Precautions for the use of chemical equipment in junior high school

Medicine spoons are just medicines used for powders, and lumpy items are clamped with tweezers. The test tube evaporation dish in the glassware can be heated directly, like the beaker heating must be heated indirectly with asbestos nets, and the rest of the items can not be heated, like the Erlenmeyer flask test tube The beaker can be used as a reaction vessel, and the rest generally cannot, the glass rod can not touch the four walls when stirring, and it should be quiet, and the glass rod should be rinsed in time when it is used, and the liquid should be added vertically from the mouth of the tube 1 cm when the rubber head dropper is used, like potassium permanganate to make oxygen, the test tube mouth should be plugged with a small amount of cotton, and after collection, the trachea should be moved first, and then the alcohol lamp should be withdrawnWhen ventilating and heating copper oxide, ventilate first, after heating, ventilate and retreat, assemble the instrument from bottom to top, from left to right, if it is like an exothermic experiment, remember to put a small amount of water or spread fine sand at the bottom of the bottle, use the balance with tweezers to clamp the weight, you should know, but also remember that when dialing the weight, you should also use tweezers to dial, my experience is so much, I hope to help you.

The spoon is not a solid or powdered item and cannot be used anywhere else.

The glass rod cannot be heated, and it cannot be knocked (as long as it is a glass instrument, it cannot be knocked), and the test tube and evaporation dish can be directly heated.

To use asbestos netting, there are beakers (bottles) and so on.

None of the other conventional instruments can be heated.

1.All stoppers should be placed upside down. Cover tightly when you use it.

2.Combustible gases need to be purified when burning.

3.Glass rods can drain water. stirring, etc. Drainage should be done close to the inner wall of the container.

4.In general, the instrument should be removed and then the alcohol lamp should be extinguished (to prevent water from backflowing).

5.Beakers cannot be heated directly. An asbestos mesh can be added between the flame and the beaker to heat.

6.When using KMNO4 to produce oxygen, cotton must be added to the mouth of the test tube. Nothing else matters.

7.All impurities that affect the results of the experiment should be removed.

8.Toxic other applications should be collected with airbags (just keep this in mind.) generic) 9.Generally speaking, Ca(OH)2 is only used to verify CO2Generally not used to remove CO2The best addition to CO2 is NAOH

10.Alcohol and other fires should be extinguished with a damp rag. Do not use water.

11.Good luck!

over.

When potassium permanganate is used to produce oxygen, the test tube should be tilted downward.

When hydrogen reduces copper oxide, hydrogen gas must be passed first, and then heated.

After the drainage method produces the gas, take out the catheter first, and then extinguish the alcohol lamp...

I don't know if you're looking for this, uh

I agree with the opinion of the blue dream Qianlixun.,There are really too many instruments.,It's impossible to say everything.,Too muchMaybe you're too lazy to look at it.,It's big to see so much.,So as long as you master some of the more commonly used ones.,It doesn't seem to be too much during the exam.,That kind of question.。。。

1. When diluting concentrated sulfuric acid, it should be noted that sulfuric acid should be poured into water, not into sulfuric acid.

2 When filtering, the funnel should be tightly attached to the inner wall of the beaker and drained with a glass rod.

Different instruments have different precautions!Please elaborate on what instrument!

1.Before the experiment, carefully preview the experimental content, clarify the experimental purpose, basic principles, steps, operation methods and precautions, and be familiar with the drugs, instruments and devices required in the laboratory. Write a pre-study report. Check whether the instruments and reagents are complete.

2.Abide by the discipline and rules and regulations of the laboratory, and do not be late, leave early, or skip class.

3.During the experiment, observe the order, keep quiet, do not make loud noises, do not move around at will, and do not leave without permission.

4.Listen to the teacher's guidance, conduct experiments in strict accordance with the operating procedures and experimental procedures, think positively, carefully observe the experimental phenomena, and make records realistically.

5.Take care of experimental instruments and equipment, do not take them indiscriminately, do not take public property out of the laboratory, return it in a timely manner when borrowed for official business, register damaged items truthfully, and report problems in time.

6.Weigh or measure the medicine in strict accordance with the regulations, even if the bottle cap is closed and the medicine is put back in its original place after use. It is necessary to save water, electricity, gas and consumable medicines.

7.During the experiment, special attention should be paid to observing whether the instrument has air leakage or rupture, and whether the reaction is normal. If any abnormality is found, it should be reported to the teacher in time

8.Keep your lab clean and hygienic. In the laboratory, the desktop, floor, sink and instruments are clean. Waste paper, waste liquid, etc. should be put into the waste tank, and it is strictly forbidden to throw or pour it into the sink to prevent blocking or corroding the sewer.

9.After the experiment, sort out the instruments and medicines, and do a good job on duty. Turn off the power and turn off the gas and water switches. You can only leave the laboratory after being checked by the teacher.

10.According to the experimental records, write the experimental report carefully and submit it to the instructor on time.

What do you want me to say about so many instruments?

Medicine spoons are just medicines used for powders, and lumpy items are clamped with tweezers. Glassware in test tubes.

The evaporation dish can be heated directly, like a beaker heating must be heated indirectly with an asbestos mesh, and the rest of the items cannot be heated, like an Erlenmeyer flask.

Flask. Test tube.

The beaker can be used as a reaction vessel, the rest generally cannot, the glass rod can not touch the four walls when stirring, when the sound is made, to be quiet, when the glass rod is used up, it should be rinsed in time, and the liquid is added vertically suspended from the nozzle 1 cm when the rubber head dropper is used, like potassium permanganate to make oxygen, the test tube mouth should be plugged with a small amount of cotton, after collection, the trachea should be moved first, and then the alcohol lamp should be withdrawn, the copper oxide should be ventilated first, and the ventilation should be withdrawn after heating, and the instrument should be assembled from bottom to top, from left to right, if it is like an exothermic experiment, Remember to put a small amount of water or spread fine sand at the bottom of the bottle, and use tweezers to hold weights with a balance, you should know, but also remember that you should also use tweezers when dialing weights, my experience is so much, I hope it can help you.

1.The solution poured into the evaporation dish shall not exceed 2 3 of the container, and it is easy to splash (overflow) when it is heated if it exceeds 2 3.

2.When heating the solution with an evaporation dish, there is no need to pad the asbestos net.

Evaporation dishes are porcelain products that can be heated directly.

3.When the solution in the evaporation dish is viscous and more solids appear, the heating is stopped.

After the evaporation of the residual heat, if the heating continues, the national body is easy to splash out of the limbs.

1.The filter paper in the filter fits snugly against the funnel wall.

Prevent the filtrate from flowing from the filter paper and the funnel wall into the beaker.

2.The nozzle at the lower end of the drain bucket is close to the inner wall of the beaker.

Prevents liquid spillage during filtration.

1. First of all, you must carefully read the instruction manual of the instrument;

2. The new instrument should be unpacked and registered, and the instrument file should be established;

3. The installation of the instrument should be carried out under the guidance of technicians or above;

4. When using the instrument, be sure to pay attention to the start-up and preheating of the instrument;

5. Operate carefully and cautiously according to the instrument manual, test the performance of the calibration instrument, and reach the normal state;

6. After the instrument is used, the instrument should be cleaned and the power supply and water source should be turned off.

7. If the instrument is abnormal, the instrument should be shut down for testing, and professional technicians should be asked to deal with it if necessary, and the individual should not wait for blind movement.

Precautions for the use of chemicals (i.e. pharmaceuticals):

1. Before using chemicals, be sure to know their name, performance, safety characteristics, and correct operation methods;

2. The operation of volatile drugs should be carried out in the fume hood (open the bottle);

3. Corrosive drugs should be operated with anti-corrosion gloves, glasses or masks;

4. There are safety precautions in the operation methods of the specified operation experiments, which must be implemented conscientiously;

5. Be sure to keep it in accordance with the storage conditions of the drug;

6. The experimental waste liquid of highly toxic drugs must be paid attention to, and arbitrary discharge is strictly prohibited;

7. The use of drugs should be reduced. It is taboo to use drugs in a big way, and pay attention to the principles of environmental protection and conservation.

Rubber tip dropper: 2It cannot be turned upside down. 3.Do not reach into the container.

Test tube clamps: 1Cover from the bottom of the tube upwards. Clamp in the upper middle of the tube.

Iron frame: one-third from the nozzle.

Pallet Balance: 1Adjust to level. 3.First increase the weight, then add the small weight, and finally move the game.

Evaporation dish: 1No more than two-thirds of the volume. 2.Use mud triangle clamping. =_=

1. You wrote the wrong word "Tim", 1) so as not to cause dangerous accidents and disasters.

Align the drug with heating.

2) Cause a boiling outburst and the liquid splashes out.

Increasing the heating area, is "bursting" you wrote wrong.

3. 1. Moisten with water.

Screw in slowly; so as not to damage the container;

container rupture; 2. a sink; Container; Bubble; A section of water column is generated.

3. clear water; Oscillating; test tube brushes; The test tube ruptures.