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Question
Identify the anode and cathode, and indicate the direction of ion flow to and from each electrode.A) Fe is the anode and Sn is the cathode; Fe2+ ions flow to the anode and Sn2+ ions flow from the cathode.
B) Fe is the anode and Sn is the cathode; Sn2+ ions flow to the cathode and Fe2+ ions flow from the anode.
C) Sn is the anode and Al is the cathode; Fe2+ ions flow to the cathode and Sn2+ ions flow from the anode.
D) Sn is the anode and Al is the cathode; Sn2+ ions flow to the anode and Fe2+ ions flow from the cathode.
Answer
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Related questions
Q:
In the following picture of an oxide, darkly-shaded spheres represent oxygen atoms or ions and lightly-shaded spheres represent atoms or ions of a third-row element in its highest oxidation state. Tell whether the oxide is covalent or ionic and whether the oxide is acidic or basic. A) covalent and acidic
B) covalent and basic
C) ionic and acidic
D) ionic and basic
Q:
Picture (a) shows p-orbital overlap between carbon and oxygen atoms; picture (b) shows p-orbital overlap between silicon and oxygen atoms. Based on these pictures, it is expected that
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B) silicon and oxygen form better σ bonds than carbon and oxygen, so Si-O single bonds are stronger than C-O single bonds.
C) carbon and oxygen form better π bonds than silicon and oxygen, so C=O double bonds are stronger than Si=O double bonds.
D) silicon and oxygen form better π bonds than carbon and oxygen, so Si=O double bonds are stronger than C=O double bonds.
Q:
Which element shown on the periodic table above forms an interstitial binary hydride with the formula MXx?
A) element A
B) element B
C) element C
D) element D
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B) element B
C) element C
D) element D
Q:
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Q:
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Q:
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Q:
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B) H2SO4
C) CoCl2 6 H2O
D) Cu(OH)2
Q:
Indicate the coefficient in front of H2O2 when the following redox equation is balanced in an acidic medium.H2O2(aq) + MnO4-(aq) -> O2(g) + Mn2+(aq)A) 2B) 3C) 5D) 7
Q:
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A) H2O
B) H2O2
C) O2
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Q:
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Q:
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A) an oxide.
B) a peroxide.
C) a superoxide.
D) an oxide and a superoxide.
Q:
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B) Na2O
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Q:
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A) Si
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Q:
Which element most readily forms nonstoichiometric hydrides?
A) Pd
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Q:
Which transition metal hydride is commonly used in the purification of hydrogen gas?
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Q:
Covalent hydrides of the type MH3 are likely to form with elements of what group?
A) 3A
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C) 5A
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Q:
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Q:
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Q:
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Q:
The bright colors of anodized titanium are due toA) electrodeposition of organic dyes on the titanium surface.B) the formation of a titanium alloy with chromium and copper.C) iridescence involving the semitransparent outer layer of TiO2.D) trapping of organic dye molecules in a spongy TiO2 matrix.
Q:
Chromium can be electroplated from an aqueous solution containing sulfuric acid and chromic acid, H2CrO4. What current is required to deposit chromium at a rate of 1.25 g/min?
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B) 38.7 A
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D) 232 A
Q:
How many grams of chromium metal are plated out when a constant current of 8.00 A is passed through an aqueous solution containing Cr3+ ions for 40.0 minutes?
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Q:
The electrolysis of an aqueous solution of NS produces oxygen at the anode according to the following equation:Calculate the volume of at STP that is produced by the passage of 3.00 A through this solution for 150 minutes.A) 1.57 LB) 0.0261 LC) 6.28 LD) 0.0700 L
Q:
O2(g) + 4 H+(aq) + 4 e--> 2 H2O(l) E = +1.23 VI2(s) + 2 e- -> 2 I-(aq) E = +0.54 V2 H2O(l) + 2 e- -> H2(g) + 2 OH-(aq) E = -0.83 VMg2+(aq) + 2 e- -> Mg(s) E = -2.37 VBased on the data above, electrolysis of an aqueous solution of MgI2, with inert electrodes, is expected to produceA) Mg at the cathode and I2 at the anode.B) H2 at the cathode and I2 at the anode.C) Mg at the cathode and O2 at the anode.D) H2 at the cathode and O2 at the anode.
Q:
A steel pipe can be protected from corrosion by attaching the pipe to a piece of magnesium because
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B) magnesium is more easily oxidized than iron.
C) magnesium is inert.
D) magnesium and steel form a corrosion resistant alloy.
Q:
Which of the following statements concerning the rusting of iron is false?
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B) The metal is reduced.
C) The rusting of iron requires both oxygen and water.
D) Salt increases the rate of corrosion by providing ions to carry the current.
Q:
Shown below are the reactions occurring in the direct methanol fuel cell (DMFC).I 2 CH3OH(aq) + 2 H2O(l) -> 2 CO2(g) +12 H+(aq) +12 e-II 3 O2(g) + 12 H+(aq) + 12 e- -> 6 H2O(l)Overall 2 CH3OH(aq) + 3 O2(g) -> 2 CO2(g) + 4 H2O(l)Which is the anode reaction, and what is being oxidized in the overall reaction?A) I, CH3OHB) I, H2OC) II, O2D) II, H+