + H2O(l) 2 e– → Mn2O3(s) + 2 OH–(aq) |
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| 5 | |
In an electrochemical cell, electrons flow |
| | A) | from the cathode to the anode. |
| | B) | from the anode to the cathode. |
| | C) | through the salt bridge. |
| | D) | right to left. |
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| 6 | |
A device in which electrical energy is used to perform a chemical transformation is called |
| | A) | an electrochemical cell. |
| | B) | an electrolytic cell. |
| | C) | a hydroelectric cell. |
| | D) | a hydrogen cell. |
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| 7 | |
In what commercial application is this reaction used?
PbO2(s) + Pb(s) + 2 H2SO4(aq) → 2 PbSO4(s) + 2 H2O (aq) |
| | A) | alkaline cells used in calculators |
| | B) | solar cells at remote power stations |
| | C) | storage battery in most automobiles |
| | D) | photovoltaic cells for direct conversion of sunlight |
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| 8 | |
Which type of battery or cell would likely be used in this portable drill?
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| | A) | a mercury oxide button battery |
| | B) | a lead storage battery |
| | C) | a nickel-cadmium battery |
| | D) | a hydrogen-oxygen fuel cell |
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| 9 | |
What condition must be met for a battery to be rechargeable? |
| | A) | Either the anode or the cathode must generate a gas as a result of the electrochemical reaction. |
| | B) | The battery must generate electricity using an acid-base reaction rather than using an oxidation-reduction reaction. |
| | C) | The battery must be open to the outside so that internal pressure will not build up. |
| | D) | The electrochemical reaction of the battery must be reversible. |
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| 10 | |
The term “hybrid” most commonly describes a car containing |
| | A) | two different types of batteries. |
| | B) | both a battery and a conventional gasoline-powered engine. |
| | C) | both a conventional gasoline-powered engine and an ethanol-powered engine. |
| | D) | a battery and a hydrogen-oxygen fuel cell. |
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| 11 | |
What does this Honda FCX car use to generate power?
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| | A) | lead-acid storage batteries |
| | B) | hydrogen fuel cells |
| | C) | photovoltaic cells |
| | D) | fission-based reactors |
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| 12 | |
A major advantage of a fuel cell over a lead-acid battery is that a fuel cell |
| | A) | will not run down like a battery as long as fuel and oxygen are supplied. |
| | B) | generates electricity without the need for an oxidation-reduction reaction. |
| | C) | is 100% efficient at generating electricity, but a battery is less than 1% efficient. |
| | D) | produces more fuel than it consumes. |
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| 13 | |
Which are applications of metal hydrides? |
| | A) | photovoltaic devices and hydrogen storage materials |
| | B) | hydrogen storage materials and electrodes for rechargeable batteries |
| | C) | electrodes for rechargeable batteries and photovoltaic devices |
| | D) | photovoltaic devices and reforming catalysts |
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| 14 | |
Compared to PEM fuel cell, solid oxide fuel cells (SOFCs) operate at a ________ temperature and are _____________ efficient. |
| | A) | lower, more |
| | B) | lower, less |
| | C) | higher, more |
| | D) | higher, less |
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| 15 | |
Which is NOT an advantage of using hydrogen as a fuel as compared to fossil fuels? |
| | A) | Combustion products are less harmful to the environment. |
| | B) | With current technology, H2 is a renewable resource. |
| | C) | Hydrogen has about 3 times the energy content per gram compared to the best fossil fuels. |
| | D) | Hydrogen gas has very few of the impurities responsible for the production of acid rain. |
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| 16 | |
Which is not a problem with moving towards a hydrogen-energy based economy? |
| | A) | finding raw materials containing hydrogen |
| | B) | separating hydrogen from raw materials |
| | C) | storing hydrogen safely |
| | D) | transporting hydrogen economically |
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| 17 | |
Hydrogen gas can be made by reacting steam with methane, producing H2 and CO2. Which statement about this process is true? |
| | A) | The reaction is exothermic and needs improved catalysts to increase the yield. |
| | B) | The reaction is endothermic and must be carried out at high temperatures. |
| | C) | The reaction must be carried out using the process of electrolysis, which requires energy. |
| | D) | The products are unstable often resulting in an explosion. |
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| 18 | |
Which statement about hydrogen is false ? |
| | A) | Hydrogen has a high energy density (kJ/g). |
| | B) | Virtually no hydrogen is present in the Earth's atmosphere because large quantities are consumed by the sun. |
| | C) | It takes a significant amount of energy to separate hydrogen from water. |
| | D) | There are abundant natural sources of hydrogen in forms other than H2(g). |
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| 19 | |
19. Which are advantages of using photovoltaic cells to convert sunlight directly into electricity over using more conventional methods?
I non-polluting in operation
II low maintenance during operation
III modular, so any size PV array can be constructed
IV large amount of space needed for a photovoltaic array
V quiet while in operation
VI high cost of producing the PV cells
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| | A) | I, II, IV, and V |
| | B) | I, II, III, and V |
| | C) | III, IV, and VI |
| | D) | III, IV, V, and VI |
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| 20 | |
What type of semi-conductor is shown in this diagram?
Note: The smaller filled circles represent electrons. The larger filled circles represent Si atoms. The patterned circle represents a doping atom.
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| | A) | a gallium-doped p-type silicon semi-conductor |
| | B) | a gallium-doped n-type silicon semi-conductor |
| | C) | an arsenic-doped p-type silicon semi-conductor |
| | D) | an arsenic-doped n-type silicon semi-conductor |
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