"Laboratory Preparation and Properties of Oxygen" Air Around Us PPT Courseware 7

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"Laboratory Preparation and Properties of Oxygen" Air Around Us PPT Courseware 7

What methods and equipment are used in the laboratory to produce oxygen?

Please read the textbook P45-P46 to understand the method of producing oxygen in the laboratory. Read according to the outline below.

Oxygen laboratory preparation method

principle of reaction

Drug (the status of the drug)

reaction conditions

literal expression for reaction

device that takes place

instrument

Type of device

Collection method (drainage method? Or air exhaust method?)

Inspection methods and fullness verification methods

1. Heating potassium permanganate to produce oxygen

1.Potassium permanganate---potassium manganate+manganese dioxide+oxygen

device for producing gas

Including generating device and collection device.

(1) Principles for selecting generators

Basis for selection: According to the state of the reacting substances and reaction conditions (whether to heat or not)

(2) Selection ideas for gas collection devices:

Selection basis: water solubility and density of gas (ratio to air),

⑴. Drainage and gas collection method

Scope of application

Gases that are not easily or poorly soluble in water

advantage

①Easy to collect relatively pure gas

②Easy to observe whether the gas has been fully collected

shortcoming

①The collected gas is relatively humid

②Not as convenient as the air exhaust method

⑵.Upward air exhaust method

Scope of application

A gas that is denser than air

advantage

①The collected gas is relatively dry

②The operation is relatively simple and convenient

shortcoming

①The collected gas may be impure

②It is difficult to judge whether the gas collection is full

【Classroom Exercise】

【1】The steps for preparing potassium permanganate in the laboratory and collecting oxygen by drainage method are as follows. Please arrange them in the correct order:

1. Load medicines

2. Fix the test tube so that the test tube is slightly tilted downwards

3. Check the air tightness of the device

4. Preheat and heat

5. Collect oxygen

6. Turn off the alcohol lamp

7. Take out the air tube from the sink

2. When preparing oxygen in the laboratory, the mouth of the large test tube containing drugs should be ( )

(A) Down (B) Up

(C) Slightly inclined downward (D) Slightly inclined upward

3. When the laboratory uses the drainage method to collect oxygen, the air guide tube needs to be extended into a gas collecting bottle filled with water. This operation should be done in ( )

(A) Before heating solid pharmaceuticals

(B) Simultaneously with heating solid drugs

(C) When bubbles begin to release

(D) When bubbles are released continuously and evenly

Operation:

Please use text expressions to express the chemical changes of the following substances.

1. Combustion of sulfur

2. Combustion of red phosphorus

3. Burning of wire

4. Burning of charcoal

5. Produce oxygen from hydrogen peroxide

6. Heating potassium chlorate and manganese dioxide to produce oxygen

7. Heating potassium permanganate to produce oxygen

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Update Time: 2024-11-21

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 1 industry PPT template

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