How to teach chemistry experiments in junior high school 15 minutes competition

There are experimental steps in the chemistry experiment competition.

Chemistry experiment competition is an important form of chemistry competition. The chemistry competition takes the form of experiments, which is determined by the characteristics of the discipline itself.

It is an important way to stimulate students' interest in learning, cultivate experimental skills, improve scientific literacy, and enhance team awareness and innovation ability.

The chemistry experiment competition is divided into the following steps:

1. Proposition. The principle of the proposition should be based on the scope of the middle school chemistry experiment and related to the middle school experiment. The content includes the basic operation of chemistry experiments in middle school, the series connection of comprehensive experiments, the joint design of experiments, the separation and identification of substances, and the improvement of experimental instruments and operations.

2. Make a volume. The chemistry experiment competition will have two parts: written test and experiment, first answer the written test questions, and then operate according to the experimental operation questions.

3. Experimental operation, auspicious data collection and analysis, and recording phenomena.

4. Experimental summary and report. Annihilation Silver.

Chemistry experiment plays an extremely important role in chemistry teaching, and chemistry experiment is the most intuitive, vivid and convincing teaching method in chemistry teaching.

There will be experimental steps, that is, the content of the middle school experiment syllabus, there are no special requirements, the key is to complete the experiment, and through the experiment to have the necessary analysis of experimental phenomena.

Introduction

The National College Students' Chemistry Experiment Invitational Contest is the highest-level competition in chemistry in China's colleges and universities, and is sponsored by the Chemistry Education and Research Center of Colleges and Universities of the Ministry of Education. The competition aims to promote the reform of chemistry laboratory teaching mode, teaching content and teaching methods in colleges and universities in China, and explore the ideas, ways and methods of cultivating innovative chemistry talents, so as to improve the overall level of chemistry laboratory teaching in China.

The introduction of the event adheres to the tenet of "testing the achievements of chemistry laboratory teaching reform, strengthening exchanges, summarizing experience, and exploring ideas, ways and methods to cultivate and improve the innovation ability of undergraduates", and the spirit of "re-participation, light ranking" runs through the whole of the invitational competition.

The tournament is held every two years. The 11th Invitational CompetitionThe 11th National College Student Chemistry Experiment Invitational Competition will be held at Fuzhou University from July 6 to 9, 2018, and 129 third-year chemistry students from 43 universities across the country will participate.

The total performance of the contestants is formed by the written test score (30%) and the experimental operation score (70%), and the organizing committee of the invitational competition determines the list of winners according to the total score of the contestants, and all kinds of experiments are ranked separately.

The above content refers to: Encyclopedia.

There are experimental steps in the chemistry experiment competition, and you must work hard to do a good job in the practical operation of the pure ruler of the chemical experiment in order to achieve good results! During the competition, the contestants carried out operations such as pH titration and crude salt purification according to the given solution and experimental instruments.

Arrows and equal signs:

In the literature of the professional collar search field, the arrow sign " is used to connect reactants and products in both inorganic and organic reaction equations. Foreignization is used as a textbook for higher education.

In 2013, the equations of inorganic reactions in middle school were all connected by equal signs, and the organic reactions were all connected by arrows, and all reversible reactions were represented by reversible symbols.

Shanghai Middle School Chemistry Phase II Curriculum Reform Textbook (Shanghai Science and Technology Press, July 2006, edited by Yao Zipeng -2012 Sujiao Edition of Chemistry Book, Shanghai College Entrance Examination Chemistry Paper, Science and Chemistry Paper, also use arrow marks. However, in the teaching of middle schools in most provinces and cities, it is still recommended to use equal signs when writing the equations of inorganic chemical reactions according to the textbooks, so as to better represent the meaning of "generation" and "conservation of mass" in the reaction.

Effect of manganese dioxide dosage on reaction rate.

1.Manganese dioxide promotes the decomposition of hydrogen peroxide.

2.Within a certain range, the amount of manganese dioxide reads, the faster the catalytic rate.

3.However, when the amount of manganese dioxide reaches a certain amount of simple tung dioxide, the reaction reaches a certain limit, and the minimum time used is 2 seconds.

4.When the amount of manganese dioxide is small, the change of the amount of socks used is more obvious.