coordination compounds class 12 revision

There were many things that needed to be reflected on in Yuan's review class: 1. ** Introduction of revision **: For the revision of the graphics content, if the students draw a circle first and then intuitively review the names of the various parts of the circle according to the drawn circle, the effect would be better than directly asking the learning content of this unit, because it would be more intuitive, especially when there are questions on how to draw a circle later. 2. ** Difficulty of questions and student level ** - ** Fill-in-the-blanks and True or False Questions **: The difficulty should not be too high. More attention should be paid to middle and lower class students. After completing the theoretical questions, the class would read them again to help deepen their memory. - ** Diagram calculation questions ** - ** Calculation of circumference **: The simple calculation of circumference is easy for students to master, but students often forget part of the calculation content for slightly more difficult questions. During revision, students can be reminded to draw the circumference first before calculating in detail. - ** Circle Area Calculation **: Students are prone to making mistakes when calculating the area of a ring. There are three situations in a ring, including knowing the radius or diameter of the inner circle and outer circle, knowing the radius or diameter of the inner circle and the ring width, and knowing the radius or diameter of the outer circle and the ring width. However, the revision may only involve the first situation. The second situation is more difficult for the less advanced students to solve the problem. - ** Problem solving section **: The questions designed are more difficult, such as finding the cross-section area, ring area, and comprehensive questions. 3. ** Overall Class Duration **: Yuan's revision content is suitable to be divided into two classes. The first class will be for theoretical review and basic questions review, and the second class will be for medium and high difficulty questions. This will better suit the class. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following are some key points for reflection on the revision of the fraction multiplication class: ** I. Teaching Method and Students 'Dominant Status ** 1. ** Combination of lecture and practice ** - In the revision class, the combination of teaching and practice helped to bring out the students 'main position. For example, let the students think and complete the questions on their own, then go on stage to answer and explain the methods. If they have any questions, they can communicate freely and finally correct them collectively. In this way, the entire process was communicated, discussed, and explained by the students. The students were highly motivated and proactive, and even students with learning difficulties could actively participate. 2. ** Teamwork ** - Teamwork was also an effective teaching method. In the practice, through the cooperation between the groups, the method of leading the poor students was adopted. In this process, the focus was on cultivating the excellent students 'ability to explain questions, guiding the excellent students to use practical operations to help the students with learning difficulties understand and master the knowledge and skills about fraction multiplication. This would not only help the students with learning difficulties improve, but it would also save time in the classroom and allow the teachers to pay more attention to the students with learning difficulties. However, when designing the questions, one had to take into account the characteristics of the gifted students to avoid wasting their time on simple questions. ** 2. Type of fraction multiplication and calculation points ** 1. ** Multiplying scores by scores ** - Directly using the rules, the product multiplied by the numerator was the numerator of the product, and the product multiplied by the numerator was the numerator of the product. If it could be reduced, it would be reduced first before calculating. When calculating, you should pay attention to the number after the numerator reduction and write it up, and the number after the decimal reduction should be written down. 2. ** Multiplying an integral with a fraction ** - Because any whole number could be regarded as a fraction with a 1 as the Denominator, the calculation method was the same as multiplying a fraction by a fraction. It was also to reduce the fraction before calculating. 3. ** Multiplying Decimals and Fraction ** - If there was a multiple relationship between the decimals and the numbers of the fraction, it could be calculated by reducing the fraction first, or it could be calculated by multiplying the fraction by the fraction. 4. ** Multiplying scores by scores ** - He converted the score into a fake score and then multiplied it by the score. ** 3. Problems and improvements in teaching ** 1. ** Explanation Method of the exercises ** - The traditional practice class was often a repetitive process of doing questions, checking, correcting, explaining, and continuing. It was easy for students to lack a sense of freshness and rhythm. He could try the model of " doing questions, checking, finding errors, explaining, changing, and reflecting ". He could dig out the test points and possible variations behind the exercises, giving the initiative to the students, allowing them to have more time to think deeply, improve their computing power, and reduce their calculation errors. 2. ** Attention to students of different levels ** - In the design of the review class, the needs of students of different levels should be considered. If the overall difficulty of the questions was low, it might make the time of the excellent students insufficient; if the difficulty was too high, it might make it difficult for the students with learning difficulties to keep up. Therefore, the difficulty of the questions should be arranged reasonably so that every student could have a greater harvest in the revision class. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

In 1904, it was discovered that in the presence of copper powder, the reaction of aromatic compounds and substituted aromatic compounds could give diarylethers. This reaction was called the Ullmann condensation reaction, but no other cases of the reaction of ordinary aromatic compounds and substituted aromatic compounds were mentioned. Some studies mentioned the use of a large number of alcoholic groups contained in natural polyphenolic substances to effectively activate percarbonates to improve the dechlorination effect of chloride-substituted compounds, but there was no more information about the direct reaction between the two. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following is a lesson plan and reflection on the movement coordination ability training of small class children: ** I. Teaching plan: "Small Class Movement Coordinated Ability Training"** #(I) Teaching objectives 1. Let the child master the basic movements that help to improve the coordination of movements, such as simple throwing, jumping, turning, etc. 2. Stimulate the interest of the child to actively participate in activities that train his or her movement coordination ability. 3. To enhance the child's initial understanding of the importance of physical coordination. #(II) Difficulties in Teaching 1. ** Main point ** - Guide the child to do the correct actions that will help improve the coordination ability, such as hand-eye coordination when throwing a ball, balance control when jumping, etc. - Let the children actively participate in various coordination training activities. 2. ** Difficulty ** - According to the individual differences of the children, ensure that each child can gradually improve their movement coordination ability during the activities. #(3) Teaching preparation 1. A few small balls, a few baskets, small obstacles suitable for children to jump (such as small colored squares), and cheerful music. #(IV) Teaching process 1. ** Warm-up (5 minutes)** - Playing cheerful music, the teacher led the children to do simple warm-up exercises, including rubbing their hands, twisting their waists, swinging their arms, and so on. 2. ** Pitching Training (10 minutes)** - Place two baskets in the middle of the field and draw two horizontal lines about two meters away from the baskets. - Let all the children stand behind the horizontal line, distribute a small ball to each child, and tell the children to throw the ball into the basket. - Each time, two children were asked to throw the ball. If they threw it in, everyone applauded. If they did not throw it in, they would continue to throw until they threw it. - After all the children had finished a round of throwing, they were given balls again and continued to throw. 3. ** Jumping training (10 minutes)** - Set up a few small obstacles at one end of the field and let the children start from the other end of the field and jump over these small obstacles in turn. - The teacher first demonstrated the correct jumping movements, emphasizing the control of the take-off point and landing point to ensure the balance and coordination of the body. - The children jumped one by one, and the teacher gave guidance and encouragement. 4. ** Turn Training (10 minutes)** - Play the slow-paced music. The teacher will demonstrate the turning movements first, such as turning left, turning right, etc. - The child followed the rhythm of the music to practice turning around. The teacher observed and corrected the child's movements to ensure that the child's body remained stable and coordinated during the turning process. 5. ** Relax (5 minutes)** - The teacher led the children to roll the ball gently on their arms and various parts of their bodies to achieve the effect of relaxing the body. - During the relaxation process, a brief summary of the activity was given and the children who actively participated in the activity were praised. #(5) Extension of Teaching 1. In subsequent activities, the difficulty of shooting could be increased, such as shooting continuously under the basket, or increasing the height and density of jumping obstacles. 2. Children are encouraged to go home and do similar exercises with their parents. ** 2. Reflection: ** 1. ** Success ** - The activities designed in the lesson plan were rich and varied, covering throwing, jumping, turning and many other movements, training the children's movement coordination ability from different aspects. - In the teaching process, through demonstration and encouragement, most children could actively participate in the activities, and the classroom atmosphere was more active. - The setting of the warm-up and relaxation segment was more reasonable, allowing the child to be prepared before the activity began and to be effectively relaxed after the activity. 2. ** Inadequacies ** - For children with weak coordination, the attention and guidance during the activities were not detailed enough, which may lead to the improvement effect of these children in the activities was not obvious. - In the teaching process, although the overall participation of the children was high, some children might only participate for fun, and their understanding of the improvement of movement coordination and its importance was not deep enough. - The preparation of the activity field and teaching materials could be further optimized. For example, the distance setting of the shooting field might need to be adjusted more accurately according to the actual situation of the child. 3. ** Modification measures ** - For children with weak coordination, special coaching time could be arranged, or more attention and individual guidance could be given in group activities. - In the teaching process, add some simple explanations to convey the importance of movement coordination to children in a more vivid and easy-to-understand way, such as through small stories or small demos. - According to the actual performance of the children in the activities, the layout of the venue and the use of teaching materials were further optimized to ensure that every child could carry out the training of movement coordination ability in the appropriate environment and conditions. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following is a reflection and improvement on the physical fitness and coordination training lesson plan for the small class: ** 1. Reflection ** 1. ** Teaching content ** - There might not be enough variety. For example, if you only focus on one or a few specific physical movement training, such as simple jumping or rolling, it may feel monotonous for small children, and they may not be able to fully exercise the coordination of various parts of the body. - There was a challenge in controlling the difficulty. The physical fitness and coordination foundation of the children in the lower classes might be underestimated, and the tasks set might be too difficult or too easy. If it was too difficult, children might feel frustrated because they could not complete it, and if it was too easy, it would not effectively improve their physical fitness and coordination. 2. ** Teaching Steps ** - It lacked fluency. For example, during the activity, the preparation of equipment or the change of scene may not be fast and smooth enough, causing the child's attention to be distracted. For example, when preparing for an activity that requires the use of a ball or mat, if too much time is spent preparing, the child may lose interest or start to have chaotic behavior. - The transition between the segments was not natural enough. From one physical training action to the next, or from the physical training segment to the coordination training segment, children may not be well guided, making it difficult for them to quickly adapt to new requirements. 3. ** Child participation ** - Some children might not be very motivated. This might be because the teaching content lacked interest and did not fully integrate the elements that children liked, such as stories and children's songs. It could also be that there was a lack of sufficient incentive mechanism, and the child did not receive timely affirmation and encouragement after completing the action. - There was insufficient attention to individual differences. There were also individual differences in physical fitness and coordination among children in small classes. Some children might perform better in certain movements, while others needed more guidance and practice. However, the lesson plan might not have designed different training strategies for such individual differences. ** 2. Enhancements ** 1. ** Teaching content ** - Increase the variety. He could combine a variety of simple physical and coordination training movements, such as jumping, walking in a straight line, bending down to pick up things, and so on, into a small training process. It was like imitating the activity path of small animals. First, he would learn to jump like a rabbit, then walk like a duck, and finally bend down to pick up fruits like a monkey. - The difficulty level was adjusted according to the actual ability of the children in the small class. You can start with simple basic movements, such as jumping on both feet on the spot, and then gradually increase the difficulty, such as jumping on both feet or jumping on one foot in front of obstacles of a certain height. At the same time, during the teaching process, observe the child's reaction at any time and adjust flexibly according to the actual situation. 2. ** Teaching Steps ** - Make ample preparations in advance. Make sure the equipment is ready and placed in the right place to reduce the preparation time during the teaching process. For example, the required balls, mats, and other equipment were placed around the activity venue in advance for the children to use. - He designed a natural transition. Children could be guided to the next stage through simple children's songs or stories. For example, during the transition from jumping training to crawling training, you could say," The little kangaroo is tired of jumping, and now it wants to crawl like a little caterpillar." 3. ** Child participation ** - Increase the fun. Combining the children's familiar songs or stories to carry out physical fitness and coordination training. For example, during the balance beam training, you could say," We have to walk across this bridge to Grandma's house like brave Little Red Riding Hood." - Establishing an incentive mechanism. Promptly affirm and encourage every small progress of the child, such as giving a small sticker or a hug to the child who completed the action well, and setting some small goals. When the entire class or group completed a certain training task, they could give collective rewards, such as playing a Mini games together. - Pay attention to individual differences. For children with poor physical fitness and coordination, one-on-one guidance or special auxiliary exercises could be arranged. For example, for children with poor balance, they could first practice on a shorter and wider balance beam to gradually increase the difficulty. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following is a reflection on the addition and deduction of the second root: ** 1. Students 'Knowledge Mastery ** 1. ** Simple Problem ** - Students had difficulty in decomposing the radical. For example, a number like 32 could not be decomposed into 16 by 2 at once, but into 4 by 8. It could not be decomposed completely. He also couldn't completely understand the decomposition of the numbers 108 and 98. This reflected that the students were not familiar with the decomposition of numbers, which was crucial for the reduction of the second root. - When the square root was a fraction, the student's grasp was even worse. For example, when the numerator of the root was 8 or 27, many students directly multiplied it by 8 or 27, resulting in a large amount of calculation and easy to make mistakes. In fact, multiplying by 2 or 3 could simplify it. This meant that the students did not understand the simplest method of rational multiplication of the square root. 2. ** Combining the same kind of square root problems ** - When combining the same kind of square root, the students made more mistakes when combining the coefficient, especially when the coefficient was a score. This reflected the students 'lack of knowledge in the calculation of scores and similar terms. The teacher needed to explain more and explain in detail when explaining the step of combining the same kind of square roots. ** 2. Teaching strategy ** 1. ** Practice and Test ** - From the perspective of teaching effectiveness, it required more teaching, more practice, and more testing. Currently, only one-third of the students were correct after the test. Under normal circumstances, two-thirds of the students should be correct. If time allowed, they could create a second root topic exam with about 20 questions. They would conduct a second exam for the questions that made a lot of mistakes. They would make up for the mistakes made by the students after the second exam to promote the students 'proficiency in the algorithm. 2. ** Teaching methods ** - In the teaching process, we should pay attention to the application of analogy, such as analogy of similar terms, combination of similar terms, and integral addition and deduction to guide students to understand the definition of similar square roots and the rules of square root addition and deduction. This will allow students to naturally migrate to new knowledge on the basis of existing knowledge, establish the connection between old and new knowledge, and form a mathematical knowledge system. At the same time, by creating a living situation or designing a series of questions as a teaching situation, it can stimulate students 'interest in learning and thirst for knowledge, and improve the effectiveness of classroom teaching. 3. ** Pay attention to the individual aspects of students ** - In the classroom, they should always pay attention to the students 'psychology and students with learning difficulties, and give students appropriate encouragement, enlightenment, and evaluation. For example, when a student made a mistake, such as writing on the blackboard, they had to find other students to provide help in time and guide the students to reflect on the reasons for the mistake. In group studies, students should be encouraged to cooperate and explore independently, so that students can exchange their own opinions and put forward their own opinions for everyone to comment. Teachers should go deep into the group to collect information, guide learning, and give full play to the students 'main role. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Under basic conditions, the reaction of the two reagents would produce 1-methylethylpropal, which could be used to produce tribution. From the structural changes of the reaction, the condensation of the-Chu reaction of the crystallizer and the CH-reaction of the crystallizer would produce a-CH = CH -double bond and a unit of water. The product structure was the aromatic ring- CH = CH-Chu. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The adjective form of revision is revised or revisionary. " Choose " was equally exciting. Everyone was welcome to read it!

Well, to isolate novel compounds, you first have to do thorough research on the substances you're dealing with. Then, choose the appropriate extraction and purification methods based on their properties. It can be quite challenging and requires precision and expertise.

Novel compounds are new chemical substances that haven't been discovered or described before. They can be identified through various methods like advanced analytical techniques in chemistry labs.