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1 Copyright Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Guide for Content MasteryChemistry: Matter and Change Chapter 21121 ElectrochemistryElectrochemistrySection CellsIn your textbook, read about redox in each of the terms below just once to complete the and reduction reactions can occur in separate solutions, as long as there are twoconnections between the solutions. One connection is a(n) (1)through which ions can flow. The other connection is a metal wire through which electronscan flow.

2 The flow of ions or electrons is known as a(n) (2). Thecomplete setup, called a(n) (3), can convert chemical energy intoelectrical energy or electrical energy into chemical energy. These cells are also known as(4)cells or (5) the diagram of an electrochemical cell to answer the following equation at the bottom of each beaker shows the half-reaction that is occurring in that beaker. What kind of reaction(oxidation or reduction) is occurring in each beaker?Left beaker Right beaker the net ionic equation for this electrochemical which direction do electrons move through the wire?

3 Kind of ions (positive or negative) move from the -shaped tube into each beaker?Left beaker Right beaker Study Guide FOR Content MASTERYCHAPTER21voltaicelectrochemical cellelectric currentsalt bridgegalvanic WireIonsIonsPt2 2e 0 PtNi 0 Ni2 2e PtNiCl K Cl K Copyright Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, : Matter and Change Chapter 21 Study Guide for Content MasteryIn your textbook, read about the chemistry of voltaic each item in Column A, write the letter of the matching item in Column AColumn of the two parts of an electrochemical cell.

4 Whereeither oxidation or reduction takes electrode where oxidation takes electrode where reduction takes or more electrochemical cells in a single package thatgenerates electrical measure of the amount of current that can be generatedfrom an electrochemical cell to do workIn your textbook, read about calculating cell electrochemical the letter of the choice that best completes the statement or answers the tendency of an electrode to gain electrons is potential. sheet of platinum covered with finely divided platinum particles is immersed in a 1 MHCl solution containing hydrogen gas at a pressure of 1 atm and a temperature of25 C.

5 The platinum sheet is known as platinum chloride hydrogen electrode. chloride standard reduction potential of a half-cell is a measure of the following is the correct way to represent the equation,H2(g) + Cu2 (aq) 02H (aq) Cu(s)? H Cu2 Cu Cu H2 H H2 Cu Cu2 Cu2 H connected to a hydrogen electrode, an electrode with a negative standard reductionpotential will carry oxidation and oxidation nor continuedSTUDY Guide FOR Content Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Guide for Content MasteryChemistry.

6 Matter and Change Chapter 21123In your textbook, read about calculating cell electrochemical the table of standard reduction potentials below to answer the following you have two voltaic cells whose half-cells are represented by the followingpairs of reduction half-reactions. For each voltaic cell, identify which half-reaction willproceed in the forward direction as a reduction and which will proceed in the reversedirection as an Cell #1 Voltaic Cell #2Al3 (aq) 3e 0Al(s) Tl3 (aq) 3e 0Tl(s) Ga3 (aq) 3e 0Ga(s) Ga3 (aq) 3e 0Ga(s) the cell standard potential,E0cell, of each voltaic cell in question Cell #1:Voltaic Cell #2.

7 In your textbook, read about using standard reduction the table of standard reduction potentials at the top of this page to answer the fol-lowing the reduction and oxidation half-reactions for the following reaction:Tl(s) Al3 (aq) 0Tl3 (aq) Al(s)reduction half-reaction:oxidation half- is the standard reduction potential,E0, for each half-reaction in question 22?E0reduction:E0 the cell standard potential,E0cell, for the reaction in question the reaction in question 22 occur spontaneously as written?

8 Explain why or why the reverse reaction, Tl3 (aq) Al(s) 0Tl(s) Al3 (aq), occur spontaneously?Explain why or why continuedSTUDY Guide FOR Content MASTERYCHAPTER21 Half-reactionE0(volts)Al3 3e 0Al 3e 0Ga 3e 0Tl Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, : Matter and Change Chapter 21 Study Guide for Content MasterySection your textbook, read about dry cells, the lead acid storage battery, and lithium the table below by writing the type of battery described on the right.

9 Chooseyour answers from the following types:lead acid battery, lithium battery, mercury battery,nickel cadmium battery, zinc carbon dry the space at the left, write trueif the statement is true; if the statement is false,change the italicized word or phrase to make it a zinc carbon dry cell, a carbon rod serves as the produce electric energy by means of redoxreactions that are not easily advantage of alkaline cells is that they are largerthan a lead acid battery is generating electric current,sulfuricacid is consumed and lead(II)

10 Sulfate is cells, alkaline cells, and mercury batteries are examples to most other batteries, lithium batteries store a smallamount of energy for their are cell in a lead acid battery generates about 12 a mercury battery, liquid mercury is reduced, forming acid batteries and nickel cadmium batteries are examples Guide FOR Content MASTERYCHAPTER21 Type of used to power hearing aids and calculators because of its small standard, rechargeable automobile used in cordless drills, screwdrivers, and shavers because it is compact and most commonly used voltaic cell from the 1880s until , long-lasting battery often used in watches and computers to maintain time and date settingsCopyright Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Guide for Content MasteryChemistry.