(1) carbon monoxide can react with oxygen, it can capture the same as the hydrogen in the copper oxide oxygen it? Both reduction of copper oxide is the same device?
(2) ask someone to think about the following questions first, then design a device of carbon monoxide reduction of copper oxide. ① leads to carbon monoxide can react with copper oxide completely? ② How to complete the unreacted carbon monoxide into the air lingers Plaza? ③ how to test the generated gas? ④ hydrogen reduction of copper oxide should be the device to make improvements?
Over time, the student's thinking has been limited, and not to think about why, will not take the initiative to think about for a way to experiment. This is the quality of students the scientific, innovative spirit and ability have been incompatible. Therefore, in the experimental teaching, experimental efforts to deepen reform, promote quality science teaching, to develop students ability to innovate is imminent. Here, I combined the practice of recent years, talk about their own understanding and practices. To solve the above teaching content and teaching methods of the drawbacks, I shall endeavor to penetrate the experimental teaching new curriculum ideas. Junior high school chemistry curriculum in the existing system, must be thinking, teaching content reform and the reform of three experimental teaching methods start.
Keywords new curriculum; chemistry; experimental teaching
1, update the experimental teaching ideas. The goal of the new curriculum is to train students to develop innovative, practical ability, scientific and cultural literacy and environmental awareness, so that students have to adapt to the basics of life-long learning, basic skills and methods. This requires to change the past, dependent on experimental teaching the theory of teaching,
ed hardy uk, to focus only on the basic theoretical knowledge and experimental validation of methods and skills training model. Accordance with the new curriculum ideas in the teaching process with particular attention to correct some students do not like hands, like the back of experimental study habits, students learn independence and autonomy, so that experimental teaching as they questioned, information collection and processing, to explore practical activities. Teachers must change their teaching ideas,
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A third-year students in weekly, wrote: really novel, it is our turn to do their own, and initially felt interesting, but do a few experiments, we found quite boring chemistry experiments. Because we do experiments in the classroom the teacher has done, and do not know the results ... without any creativity. Students do experiments, often step by step according to the experimental procedure textbooks do.
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summary of new chemistry curriculum standards that the new philosophy of education, made a number of issues worth considering, in junior high school chemistry experiment in how to penetrate a new curriculum, junior high school chemistry teacher is facing new problems. In this paper, new curriculum requirements for chemical experiments and the current status of the teaching experiment that updates the concept of teachers, reform of validation experiments and closed-end experiments, to improve the experimental and the means to cultivate the spirit of cooperation of students is one effective way.
2, change validation experiments to explore the test. The existing materials are mostly in the experimental validation experiments, we should change the traditional teaching of experimental model that allows students to take the initiative to operate, explore, draw conclusions. Carbon monoxide reduction of copper oxide demonstration, I have to explore the experiment in teaching the first to prep coaching:
3, change to open closed-end experiments experiments. Awareness of the problem of human chemistry certain stage, some problems can not be a perfect answer. This requires us to teaching,
herve leger skirts, can not be too absolute about certain issues, such as the laboratory system with potassium permanganate oxygen, the oxygen is collected in red, apparently, this is not the true nature of oxygen, is why ? How to improve the device do? Students have to speak, some said: fortress mouth tube a mass of cotton; and some say: a group can be stuffed with sponge, gauze, napkins, glass, etc., the answer is really varied. Another example is the red phosphorus in oxygen in the combustion experiments, the resultant is to enable students to come to the conclusion smoke or fog is very difficult, the teachers insist that the white smoke, the students difficult to accept, so I will grasp this opportunity to mobilize the enthusiasm of the students, so Students design experiments to prove in the end is the smoke or fog. The introduction of open experiment, its meaning is not immediately get a clear conclusion, but rather to stimulate students to explore, pursue, under certain conditions to be relatively satisfied with the conclusion in the interest of the scientific development of the law.
through exploration activities, not only the concept of is in the process of training the students to explore the spirit of innovation.
4, improved experimental apparatus and experimental methods. Traditional teaching methods not only lack of innovation to create a large number of students, teachers also lazy to create. Therefore, I concentrated excavation materials in teaching, teaching materials in a bold experiment to improve existing shortcomings. Such as white phosphorous burn experiments before and after the determination of quality, white phosphorus is virulent, access time is not convenient, white phosphorus is sometimes placed in a conical flask, not the entire device weighing a good quality of white phosphorus on the spontaneous combustion. So I improve this: Take a small grain Commelina benghalensis (broken after the match to be) placed in a test tube, plugged with a rubber stopper and test tube clamp onto, along with weighing scales placed, and then heating the test tube, so Commelina benghalensis waned and then weighed, the balance is still a balance can be observed, but also clearly see the white smoke generated inside the tube and white smoke continued to sink, further phosphorus pentoxide density than air, also to enable students to recognize, chemical on the side. Through experiments to improve, not only to stimulate the students to explore the interest of scientific knowledge, but also in unconsciously inspired wisdom of the students, activation of the innovative thinking of students.
(3) draw the improved device sketches. Have the knowledge to guide students in analyzing, reasoning,
Salvatore Ferragamo outlet, design installations, and then asked the two students instead of teachers in the classroom experiment, the teacher finally summarized. Laboratory method for making hydrogen, materials that: laboratory common zinc and hydrochloric acid or sulfuric acid extraction, why not magnesium,
Oakley sunglasses sale, aluminum, iron, copper and other metals and concentrated hydrochloric acid, concentrated sulfuric acid as raw material it? Thus, I inspire and guide students to design an experiment ideas, and then separately by different groups of students conduct experiments to explore, record experimental results, discuss the draw the right conclusion to the whole class to report the group's conclusions. Materials in the experiment can also be changed to explore the experiment, such as carbon dioxide in the laboratory system of law; acid, alkali, salt, the nature of the experiment, and so on. More articles related to topics：
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