UNIT 5 TEST 5 Madina June 2022

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University of Toronto *

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138H1

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Chemistry

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Oct 30, 2023

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7

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Electro Chemistry SCH4U Page 1 of 7 Student’s Name : Date: Test - 5 Knowledge / Understanding Thinking/Inquiry Communication Application Marks 13 12 10 15 50 PART - A: Knowledge/Understanding (13Marks) For each question, select the best answer from the alternatives. 1. The essential components of a galvanic cell are a. two different metals and an electrolyte b. two identical metals and an electrolyte c. two different metals and two different electrolytes d. two different metals and distilled water 2. What is the oxidation number of C in CH 2 O? a. –2 b. –1 c. 0 d. 2 3. In an electrolytic cell the strongest oxidising agent reacts at the a. anode and undergoes an oxidation b. cathode and undergoes a reduction c. anode and gains electron d. cathode and loses electrons 4. The ability of a half –cell to attract electrons under standard conditions is called the a. standard cell potential b. standard oxidation potential
Electro Chemistry SCH4U Page 2 of 7 c. standard reduction potential d. spontaneity potential 5. Electrolytic cells used in industrial processes may do all of the following except a. product elements b. refine metals c. plate metals d. produce electricity 6. Oxidising agents a. are mostly non-metals b. are mostly metals c. decrease in oxidation state d. are mostly transition metal 7. Which species is the oxidising agent in the following reaction? a. Cl 2 (aq) + 2I — (aq) --- I 2 (aq) + 2Cl — (aq) a. Cl 2 b. I — c. I 2 d. Cl -- 8. Match each term on the left with the most appropriate description on the right. ( K= 5) i). line notation A. involving a reaction that cannot easily be Reversed ii). electrolysis B. a brief way of describing a cell iii). half- reaction equation C. a method of cathodic protection iv). primary cell D. the use of electricity to force a non- Spontaneous reaction to occur
Electro Chemistry SCH4U Page 3 of 7 v). sacrificial anode E. a description of either the oxidation or reduction process i ii iii iv v PART - B: Thinking / Inquiry (12Marks) 9. Indicate whether each statement is true or false.( I=6) i. A battery is a group of galvanic cells connected in parallel. ii. The voltage of a cell depends on the concentration of the reactants present in the solution. iii. corrosion is the oxidation of metal. iv. A fuel cell is a galvanic cell for which the reactants are continuously supplied. v. Electrolysis involves forcing a current through a cell to cause a non spontaneous redox reaction to occur. vi. The sum of the oxidation numbers in a poly atomic ion must equal to zero. 10. Distinguish between Oxidising agent and reducing agent. ( I=2)
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Electro Chemistry SCH4U Page 4 of 7 11. With the help of a diagram explain the structure of a galvanic cell.( I=4) PART - C: Communications (10Marks) 12. Compare the galvanic cell with an electrolytic cell. ( Comm. 4)
Electro Chemistry SCH4U Page 5 of 7 13. a) What are the factors on which corrosion depends?(Comm. 2) b). Name three processes used to prevent corrosion. (Comm. 2) 14. If a substance is very strong reducing agent, what does this mean in terms of electrons? ( Comm 2)
Electro Chemistry SCH4U Page 6 of 7 PART - D: Applications (15Marks) 14. Calculate the standard cell potential for the galvanic cell in which the following reaction occurs: (App .3) 2I — (aq) + Br 2 (l)--- I 2 (s) + 2Br --- (aq) ( I 2 (s) + 2e-- --- 2I — (aq) = 0.54 ( Br 2 (l) + 2e -- -- 2Br — (aq)= 1.07) 13. Explain the buffer action.( App 3) 14. Describe the direction of movement of electrons and ions within the electrolytic cell. ( App 2)
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Electro Chemistry SCH4U Page 7 of 7 15. Balance the following equation in Acidic medium.( App 4) MnO 4 -- (aq) + C 2 O 4( 2— (aq) -- Mn 2+ (aq) + CO 2 (g). 16. One of the most successful batteries has been the lead – acid car battery. a. Identify the anode, cathode and electrolyte. b. What is some possible environmental impact of this battery? c. How are the large currents produced that are necessary to start a car? (App 3)

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