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General Chemistry II-Lecture,Section-1-Spring 2025
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A concentration cell is constructed using two Ni electrodes with Ni2+ concentrations of 1.70 M and 4.40 ´ 10-4 M in the two half-cells. The reduction potential of Ni2+ is -0.23 V. Calculate the potential of the cell at 25°C.
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In a common car battery, six identical cells each carry out the following reaction: Pb + PbO2 + 2HSO4- + 2H+ ® 2PbSO4 + 2H2OSuppose that to start a car on a cold morning, 126 amperes is drawn for 13.0 seconds from such a cell. How many grams of Pb are consumed? (The atomic mass of Pb is 207.19 g/mol.)
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If an electrolysis plant operates its electrolytic cells at a total current of 1.0 ´ 106 amp, how long will it take to produce one metric ton (one million grams) of Mg(s) from seawater containing Mg2+? (1 faraday = 96,485 coulombs)
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A solution of MnO42- is electrolytically reduced to Mn3+. A current of 8.14 amp is passed through the solution for 12.4 minutes. How many moles of Mn3+ produced in this process? (1 faraday = 96,485 coulombs)
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Copper is electroplated from an aqueous CuSO4 solution. A constant current of 5.42 amp is applied by an external power supply. How long will it take to deposit 4.06 ´ 102 g of Cu? The atomic mass of copper is 63.546 g/mol.
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Electrolysis of a molten salt with the formula MCl, using a current of 3.86 amp for 16.2 min, deposits 1.52 g of metal. Identify the metal. (1 faraday = 96,485 coulombs)
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Pi bonding tends to be important in all elements of Group 5.
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Nitrogen fixation
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Ionic hydrides are formed when hydrogen combines with elements from
| I. | Group 1A |
| II. | Group 2A |
| III. | Group 3A |
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Choose the correct molecular structure for SiF4
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