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SMA 1 BAE KUDUS STUDENT WORKSHEET OF ELECTROCHEMICAL CELLS

Name: ……………………. Grade XII Semester 1 SMA 1 BAE KUDUS

Worksheet 1 DISCUSSION

Name ________________________________ Concentration Electrochemical Cells Pre-Lab Work in groups of three. GOTO: Nerst Cell Simulation 1. Start the software and construct a zinc-copper electrochemical cell using 1.0 M Zn2+ and 1.0 M Cu2+ solutions. a. What is the EMF of this cell (include units)? ____________________ b. For the voltage that you are measuring, is this E°cell or Ecell? ________. Explain. c. Write the chemical equation that represents the reaction occurring in this cell. d. Is this a spontaneous or non-spontaneous reaction? _______________________. Explain. e. Draw a cell diagram for this electrochemical cell. f. What is the oxidation half-reaction that occurs and where does it occur? Look at the molecular level animation. The anode is __________.

2. Construct two electrochemical cells such that the EMF of the cells are greater than +1.10 V. Before doing the simulation, predict the EMF of the cells. Prediction ___________ ____________. Explain. a. Draw the cell diagram for each of the electrochemical cells that you construct. b. What is the EMF of the two cells (include units)? __________ __________ c. The voltage that you are measuring, is this E°cell or Ecell? ________________ d. Is this a spontaneous or non-spontaneous reaction? _______________________ e. What is the oxidation half-reaction that occurs and where does it occur? Look at the molecular level animation. The anode is __________. ELECTROCHEMICAL CELLS

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f. Write the chemical equilibrium equation that represents the reaction occurring in this cell. g. Construct two electrochemical cells such that the EMF of the cells are less than +1.10 V. Before doing the simulation, predict the EMF of the cells. Prediction ___________ ____________. Explain. h. Draw the cell diagram for each of the electrochemical cells that you construct. i. What is the EMF of the three cells (include units)? __________ __________ _____________ j. Write the chemical equilibrium equation that represents the reaction occurring in these cells. h. What is the function of the salt bridge? 3. CONCLUSSION

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Worksheet 2 EXERCISES TEST A. Multiple choice

1. In the following reaction of hydrogen peroxide serves as an oxidant, except ....

2. The oxidation number of S in ion S2O32- is .... a. 6+ b. 5+ c. 4+ d. 3+ e. 2+ 3. Among the following redox reactions that have the equivalent is ... ..

4.

In the redox reaction equation: then a and b are respectively ...... a. 2 and 5 b. 1 and 3 c. 2 and 4 d. 3 and 5 e. 4 and 7

5.

The amount of Fe 2+ which can be oxidized by 1 mol Cr2O72- produce Fe3 + and Cr3 + is ...... a. 2 mol b. 3 mol c. 4 mol

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d. 5 mol e. 6 mol 6.

A redox reaction has equation: then the reaction coefficient values for a, b, c, d, and e are ... .. a. 2, 3, 2, 4, 6 b. 8, 3, 2, 3, 4 c. 8, 2, 3, 3, 4 d. 4, 2, 2, 3, 4 e. 2, 3, 8, 4, 3

7.

Given the reduction potential: Then the cell potential for the reaction:

is the .......

a. -1.22 V b. +1.22 V c.

2.0 V

d. -2.0 V e. -2.1 V 8.

Given E0 = Zn2 + / Zn = -0.76 V Cu 2+ / Cu = +0.34 V Fe 2+ / Fe = -0.41 V Ag + / Ag = +0.80 V Pb 2+ / Pb = -0.13 V Chemical cells following cell produces the greatest E0 is ....... (Cell potential E0) a. Zn / Zn2 + (aq) // Cu 2+ (aq) / Cu (s) b. Fe / Fe 2+ (aq) // Ag + (aq) / Ag (s) c. Zn / Zn2 + (aq) // Ag + (aq) / Ag (s) d. Pb / Pb 2+ (aq) // Cu 2+ (aq) / Cu (s) e. Zn / Zn2 + (aq) // Pb2 + (aq) / Pb (s)

9.

Given the reduction potential of the data as follows: E0 Ca2 + / Ca = -2.87 V E0 Pb 2+ / Pb = -0.13 V

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E0 Mg 2+ / Mg = -2.37 V E0 Au3 + / Au = +1.50 V Which of expected reactions can take place?

10. Metal cadmium placed in a solution of CuSO4 1.0 M. At a temperature of 250 C, E0 Cd2 +

/ Cd = -0.4 V and E0 Cu 2+ / Cu = +0.34 V, then ......

a. No reaction occurs between Cd and CuSO4 solution b. Cd reduce Cu 2+ ions c. Cu reduce Cd 2 + ions formed d. Cu 2+ ions reduce Cd e. Cd reduce ion SO4211. Given the standard potential for the following cell reaction, Based on the potential prices can be concluded that all three metals in the above sequence in descending order of reductant is .... a. Ag, Fe, Zn b. Ag, Zn, Fe c. Fe, Zn, Ag d. Fe, Ag, Zn e. Zn, Fe, Ag 12. In the industrial area, the air may contain gases SO2, CO2, NO2, O2, N2, and CO2. couples gases can cause corrosion is .... a. O2dan N2 b. CO and NO c. CO2 and CO d. SO2 and NO2 e. CO and H2O 13. Where a corroded metal, the metal .... a. reducsion reactions b. undergo oxidation reaction and forming oxide c. hydrolyzed to form a solution ELECTROCHEMICAL CELLS

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d. receive electrons from O2 in the air e. to form toxic compounds 14. The statement below that is not true of the dry cell is ......

15. What is used as the anode in batteries is ... a. Zn b. PbO2 c. Pb d. PbSO4 e. Cu

B. ESSAY 1. Given: Cu 2+ / CuE0 = +0.39 V Ag + / Ag E0 = 0.8 V Define: a. Cell reaction with Ag and Cu electrode b. Notation voltaic cells c. Cell potential price! 2. Draw the direction of electron flow in the external circuit and the electrolyte solution or liquid in a voltaic cell consisting of Cu in CuSO4 solution and metal Zn in ZnSO4 solution! 3. Why alkaline zinc-carbon batteries are more durable than ordinary zinc-carbon batteries? 4. Why does the fuel cell is called the cell the future? 5. Describe the reaction with the process: a. The occurrence of rust on iron b. Iron from rust protection when coated zinc!

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Worksheet 3

Analyze The Relationship between SETS element based Concept Motion Rim Regular

Technology

Science Electrochemical Cells

Society

Environment

Note Fill that blank cyrcle with your responsibled argument

Table 1. Expansion Analysis SETS Science

Technology

Environment

Society

Etc. This table can you renew

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Assignment 1  Create membered group of 4 to 5 people per group or permanent study group.  For each group, do the following.  In line with the results of your analysis in point table 1, make a news clipping from a newspaper / magazine / print media of any information relating to electrochemical cells. Put information relating to the benefits, impact, handling, and other information sources. Encourage every news clipping with analyzes SETS.  Clipping made by one group may not be the same as the clipping of other groups, at least in terms of sources of news / information (The benefit less)  Arrange neatly clipping the relation between the information content of thought in clipping  On the last page, write down a list (list) you can work developed based on the analysis SETS along with a brief description of activities in the job (with the possible dangers that it caused-the very small) to be implemented either by kids your age who wish to work or more mature age. Examples of formats and filling the list may in Table 2.

Table 2. Formats and data entry jobs visionary SETS which can be developed from the concept of Electrochemical cell

WORK RELATED TO ELECTROCHEMICAL CELLS visionary SETS Work

Job Description

Etc. This table can you renew

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 volume and give you the cover of clipping results.  Completion of tasks performed during the weeks since giving tasks.  Assessment based on: the suitability of the content of the news by theme (electrochemical cells), depth of analysis, creativity and weight scrapbook news

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