【Daily Question】12.5 Galvanic Cells and Electrolytic Cells (2 wealth points for a reply + additional 3–8 wealth points for a correct answer)
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This post was last edited by lzy4225925 on 2015-12-6 09:39. The Mechanical Section has introduced the \"Question of the Day\" feature, which not only helps to foster an active atmosphere for technical discussions and guide the direction of such exchanges but also provides users with financial rewards, enabling them to experience various cool features. Topic: Primary cells and electrolytic cells are widely used in daily life and industry. The following judgment is incorrect: http://pic2.mofangge.com/upload/papers//20140824/2014082415084413422191.png Device ①, Device ②, Device ③. A. Device ① studies the oxygen-induced corrosion of metals; the reaction on Fe is Fe – 2e = Fe2+. B. Device ② deals with the electrolysis of CuCl2 solution, converting electrical energy into chemical energy. C. Device ③ involves the electrolysis of saturated saltwater; during this process, an oxidation reaction occurs at pole B. D. The main reactions involved in all three devices are redox reactions. C. Please note: We will close this thread after 24 hours, and at that time we will announce the best response (the most helpful answer), along with the answers and explanations. Charisma Reward: Those who post a topic in this section within two days to provide a detailed explanation or discussion on the knowledge points related to this question are asked to reply/comments in this post to inform us, and we will then award them charisma points. It is not allowed to simply copy and paste; original content is preferred, with at least some organization by the user along with personal insights and opinions. After registration, we will rank participants based on the content of their posts: the last-place contestant will receive +1 charm, the second-to-last +2 charm, and so on, with the highest score earning +5 charm. Other details: Recruitment for moderators & technicians in the [Mechanical Area] – applications and referrals are welcome. 【Valid indefinitely】【If you’re interested, come ahead!】 】(Click to enter) 【Mechanical Zone】Comprehensive guide to preventing equipment freezing over winter in the Mechanical Zone 【Mechanical Zone】Call for collection of essential knowledge 【Seeking manufacturer sponsors】(Ongoing campaign) 【Rewards for recommending valuable content; the “Active Users and Weekly Stars” competition in the Mechanical Zone has begun】
Primary cells and electrolytic cells are widely used in daily life and industry. The following judgment is incorrect: (C)
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D. The main reactions involved in the three devices are all redox reactions
C. Device ③ studies the electrolysis of saturated salt water; during the electrolysis process, an oxidation reaction occurs at pole B
Primary cells and electrolytic cells are widely used in daily life and industry. The incorrect judgment among the following is C. Device ③ is used to study the electrolysis of saturated salt water; during the electrolysis process, an oxidation reaction occurs at electrode B
Primary cells and electrolytic cells are widely used in daily life and industry. The following statement is incorrect: http://pic2.mofangge.com/upload/papers//20140824/2014082415084413422191.png Device ①, Device ②, Device ③. A. Device ① studies the oxygen-induced corrosion of metals; the reaction occurring on Fe is Fe – 2e- = Fe2+. B. Device ② involves the electrolysis of CuCl2 solution, converting electrical energy into chemical energy. C. Device ③ deals with the electrolysis of saturated salt water; during this process, an oxidation reaction occurs at electrode B. D. The main reactions involved in all three devices are redox reactions. Analysis: A. In Device ①, Fe, C, and salt water form a galvanic cell. In a neutral environment, iron is prone to oxygen-induced corrosion; iron acts as the negative electrode, and the reaction that takes place is Fe – 2e- = Fe2+, which is correct ； B. In device ②, pole b is the cathode; cations are discharged, so red copper is deposited, which is correct ； C. In device ③, pole B acts as the cathode; during cation discharge, hydrogen is released from pole B, while chlorine should be released from pole A – this is incorrect ； D. Electrochemical reactions are all redox reactions; correct.
Device C① is used for electrolyzing copper chloride solution; a is the anode where an oxidation reaction occurs to produce chlorine gas, and b is the cathode where a reduction reaction occurs to produce copper； Device ② is iron’s oxygen absorption corrosion ； Device ③ is a device for electrolyzing saturated salt water; B is connected to the negative pole of the power supply and serves as the cathode of the electrolytic cell, where hydrogen and sodium hydroxide are produced. Answer: A. Device ① is used for electrolyzing copper chloride solution; a is the anode where an oxidation reaction occurs to produce chlorine gas, while b is the cathode where a reduction reaction takes place to produce copper, which is a red solid. Therefore, A is correct ； B. Saltwater is neutral; iron undergoes oxygen-induced corrosion and is oxidized, so the reaction on Fe is Fe – 2e– = Fe2+, hence B is correct ； C. Device ③ is a device for electrolyzing saturated salt water; B is connected to the negative pole of the power supply and serves as the cathode of the electrolytic cell. According to the reaction 2H++2e-=H2↑, C is incorrect ； D. The main reactions involved in the three devices are all electrochemical reactions, namely redox reactions; therefore, D is correct.
Primary cells and electrolytic cells are widely used in daily life and industry. The incorrect judgment among the following is C. Device ①, Device ②, Device ③: A. Device ① studies the oxygen-induced corrosion of metals; the reaction on Fe is Fe – 2e⁻ = Fe²⁺. B. Device ② deals with the electrolysis of CuCl₂ solution, converting electrical energy into chemical energy. C. Device ③ involves the electrolysis of saturated saltwater; during this process, an oxidation reaction occurs at pole B. D. The main reactions involved in all three devices are redox reactions