Vessels and reaction vessels can be directly heated instruments

Containers that can be heated directly:

1. Test tube: a commonly used instrument in the test tube chemistry laboratory, used as a reaction vessel for a small amount of reagents, at room temperature or when heated (it should be preheated before heating, otherwise the test tube is easy to burst.) ) use.

There are many types of test tubes, such as ordinary test tubes, supported test tubes, and centrifugal test tubes. The specifications of ordinary test tubes are expressed in outer diameter (mm) and length (mm), such as 200, etc.

2. Crucible: The crucible is an important part of chemical instruments, it is a container for melting and refining metal liquids and solid-liquid heating and reaction, and is the basis for ensuring the smooth progress of chemical reactions. There are many models and specifications of the crucible, which are not limited by the production scale, batch size and variety of smelted substances in the application, and can be selected arbitrarily, with strong applicability, and can ensure the purity of the smelted substance.

3. Combustion spoon: The combustion spoon is riveted with iron wire and copper spoon, which is used to hold flammable solid substances for combustion experiments (especially the combustion reaction of substances in gas). When the burning spoon is used, if the substance (such as sulfur) contained in the spoon can react with iron and copper, a layer of fine sand should be contained.

4. Evaporation dish: Evaporation dish is a vessel that can be used to evaporate concentrated solutions. It can be heated directly on a tripod, or indirectly with an asbestos net, water bath, etc., and when heated, it can be stirred with a glass rod.

Commonly used specifications are centimeters and so on according to the size of the caliber. Different specifications can be selected according to different applications.

Evaporation dishes are generally made of porcelain, but can also be made of glass, quartz, platinum or copper. Different materials and different corrosion resistance should be appropriately selected according to the properties of solutions and solids. Good stability to acids and alkalis. It can withstand high temperatures, but should not be quenched.

There are the following common ones in junior high school.

Direct heating: test tubes, evaporation dishes, crucibles, burning spoons, etc.

Pad asbestos mesh heating: beakers, flasks, Erlenmeyer flasks, etc.

What cannot be heated: measuring cylinders, jars, fine-mouth bottles, dropper bottles, gas collection bottles, etc.

A chemical instrument that can be used as both a reaction vessel and a direct heating vessel is a test tube.

Test tubes, commonly used instruments in chemical laboratories, are used as reaction vessels for a small number of reagents, and are used at room temperature or when heated (they should be preheated before heating, otherwise the test tubes are easy to burst). There are many types of test tubes, such as ordinary test tubes, supported test tubes, and centrifugal test tubes. The specifications of ordinary test tubes are expressed in outer diameter (mm) and length (mm), such as 200, etc.

[Main uses].

1) Hold liquid or solid reagents.

2) Heat a small amount of solid or liquid.

3) Make a small amount of gas reactor.

4) Collect a small amount of gas.

5) Dissolve a small amount of gas, liquid or solid solute.

6) Centrifugation is used as a container.

7) Used as a reaction vessel for a small amount of reagent, at room temperature or when heated.

【Modeling】A test tube with a wooden stopper.

1) The flat-mouth test tube is a flat-mouth glass tube with a round bottom, and the nozzle is melted. Flat mouth, easy to disinfect and kill bacteria at the nozzle.

2) A roll-mouth test tube is a round-bottomed glass tube with a curled edge (or round mouth) at the mouth. The roll (or round mouth) is used to increase the mechanical strength, and at the same time to facilitate the clamping and not easy to fall off.

3) Fermentation test tubeIt is a flat-mouthed, round-bottomed test tube with a thin and short diameter (diameter 6mm, length 30mm).

4) The test tube with a branch is a flat-mouth test tube with a side branch tube, and its side branch tube is mainly used to connect with the suction pipe, and the nozzle is inserted into the filter funnel with a rubber plug with a hole to replace the micro-filter bottle and serve as the receiving bottle for micro-filtration. Graduated test tube: It is a round-mouthed test tube.

The capacity scale marking is engraved on the tube body, and the measurement number can be read directly, which is easy to use.

It can be used as a reaction vessel and can be directly heated by the test tube.

Reaction vessel refers to the vessel used to complete the physical reaction and chemical reaction of the medium. In industrial production, especially in chemical, pharmaceutical, fertilizer, refining and other industries, the reaction vessel is widely used as a pressure-bearing equipment due to the needs of the process.

The reaction vessels are:

Test tubes, evaporation dishes, crucibles, burning spoons, etc.

Instruments that can be heated but must be padded with asbestos netting are beakers, flasks, Erlenmeyer flasks, etc.

Instruments that cannot be heated: gas collectors, funnels, etc.

Introduction: Reaction vessel refers to a kind of container equipment used to carry out chemical reactions of substances, such as reactors, generators, reactors, decomposition towers, synthesis towers, polymerization kettles and other reactions. Most of the reactions in the container are carried out under high temperature, high pressure, or even ultra-high pressure conditions, and the raw materials and catalysts involved in the reaction are mostly flammable and explosive substances.

A slight carelessness in the reaction process will cause fire and **, and the accident rate is high. The fire caused by the powerful shock wave generated by the reaction vessel and the leakage of toxic, flammable and explosive materials can easily lead to the collapse of buildings, a large number of personnel, and some even cause chains, razing the entire workshop and factory to the ground.

It is very important to strengthen the research on the fire accident of the reaction vessel and prevent the occurrence of such accidents.

Test tubes, crucibles, evaporation dishes, and burning spoons.

Test tubes, commonly used instruments in chemical laboratories, are used as reaction vessels for a small number of reagents, at room temperature or when heated (should be preheated before heating, otherwise the test tube is easy to burst. ) use.

The crucible is an important part of chemical instruments, it is a container for melting and refining metal liquids, as well as solid-liquid heating and reaction, and is the basis for ensuring the smooth progress of chemical reactions.

Evaporation dishes can be used to evaporate concentrated solutions or vessels that burn solids. The mouth is large and the bottom is shallow, and there are two kinds of round bottom and flat bottom with handle. The most commonly used is porcelain evaporation dishes, but there are also glass, quartz, platinum, etc.

The combustion spoon is made of iron wire and a copper spoon riveted and is used to hold flammable solid substances for combustion experiments (especially the combustion reaction of substances in gases). When the burning spoon is used, if the substance (such as sulfur) contained in the spoon can react with iron and copper, a layer of fine sand should be contained.

The combustion spoon is made of iron wire and a copper spoon riveted and is used to hold flammable solid substances for combustion experiments (especially the combustion reaction of substances in gases).

Beakers, flasks, test tubes, etc., directly act on the alcohol lamp for heating.

Test tubes, evaporation dishes, crucibles, burning spoons, etc.

The instruments that can be used to heat the liquid include test tubes, beakers, flasks, evaporation dishes, etc.

Instruments for heating solid substances include: test tubes, evaporation dishes, crucibles, etc.

Instruments that can be heated directly: test tubes, evaporation dishes, crucibles, burning spoons, etc.

a. The beaker can be used as a reactor, so the beaker can be used as a reaction vessel b. The gas collector cylinder can collect gas and can also be used as a reactor but cannot be heated, so the gas collector cylinder can also be used as a reaction vessel

c. It can be used to measure the volume of liquid and cannot be used as a reactor, so the graduated cylinder cannot be used as a reactor d. The test tube can be used for direct heating and can also be used as a reactor

e. Erlenmeyer flask can be used as a reaction vessel

Therefore, c; d．

Answer: CA, beaker, can be used in reaction vessels for reactions that require a larger amount of solution; Therefore, a can be used as a chemical reaction vessel;

b. Test tubes, which can be used for a small amount of drug reactions, such as pyrolysis of potassium permanganate, etc.; Therefore, b can be used as a chemical reaction vessel;

c. Graduated cylinder, used to measure a certain volume of liquid, not used in reaction vessels; Therefore, c cannot be used as a chemical reaction vessel;

d. Gas collection cylinder, used to collect gas noise, and some simple combustion experiments can also be carried out in the gas collection cylinder; Therefore, d can be used as a chemical reaction vessel;

Therefore, c;