Oxidation-reduction Reaction Teaching Activity
The following is an example of a teaching activity on the oxido-reduction reaction: ** 1. Teaching objectives ** 1. ** Knowledge and Skill Target ** - To enable students to understand the concepts related to the oxido-reduction reaction. - To let the students grasp the characteristics and nature of the oxido-reduction reaction. 2. ** Course, Method, and Target ** - Through asking questions, organizing students to discuss and communicate, and group cooperation, the nature and characteristics of the oxidoreduction reaction were revealed, and the students 'ability to accurately understand the concept from a microscopic perspective was cultivated. 3. ** Emotions, attitudes, and values ** - Through exchanges and discussions, they could strengthen the cooperative learning between students. - Students were taught to understand the application of the oxido-reduction reaction in industrial and agricultural production and daily life, and to understand the important role of chemistry in improving the quality of human life and promoting social development. ** 2. Important and Difficult Points in Teaching ** 1. ** Teaching Focus ** - The nature and characteristics of the oxido-reduction reaction. 2. ** Teaching Difficulties ** - The nature of the oxido-reduction reaction. ** 3. Teaching process ** 1. ** import (import)** - Through the use of multi-media, some common chemical reactions were displayed, such as the image of the combustion of h2 and the image of the reduction of copper dioxide by h2. Then, please write down the chemical equations of the reaction, such as 2h2 + o2 = 2h2o, cuo + h2 = h2o + cuo. Then, the students were asked to judge whether these reactions were oxido-reduction reactions according to the knowledge they had learned in junior high school. The students were guided to discuss and come to the conclusion that the reaction with the participation of O2 was an oxido-reduction reaction. The above two reactions both had the participation of O2, so they were oxido-reduction reactions. 2. ** Analyzing the problem ** - Ask the students if there is any change in the chemical valency of the elements in the above reaction, and ask the students to mark the elements with the change in chemical valency. Using the example of <
>, the students were asked to discover the change in the valency of elements in the oxido-reduction reaction. Then, it explained that the oxidiser (such as O2/Cl2) would be reduced in the reaction, and the reducing agent (such as H2) would be oxided.
- Then, more reaction equations were shown through the media, such as = h2 + zncl2>,<2na + cl2>=2nacl>,<2kclo3>= 2kcl2 + 3o2>,= mncl2 + cl2 + h2o>,= caco3 +2nacl>,, etc. Let the students discuss and communicate, and classify them according to whether the chemical valency of the elements changes when the reagents change into products. Let the students understand that one kind of reaction is a reaction with a change in chemical valency (such as 1, 2, 3, 4), and the other kind is a reaction without a change in chemical valency (such as 5, 6). From this, it can be concluded that the characteristic of the oxido-reduction reaction is that the chemical valency of some elements participating in the reaction changes before and after the reaction.
3. ** Exchange and discussion **
- Show two reactions, 2na+ cl2 = 2nacl and h2 + cl2 = 2hcl2. Ask the students if these two reactions are oxido-reduction reactions and if their reaction processes are the same. Then, ask the students to write down the structure diagrams of the atoms,,,. According to the atomic structure diagram, the reaction process was analyzed. For example, the Na atom was easy to lose electrons in the reaction, the Cl-atom was easy to gain electrons, and the H-atom was easy to gain electrons.
4. ** Solve the problem **
- The illustrations in the textbook will be shown. Students are asked to understand the formation process of <> and <> according to the content of the pictures, thus revealing the essence of the oxido-reduction reaction. From the atomic structure diagram, it can be seen that the reaction process of and <> ci>> is a process of electron gain and loss (> has 1 electron in the outermost layer of the atom, and has 7 electrons in the outermost layer of the atom).
5. ** Reflection after class **
- The teacher reviewed the entire teaching process, thinking about whether the teaching method was appropriate, and how the students grasped the key and difficult points. For example, whether the students were given enough guidance when explaining the nature of the oxidoreduction reaction, whether the students had difficulties in analyzing the change of chemical valency and electron transfer, and so on.
6. ** Homework arrangement **
- The students would be given some exercises on the oxidoreduction reaction, such as determining whether a given reaction was a oxidoreduction reaction, finding out the oxidiser and the reducing agent in the reaction, etc. They could also look up materials to find some examples of oxidoreduction reactions in their lives and analyze their principles.
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Teaching and Research Record of Oxidation-reduction Reaction
The following are some teaching and research records related to the oxido-reduction reaction: - In the teaching and research activities in Kaifeng City, Teacher Wang Ruixin from the Affiliated High School of He University and Teacher Lin Fang from Kaifeng High School conducted a demonstration class on the same class of "Redox Reaction." Teacher Wang Ruixin started with the reaction of the reaction of the dilute sulfuric acid and introduced a variety of devices to create the prototype of the experiment, creating contradictions and conflicts in the knowledge points, guiding the students to explore the electron transfer in the oxidoreduction reaction and draw the distinction standard. The experimental design was from macro to micro and then to macro, novel and innovative. Teacher Lin Fang introduced the principle of alcohol detector through the drunk driving situation in life to carry out teaching. She paid attention to the connection between junior high school and senior high school knowledge. First, she analyzed the reaction with oxygen participation, and then inspired students to think about the reaction without oxygen participation. They were closely linked, which was in line with the law of student development. There was also Shoujin Wang's lecture on "The application of the NOBOOK virtual experiment in chemistry teaching." - During the first lesson of a public class named "Oxidation-reduction Reaction" by a teacher in a certain school, the principal commented that this class used a variety of teaching methods (mainly problem solving). The class was simple and direct, the students performed well in the questioning session, the explanation was thorough and patient, but the summary could be given to the students, the design of the learning plan could emphasize keywords, and the class could require students to wear uniforms. The teachers of the teaching and research group commented that the design of this lesson was clear, the concept of the oxidoreduction reaction was advanced layer by layer, and the students 'mistakes could be corrected in time when the practice of chemical valency rise and fall on the blackboard. The class time was arranged properly. - In the activity of the Chemistry Teaching and Research Group of Yong 'an No.1 Middle School, Huang Huawen set up a demonstration class on "Using the Oxidation-reduction Reaction to determine the content of substances". The teaching revolved around the determination of dissolved oxygen in water. Starting from the neutralization and titrification model, he analyzed the principle of the method of determining the oxygen content and demonstrated the titrification process. He introduced the principle of the chromicity method and the current measurement method. Finally, he summarized the method of using the oxidoreduction reaction to determine the content of substances. After class, the chemistry teachers evaluated the class and affirmed that the material selection for this class was innovative, the content was consistent, and it was in line with the cognitive law. - In the meeting organized by the Chemistry Teaching and Research Group of Zibo No.6 Middle School, the head of the class preparation team of Grade One of Grade One led to observe the open class of "Oxidation-reduction Reaction (First Class)" by Teacher Zhang Tongyao of Zibo No.5 Middle School, and shared relevant special speeches, which triggered thoughts on classroom teaching and digital experiments. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Oxidation-reduction Reaction in Core Cultivation
The core accomplishments included three aspects: cultural foundation, independent development, and social participation. The comprehensive performance was the six major accomplishments of humanity, scientific spirit, learning to learn, healthy life, responsibility, and practical innovation. In the teaching or learning process of the oxidoreduction reaction, it could be cultivated from multiple core literacy perspectives. From a scientific point of view, the oxidoreduction reaction was first proposed by the French mathematician Lavoisier in 1774. It was a chemical reaction that was widely used in nature and had important applications in many fields such as industrial production. Its essence was that the substances involved in the reaction had an electron transfer or shift reaction before and after the reaction. This required students to use rational thinking to understand the definition and composition of reactions (composed of half-reactions of oxidization and half-reactions of reduction). During the learning process, they had to be brave enough to explore the reasons why the reaction rate was affected by factors such as the concentration of the reagents, the acid, the temperature, the catalyst, and so on. They also had to maintain a critical attitude towards traditional views or conclusions. From the perspective of practical innovation, the oxidoreduction reaction was involved in many fields such as industry, agriculture, fossil energy, and drug development. For example, metal extraction, photosynthesis, plating, etc. in the industrial field, and soil fertilizer changes in the agricultural field, sunning fields, etc. This provided students with the opportunity to apply their knowledge to practical problem solving, and cultivated their practical ability, innovative awareness, and behavior in daily activities, problem solving, and adapting to challenges. This included realizing the connection between the results of labor and knowledge related to the oxidoreduction reaction, and using relevant knowledge to solve technical problems in actual production. From the perspective of learning how to learn, students should form a learning consciousness when learning the oxidoreduction reaction. For example, they should clearly understand the importance of the oxidoreduction reaction in understanding the phenomena in many fields, and choose the appropriate learning methods. For example, they should build a "valence-class-property" model to master the knowledge related to the oxidoreduction reaction of iron and its compounds. They should also be able to evaluate and control their own learning process. For example, when they find it difficult to understand the electron transfer in the oxidoreduction reaction, He adjusted his learning strategy in a timely manner. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Choice of Oxidants in Oxidation-reduction Reaction
When choosing an oxidiser for a oxido-reduction reaction, the following factors needed to be considered: 1. ** Oxidative Ability **: - According to the strength of the electron ability of the substance, the oxidiser could be divided into strong oxidiser, medium oxidiser, and weak oxidiser. Generally, oxygen and iron ions were used as the boundary. Materials with an oxidisation ability higher than that of oxygen were strong oxidisers, weaker than that of iron ions were weak oxidisers, and those in between were medium oxidisers. Common strong oxidisers include non-metallic simple substances such as F ^, O, etc.; high-priced compounds containing valence-changing elements such as KMn, KClO, etc.; metal ions such as Fe3, Cu2, etc. Among them, the oxidization of the fluorine was very strong, but in recent years, the chemical world had also discovered some substances with an oxidization greater than or comparable to the oxidization of the fluorine, such as krypton diflouride and dioxygen diflouride. - The oxidisation of the oxidiser was affected by many factors. In a solution, according to the electric double layer theory, the magnitude of the oxidisation was reflected by the standard hydrogen potential of the oxidiser. The higher the potential, the stronger the oxidisation. The hydrogen ion also had an effect on the oxidisation of the oxidiser containing oxygen. Generally, under acidic conditions, the oxidisation of the oxidiser containing oxygen was stronger than that of the oxidiser containing oxygen. However, for some species that were not affected by the hydrogen ion, such as Cl2, Br2, etc., the oxidisation was unrelated to pH. In addition, the molecular symmetries of the oxidiser also affected its oxidisation. Generally, the more symmetrical the molecules, the more stable they were. For example, peranate was not very oxidiser in water. 2. ** Reaction Condition **: - Different oxidisers had different reaction conditions. For example, krypton diflouride could not exist at room temperature. When the environmental temperature exceeded-30 ° C, it would begin to decompose. When reacting with gold, the temperature should not exceed 25 ° C. Otherwise, krypton diflouride would decompose rapidly and would not react with gold. When the temperature rises to-160 ° C, it can decompose 4% per day. When the temperature rises to-95 ° C, the decomposition speed is obviously accelerated. When the temperature continues to rise to-57 ° C, it will decompose quickly. Therefore, the reaction temperature should be controlled at around-100 ° C, not higher than-95 ° C. - When the temperature is 60°C, the decomposition rate of hydrogen dioxide is about 50%. When the temperature reaches 90 - 100° C, the decomposition rate of hydrogen dioxide can reach 90%. When the temperature is above 100 ° C, the decomposition rate of hydrogen dioxide begins to rapidly decompose. 3. ** Reaction product requirements **: If you don't want to introduce impurities, such as when hydrogen peroxideis used as an oxidiser, the product is water, and no impurities will be introduced. 4. ** Safety and cost **: For example, hydrogen dioxide solution (content greater than 8%) is an explosive chemical, and it is less cost-effective than other reducing agents. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Ion Combination of Oxidation-reduction Reaction
以下是一些由于氧化还原反应而不能大量共存的离子组合： 1. **酸性条件下**： - \(NO_{3}^{-}\)与\(I^{-}\)、\(Br^{-}\)、\(Fe^{2 + }\)、\(S^{2 - }\)、\(HS^{-}\)、\(SO_{3}^{2 - }\)、\(HSO_{3}^{-}\)等不能大量共存。例如\(NO_{3}^{-}\)在酸性条件下（\(NO_{3}^{-}+H^{+}\)组合）具有强氧化性，能氧化这些还原性离子。 - \(MnO_{4}^{-}\)与\(I^{-}\)、\(Br^{-}\)、\(Cl^{-}\)、\(S^{2 - }\)、\(HS^{-}\)、\(SO_{3}^{2 - }\)、\(HSO_{3}^{-}\)、\(Fe^{2 + }\)等不能大量共存。 - \(ClO^{-}\)与\(Fe^{2 + }\)、\(I^{-}\)、\(S^{2 - }\)、\(HS^{-}\)、\(SO_{3}^{2 - }\)、\(HSO_{3}^{-}\)等不能大量共存。 - \(Fe^{3+}\)与\(S^{2 - }\)、\(HS^{-}\)、\(SO_{3}^{2 - }\)、\(HSO_{3}^{-}\)、\(I^{-}\)等不能大量共存。 2. **碱性条件下**：\(S^{2 - }\)与\(SO_{3}^{2 - }\)可以共存，但在某些情况下也可能发生氧化还原反应，在酸性条件下则不能共存。 此外，一些离子在特定条件下存在氧化还原反应，影响离子的共存，在判断离子共存时需要考虑溶液的酸碱性等条件。 <a href="/?from=ask_words" style="color:red" target="_blank">点击前往免费阅读更多精彩小说</a>
Grade One Chemistry Lecture on Oxidation-reduction Reaction
氧化还原反应是高中化学的重要内容，以下是对其相关知识的讲解： **一、基本概念** 1. **化合价升降** - 在氧化还原反应中，存在元素化合价的变化。这是氧化还原反应的特征。例如，在反应\(2CuO + C = 2Cu+CO_{2}\uparrow\)中，铜元素的化合价从\( + 2\)价降低到\(0\)价，碳元素的化合价从\(0\)价升高到\( + 4\)价。 2. **电子转移** - 其实质是反应过程中有电子的得失或共用电子对的偏移。化合价升高的元素，其原子失去电子;化合价降低的元素，其原子得到电子。如上述反应中，碳原子失去电子，铜离子得到电子。 3. **氧化剂与还原剂** - 氧化剂是得到电子（或电子对偏向、化合价降低）的物质，具有氧化性。在反应\(CuO + H_{2}=Cu + H_{2}O\)中，\(CuO\)是氧化剂。 - 还原剂是失去电子（或电子对偏离、化合价升高）的物质，具有还原性。该反应中\(H_{2}\)是还原剂。 4. **氧化反应与还原反应** - 氧化反应是失去电子（化合价升高）的反应，还原反应是得到电子（化合价降低）的反应。在同一个氧化还原反应中，氧化反应和还原反应同时发生。 5. **氧化产物与还原产物** - 氧化产物是还原剂在反应中失去电子后被氧化形成的生成物。在\(Fe + 2HCl=FeCl_{2}+H_{2}\uparrow\)中，\(FeCl_{2}\)是氧化产物。 - 还原产物是氧化剂在反应中得到电子后被还原形成的生成物，此反应中\(H_{2}\)是还原产物。 **二、氧化还原反应与四种基本反应类型的关系** 1. **置换反应** - 全部属于氧化还原反应。例如\(Zn + H_{2}SO_{4}=ZnSO_{4}+H_{2}\uparrow\)，反应中锌元素化合价升高，氢元素化合价降低。 2. **复分解反应** - 全部属于非氧化还原反应。如\(HCl + NaOH = NaCl + H_{2}O\)，反应过程中各元素化合价均无变化。 3. **化合反应** - 有单质参加的化合反应全部是氧化还原反应，如\(2Na+Cl_{2}=2NaCl\)。 - 无单质参与的化合反应也可能是氧化还原反应，例如\(H_{2}O_{2}+SO_{2}=H_{2}SO_{4}\)。 4. **分解反应** - 有单质生成的分解反应全部是氧化还原反应，如\(2H_{2}O = 2H_{2}\uparrow+O_{2}\uparrow\)。 **三、氧化性或还原性强弱的比较规律** 1. **依据反应式判断** - 氧化剂+还原剂→氧化产物+还原产物，氧化性：氧化剂>氧化产物;还原性：还原剂>还原产物。例如在反应\(Cl_{2}+2FeCl_{2}=2FeCl_{3}\)中，氧化性\(Cl_{2}>FeCl_{3}\)，还原性\(FeCl_{2}>FeCl_{3}\)。 2. **依据反应条件判断** - 当不同的氧化剂作用于同一还原剂时，如氧化产物价态相同，可依据反应条件的难易程度来判断。例如\(Cu + 4HNO_{3}(浓)=Cu(NO_{3})2+2NO_{2}\uparrow+2H_{2}O\)，\(Cu+2H_{2}SO_{4}(浓)\stackrel{\triangle}{=}CuSO_{4}+SO_{2}\uparrow+2H_{2}O\)，可以得出氧化性：浓\(HNO_{3}>浓H_{2}SO_{4}\)。 3. **依据产物价态的高低判断** - 例如\(2Fe + 3Cl_{2}=2FeCl_{3}\)，\(Fe+S = FeS\)，因为\(Cl_{2}\)与\(Fe\)反应生成的铁的化合物中\(Fe\)为\( + 3\)价，\(S\)与\(Fe\)反应生成的铁的化合物中\(Fe\)为\( + 2\)价，所以氧化能力\(Cl_{2}>S\)。 4. **根据元素周期表判断** - 同主族元素从上到下，元素单质的氧化性逐渐减弱，还原性逐渐增强，对应的阳离子氧化性逐渐减弱，阴离子还原性逐渐增强;同周期主族元素从右到左，元素单质的氧化性逐渐减弱，还原性逐渐增强，对应的阳离子氧化性逐渐减弱，阴离子还原性逐渐增强。 5. **根据金属活动顺序表和非金属活动顺序表判断** - 在金属活动顺序表中，越靠前的金属还原性越强;在非金属活动顺序表中，越靠前的非金属氧化性越强。 6. **依据“两池”判断** - 在原电池中，负极金属是电子流出的极，正极金属是电子流入的极，其还原性：正极<负极。 - 用惰性电极电解混合溶液时，在阴极先放电的阳离子氧化性较强，在阳极先放电的阴离子还原性较强。 7. **依据“三度”判断（浓度、温度、酸碱度）** - 如氧化性：\(HNO_{3}(浓)>HNO_{3}(稀)\)、\(HNO_{3}(热)>HNO_{3}(冷)\)、\(KMnO_{4}(H^{+})>KMnO_{4}\)。 **四、解题技巧** 1. **理清两条主线** - 还原剂（化合价升高）→失去电子→发生氧化反应→得到氧化产物;氧化剂（化合价降低）→得到电子→发生还原反应→得到还原产物。 2. **抓住两个相等** - 氧化剂得到的电子总数与还原剂失去的电子总数相等;氧化剂化合价降低总数与还原剂化合价升高总数相等。 3. **理解三个同时** - 氧化剂与还原剂同时存在;氧化反应与还原反应同时发生;氧化产物与还原产物同时生成。 4. **会标电子转移的方向和数目** - 例如在反应\(2Na + Cl_{2}=2NaCl\)中，电子转移方向是从\(Na\)原子指向\(Cl\)原子，数目为\(2e^{-}\)。 <a href="/?from=ask_words" style="color:red" target="_blank">点击前往免费阅读更多精彩小说</a>
Use of the reduction reaction of the glyphs
The reduction reaction of acetadol was widely used in the chemical industry, such as the production of chemicals such as alcohol and ether. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Which one is the heat absorbing reaction, the oxidization reaction or the reduction reaction?
Oxidation and reduction reactions occurred simultaneously in a single oxido-reduction reaction. It could not simply be said that either of the reactions was heat absorbing. Oxidation-reduction reactions could be both heat absorbing and heat releasing. For example, the combustion reaction was an oxido-reduction reaction and was an exhalation reaction, while the formation of water gas was an absorption reaction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Will the reduction reaction be accelerated by the negative pole?
The term " negative potential " refers to the change in the negative potential caused by the flow of a negative current. During the process of the polar reduction, a reduction reaction would occur at the interface. This was because the polar reduction would cause the potential of the metal to shift negatively. When the equilibrium potential of the metal's oxido-reduction reaction was reached, the corrosion of the metal would be inhibited. This process was based on the principle of the polar reduction in electrochemistry, and the polar reaction in the polar reduction process was the reduction reaction. Therefore, the reduction reaction would be accelerated by the negative pole. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What does the reduction reaction of propylethalin produce?
Propanal would undergo a reduction reaction to form propan. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The role of fmn fad in the oxido-reduction reaction is
In the human body, it takes part in the oxidoreduction reaction in the form of FAD (flavine adenine dinuron dinuron) and Fmn (flavine monodiuron dinuron). It is a component of many important cozymes in the body. It plays an important role in maintaining the normal metabolism of protein, fat, and biochemistry, promoting normal growth and development, and maintaining the integrity of skin and mucus membranes. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>