The steps of hydrogen peroxide to produce oxygen, the method of hydrogen peroxide to produce oxygen?

Catalytic decomposition of hydrogen peroxide solution (the catalyst is mainly manganese dioxide, ferric oxide, copper oxide can also be):

Explanation: 1. The experiment first checks the air tightness, and the test tube is tilted evenly after heating: "test tube tilting" means that when installing a large test tube, the test tube should be slightly tilted, that is, the test tube mouth should be lower than the bottom of the test tube, so as to prevent the small amount of water contained in the drug from turning into water vapor when heating, and condensing into water droplets at the nozzle and flowing backwards, resulting in the rupture of the test tube.

"Evenly heated" means that the test tube must be heated evenly when heated.

2. Commonly used drainage method for collection: It means that when collecting oxygen, it should be collected by drainage and gas collection method.

3. Remove the catheter first and then move the lamp: It means that when stopping the production of oxygen, be sure to withdraw the trachea from the sink first, and then remove the alcohol lamp (if the alcohol lamp is removed first, the water will be sucked along the catheter into the hot test tube due to the decrease in temperature and air pressure in the test tube, resulting in the rupture of the test tube due to rapid cooling).

1 Place manganese dioxide in a test tube

2 Insert a double-hole rubber plug at the mouth of the test tube, insert a separating funnel in one hole, and insert a trachea in one hole (check the air tightness at this time).

3 Pour hydrogen peroxide into a funnel and control the reaction speed with a separating funnel 4 According to the physical properties of oxygen, collect oxygen by draining downward

Check the airtightness of the device before connecting the device and starting to add medicine.

Connecting device - dosing - gas production - checking that oxygen collection is full - withdrawing device (first remove the catheter).

How to decompose hydrogen peroxide to produce oxygen.

Chemistry Experiments and Reflections 18: Hydrogen Peroxide to Oxygen - Yongsheng Chemistry House.

Experimental principle of hydrogen peroxide to oxygen: hydrogen peroxide (H2O2) - water (H2O) + oxygen (O2).

Specific steps for hydrogen peroxide to produce oxygen:

Connecting devices. Check the airtightness of the device.

Then fill the Erlenmeyer flask with manganese dioxide.

Pour in hydrogen peroxide solution.

Collect oxygen. Precautions for hydrogen peroxide to produce oxygen:

The separating funnel can be replaced with a long-neck funnel, but its lower end should extend below the liquid surface to prevent the generated gas from escaping from the long-necked funnel;

The catheter only needs to be slightly inserted into the tube plug.

Air tightness check: close with a water stop clip, open the piston of the separating funnel, add water to the funnel, and the water level does not continue to fall, indicating that the air tightness is good.

When filling medicines, fill solids first and then liquids.

Advantages of the device: the start and end of the reaction can be controlled, and liquids can be added at any time.

Summary of hydrogen peroxide to oxygen:

If the solid (or solid + solid) is heated to generate gas, the potassium permanganate oxygen production device is selected;

If the gas is produced at room temperature of solid + liquid, hydrogen peroxide is used to produce oxygen.

Catalyst: A substance that can change the reaction rate of other substances in a chemical reaction, but its chemical properties and mass do not change before and after the reaction.

The long-necked funnel is filled with hydrogen peroxide, and the lower end of the long-necked funnel should be sealed, that is, submerged in the water of the Erlenmeyer flask, and the Erlenmeyer flask is filled with manganese dioxide and water.

When charging, it is first filled with solid and then liquid.

When the air bubbles in the gas collector cylinder overflow, it means that the oxygen in the gas collector cylinder has been collected.

Hydrogen peroxide can be slowly decomposed to produce oxygen and water at room temperature, and the reaction can be accelerated after heating or adding catalysts such as manganese dioxide, copper sulfate, hydrogen iodide, iron oxide, ferric chloride, etc.

1. Withdrawal method.

The chemical formula of hydrogen peroxide is H2O2, pure hydrogen peroxide is a light blue viscous liquid, which can be miscible with water in any proportion, and is a strong oxidizing agent. Its aqueous solution is suitable for medical wound disinfection, environmental disinfection and food disinfection. In general, it will slowly decompose into water and oxygen, but the decomposition rate is extremely slow, and the way to speed up the reaction is to add catalysts such as manganese dioxide or irradiate it with short-wave rays.

2. Formula. 1) 50g+ mass conservation).

2) Let the mass fraction of h2g2 be x

2 h2o2===mno2===2h2o+o2↑34g 32g

50*x solution gives x=

According to the specific problem type, the steps are disassembled, the cause is analyzed, the content is expanded, etc.

The specific steps are as follows: The main reason for this is ......

From the equation of Liang Zhengzhi, it can be seen that oxygen is a gas rubber compound.

1 Place manganese dioxide in a test tube

2 Insert a double-hole oak plug at the mouth of the test tube, insert a separating funnel in one hole and a trachea in one hole 3 Pour hydrogen peroxide into the funnel and use the separating funnel to control the reaction speed 4 According to the physical properties of oxygen, collect oxygen by downward drainage

Methods for producing oxygen in junior high school laboratories:

The reactant is: hydrogen peroxide.

Reaction conditions: manganese dioxide and other catalysts, the effect is to accelerate the decomposition rate of hydrogen peroxide.

Product: Oxygen and water.

The equation is: 2 molecules of hydrogen peroxide are decomposed into 2 molecules of hydrogen and 1 molecule of oxygen under the action of a catalyst such as manganese dioxide.

Experimental drugs: 3% hydrogen peroxide solution, small wooden strips, manganese dioxide solids.

Experimental Procedure:1Add a small amount of hydrogen peroxide solution to the test tube, put a small wooden strip with sparks on the mouth of the test tube, and observe that there is no obvious phenomenon.

2.A small amount of manganese dioxide was added to the test tube, and the observed phenomenon was that a large number of bubbles appeared and the wooden strips re-ignited.

3.When the formation of bubbles is stopped, the hydrogen peroxide solution is continued to be added, and the phenomenon is observed: a large number of bubbles appear, and the wood strips re-ignite. It can be concluded that hydrogen peroxide produces oxygen in the presence of a catalyst.