What is the upward air exhaust method in the production of oxygen? Be detailed!

The drainage method is suitable for gases that are insoluble in water, and the upward exhaust method is suitable for gases that are heavier than air (that is, gases with a relative molecular mass greater than 29, oxygen 32 can be, the jar is being placed, and the catheter is stretched into the bottom of the bottle, because the collected gas is heavier than the air, the air is squeezed out), and the downward exhaust method is suitable for gases that are lighter than air, such as hydrogen and ammonia, and the jar is inverted and the catheter is extended into the bottom of the bottle

Oxygen can be collected using the upward exhaust method and the drainage method.

Hydrogen peroxide heating can produce oxygen, but it is generally not used in the laboratory because a large amount of water vapor will be generated, and the laboratory produces oxygen by heating potassium permanganate to produce potassium manganate manganese chloride and oxygen, because no impurity gas is produced The laboratory can also heat potassium chlorate and manganese dioxide (manganese dioxide as a catalyst) to produce potassium chloride and oxygen

In industry, the air depressurization method is used (80% of the air is nitrogen, 20% is oxygen, and the boiling points of the two are different).

High school textbooks say that there are submarines that use sodium peroxide and carbon dioxide exhaled by humans to produce oxygen.

It's an upward emptying method.

The gas collector cylinder containing the gas denser than oxygen is fixed, and the air duct that produces oxygen is inserted into the 1 3 places of the gas collector cylinder.

What a strange question!

The upward air discharge method is that the mouth of the gas collection cylinder is upward, and the conduit extends to the bottom of the gas collection cylinder, and the principle of oxygen (32) is heavier than air (29) is used to discharge the air in the cylinder to achieve the purpose of collecting oxygen. ok?

It is to put the mouth of the gas collector bottle downward, according to the density of oxygen is smaller than the air, when the oxygen goes to the gas collector cylinder, the air is discharged downward.

The oxygen collected by the air exhaust method is not as pure as that collected by the drainage method because the relative molecular mass of oxygen is 32 while the average relative molecular mass of air is 29The two are similar, and when collecting by the exhaust method, it is easy to cause the air to be exhausted due to surrounding disturbances, and impurities in the air to be mixed into the oxygen. Compared with the exhaust method, the oxygen collected by the drainage method is relatively pure, because the solubility of oxygen in the water is very small, which will not affect the collection, and it is easier to determine whether the collection is full.

The disadvantage of the drainage method is that the operation is more troublesome, but considering the effect of the experiment, it is better to use the drainage method.

Upward exhaust air method. Oxygen is denser than air, so the only way to exhaust air is to use it.

Since oxygen is denser than air, oxygen can be collected by placing the cylinder on the table and using a long catheter to introduce oxygen to the bottom of the cylinder. When collecting gases that are significantly denser than air, the upward air exhaust method is used; When collecting gases that are significantly less dense than air, the downward air exhaust method is used.

Introduction to the upward exhaust air method:

The upward air exhaust method is to introduce the gas and then expel the air upwards, which is usually used when the density of the gas is greater than the density of the air, such as oxygen.

Downward air exhaust method: As the name suggests, it is to exhaust the air downward after the gas is introduced. It is usually used when the density of the prepared gas is less than the density of air, such as ammonia. Exhaust gas collection is the collection of gases that are easily soluble in water and do not react with components in the air, especially oxygen.

It should be said that hail is "whether the oxygen collected by the upward exhaust air method is purer or drier", because the density of oxygen is greater than that of air, and it cannot be collected by the downward air method.

In addition, the oxygen collected by the exhaust method is not as pure as the exhaust method, because oxygen is a part of the composition of the air and is easy to gather with the oxygen in the air to grind sails; The oxygen collected by the drainage method is slow to dissolve with the water, and no other gas enters, so the oxygen collected by the exhaust method is not as pure as the oxygen collected by the drainage method.

Oxygen has combustion, can support combustion, and can rekindle the wooden strip with sparks, so the upward air exhaust method is used.

Oxygen collection method: Put the wooden strip with sparks in the eggplant circle at the mouth of the gas collection bottle, if it rekindles, the trembling code collapses to indicate that the collection is full

Therefore, the answer is: put the wooden strip with Mars in the mouth of the cylinder mold, if it rekindles, it means that the collection is full