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Study Quiz 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)
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
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.
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)
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.
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.
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
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
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.
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.
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
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.
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
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
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.
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
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.
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).
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

A)I, II, IV, and V
B)I, II, III, and V
C)III, IV, and VI
D)III, IV, V, and VI
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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