How to write a summary of the chemistry experiment report in the third year of junior high school

Experiment Name: Drainage Gas Gathering Method Experimental Principle: Oxygen is not easy to tolerate water Instrument Drug:

Potassium permanganate, manganese dioxide, trachea, test tube, gas collection cylinder, alcohol lamp, sink Experimental procedure: Check --- the airtightness of the device. Fill the --- with the medicine and plug it tightly with a rubber stopper with a catheter...

1. Writing of chemical experiment report: Under normal circumstances, chemical experiment report is written from seven aspects according to the experimental procedure and sequence: 1. Experimental purpose:

That is, what is the goal or purpose of this experiment. The experiment can be carried out with a clear purpose to avoid students being aimlessly busy, so it is necessary for teachers to check the experiment preview before class. 2 Date of Experiment and Experimenter:

Indicate the time of the experiment and the name of the experimenter below the name of the experiment. This is an important piece of experimental information that can be checked in future searches. 3 Experimental Instruments and Medicines:

Write down the main instruments and drugs, which should be classified and listed, and should not be omitted. This writing can help students to think about the use and use of instruments, the effects of drugs and the specific chemical reactions that can occur, so as to help them understand the principles and characteristics of experiments. It is important to note that the experiment report should contain the concentration of the reagent used to complete the experiment and the specifications of the instrument.

Because different concentrations of reagents used often give different experimental results, students should also understand the specifications of the instrument, and not just stay at the stage of "big test tube" and "small beaker". 4. Experimental procedures: Design the experiment according to the specific purpose and principle of the experiment, and write the main operation steps, which is an important part of the report.

This item can enable students to understand the whole process of the experiment, clarify the purpose of each step, understand the design principle of the experiment, master the core part of the experiment, and develop a scientific thinking method. In this item, the precautions for the experiment should also be written to ensure the smooth progress of the experiment. 5 Experiment Log:

Record experimental phenomena or data correctly and truthfully, use professional terms for accurate expression, and try to avoid the appearance of spoken language. This is the main part of the report, and in the record, students should be asked not to revise even if the results obtained are not satisfactory, but to find out the causes and solutions through analysis and discussion, and to develop a realistic and rigorous scientific attitude. 6 Experimental Conclusions and Explanations:

It is the key to the theory of experimental connection by using the known chemical knowledge to analyze and explain the operations carried out and the related phenomena obtained, and to draw conclusions, which is helpful for students to raise their perceptual understanding to rational understanding, and further understand and master the known theoretical knowledge.

1. Purpose of the experiment:

1. Cultivate students' experimental idea of "using the known to measure the unknown through experimental means".

2. Learn the use of relevant instruments, and master the principles and operation steps of acid-base titration

3. Realize the combination of learning and practice.

2. Experimental equipment and drugs

Instrument: one titration table, one 25ml acid (alkali) burette, one 10ml pipette, and two 250ml Erlenmeyer flasks.

Drugs mol lnaoh solution mol l salt socks acid mol l oxalic acid (oxalic acid dihydrate), phenolphthalein reagent, methyl orange reagent.

Third, the principle of covering the test:

Neutralization titration is a reaction in which an acid and a base interact to produce salts and water, which are experimentally unknown to the unknown. That is, the unknown concentration of the alkali (acid) solution is completely neutralized with the known concentration of acid (alkali) solution, the volume of the two is determined, and then the concentration of the unknown solution is found according to the stoichiometric number of the two in the chemical equation.

Acid-base titration usually uses hydrochloric acid solution and sodium hydroxide solution as standard solutions, however, because concentrated hydrochloric acid is volatile, sodium hydroxide is easy to absorb water and carbon dioxide in the air, so it cannot be directly prepared into an accurate concentration solution. Oxalic acid (oxalic acid dihydrate) was used as the reference material in this experiment.

1. Sodium hydroxide solution calibration: when the reaction of H2C204+2NaOH=Na2C204+2H20 reaches the end point, the solution is weakly alkaline, and phenolphthalein is used as an indicator. (Titration twice in parallel).

2. Hydrochloric acid solution calibration: HCI+NaOH=NaCl+H2O

5. Data analysis:

1. Calibration of sodium hydroxide solution concentration: acid-base titration experiment report.

2. Calibration of hydrochloric acid solution concentration: acid-base titration experiment report.

6. Experimental results:

1. The measured concentration of the substance in the sodium hydroxide solution is mol l

2. The measured concentration of hydrochloric acid is mol l

Content from user: yuboanhui

No. 1] Change in the substance of Experiment 1.

Experiment Type: Confirmatory experiment.

Objectives:1Observe experimental phenomena, recognize different changes in matter, distinguish between physical changes and chemical changes;

2.Preliminary familiarity with the correct experimental operations such as liquid extraction, liquid heating, grinding and dissolution of solid particles, dropwise addition of solution, and pouring of liquid.

Experimental supplies: iron frame (with iron clamp), test tube, alcohol lamp, match, glass piece, mortar (pestle), single-hole plug (with catheter);

Distilled water, copper sulfate crystals, sodium hydroxide solution, limestone (or marble), dilute hydrochloric acid, clarified lime water.

Experimental process: experimental procedure, experimental phenomenon, conclusion and explanation

1.Add about one-fifth of the volume of water to the test tube, fix it with an iron rack, light an alcohol lamp and heat it to a boil, and move it closer to the mouth of the test tube with a cold and dry glass sheet. There is a .

In this process, the water is heated from a liquid state to water vapor, and then condensed into liquid water, the water itself changes, and new substances are formed. ｜

2.Take a small amount of bile alum, put it in a mortar, and grind it with a pestle. The blue granular cholelum turned into . The cholelum changes from a solid to a solid, and new matter is formed. ｜

3.Add a small amount of ground bile alum powder and a small amount of water to each of the 2 test tubes, and shake until all the copper sulfate is dissolved. Add several drops of sodium hydroxide solution to one of the tubes.

Add sodium hydroxide solution dropwise to the test tube. It shows that in the process of change, new substances are formed. ｜

Divided into 6 steps:

1): The purpose of the experiment, specifically write the requirements to be achieved and the tasks to be achieved by the experiment.

2): The principle of the experiment is to write what your experimental operation is based on, which is generally available in your experiment book, and you can summarize it. (You can use the reaction equation above).

3): Experimental supplies, including experimental equipment, liquid and solid medicines, etc. (Such as alcohol lamps, filter paper, and glass rods, the latter two are used for filtration, this should be wanted.) ）

4): Experimental procedures: also available in the experiment book.

5): Experimental data recording and processing.

6): Problem analysis and discussion.

For example, the purpose of the experiment is to learn to make oxygen by yourself and observe the combustion phenomenon in pure oxygen!

Experimental materials: iron frame, two gas collection cylinders, test tubes, catheters, alcohol lamp, tweezers. Potassium permanganate, charcoal, fine iron wire.

Experimental steps: 1. Connect the device, take an appropriate amount of potassium permanganate and put it into the test tube, light the alcohol lamp to heat 2, and collect oxygen by drainage.

3. Burn the charcoal and put it into the gas cylinder filled with oxygen with tweezers. The red-hot fine wire is put into the gas collection cylinder 4 and the phenomenon is observed.

Conclusion: The combustion in pure oxygen is more severe than in air.

The name of the experiment, the purpose of the experiment, the principle of the experiment, the experimental drug, the experimental equipment, the experimental procedure, the experimental phenomenon, and the experimental conclusion can be written in this order.

1. Purpose of the experiment:

Second, the principle of experiment.

3. Experimental materials.

Fourth, the experimental procedure.

5. Experimental results.

6. Analysis of results.

There is an article here that comprehensively summarizes the various question types of chemistry experiments in the high school entrance examination, which is very good.

Including chemical experimental instruments, special experimental devices, chemical experimental operations, material heating, gas laboratory preparation methods, chemical equations, reduced metal oxides, universal bottles, combustion, coarse salt purification, and substance testing.

The following experiments are generally tested in the experimental operation examination for high school admissions: 1 laboratory to produce carbon dioxide, 2 laboratory to produce oxygen and test, 3 preliminary purification of yellow mud water, 4 evaporation and crystallization of solution, 5 properties of carbon dioxide, 6 chemical properties of iron, 7 chemical properties of sodium hydroxide, 8 identification of sodium carbonate and sodium chloride two white solids, 9 identification of sodium carbonate, calcium carbonate and sodium chloride three white solids, 10 ** neutralization reaction, 11 ** properties of soda ash, 12 Preparation of saturated salt solution, 13 Determination of white acetic acid alkalinity, 14 Detection of starch in food (food and chemistry).

Pay attention to the contents of the appendix of the textbook, including: introduction of experimental equipment, experimental precautions, etc.

Moreover, it is necessary to focus on reviewing the following experiments: 1 laboratory preparation of carbon dioxide, 2 laboratory preparation of oxygen and testing, 3 preliminary purification of yellow mud water, 4 evaporation and crystallization of solution, 5 properties of carbon dioxide, 6 ** chemical properties of iron, 7 ** chemical properties of sodium hydroxide, 8 identification of sodium carbonate and sodium chloride two white solids, 9 identification of sodium carbonate, calcium carbonate and sodium chloride three white solids, 10 ** neutralization reaction, 11 ** properties of soda ash, 12 preparation of saturated salt solution, 13 Determination of white acetic acid alkalinity, 14 Detection of starch in food (food and chemistry).