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"Laboratory Preparation and Properties of Oxygen" Air Around Us PPT Courseware 4
1. Heating potassium permanganate to produce oxygen
1. Experimental purpose: To prepare oxygen and explore the properties of oxygen
2. Experimental principle:
3. Instruments and medicines:
Iron stand, iron clamps, test tubes, single-hole rubber stoppers, air tubes, gas bottles, glass pieces, sinks, alcohol lamps, matches, cotton, potassium permanganate (KMnO4).
2. Competition and experiment
Competition: See which group does it quickly and standardly!
3. Experience the properties of oxygen
Next is the moment to witness the miracle!
Activity 1: Sulfur burns in oxygen:
Activity 2. Thin iron wire burns in oxygen
[Textbook P46 Questions and Communication]
1. When testing the air tightness of a device, besides holding it tightly with your hands, what other methods can be used?
Analysis: Cover the test tube with a hot towel; put the test tube into a large beaker filled with warm water; heating with an alcohol lamp can also be used, but is usually rarely used.
2. If the oxygen produced by a student is impure, what do you think are the possible reasons?
Analysis: When draining and collecting gas, the gas collecting bottle is not filled with water, leaving bubbles; the oxygen collection begins before the air in the device is exhausted; after collecting the gas, the glass piece and the mouth of the gas collecting bottle are sealed not good.
3. When inserting red-hot charcoal into a gas collecting bottle containing oxygen, why should it be inserted slowly from the mouth of the bottle downwards?
Analysis: If you start to put red-hot charcoal into the bottom of the gas collecting bottle containing oxygen, the charcoal will burn in the oxygen and release a lot of heat and produce carbon dioxide, which will easily cause the oxygen in the gas collecting bottle to escape and cause losses, which will occur quickly. It reduces the oxygen content in the bottle and affects the experimental phenomena.
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"Laboratory Preparation and Properties of Oxygen" PPT Courseware 4:
"Laboratory Preparation and Properties of Oxygen" PPT Courseware 4 Experimental Purpose 1. Learn the method of producing oxygen in the laboratory. 2. Deepen your understanding of the properties of oxygen. Experimental supplies 1. Equipment: large test tube, single-hole rubber stopper, rubber tube, glass tube, gas bottle, sink, iron frame...
"Laboratory Preparation and Properties of Oxygen" PPT Courseware 3:
"Laboratory Preparation and Properties of Oxygen" PPT courseware 3 1. Producing oxygen by heating potassium permanganate 1. Experiment purpose: Preparing oxygen and exploring the properties of oxygen 2. Experimental principle: 3. Instruments and medicines: iron stand, Iron clamps, test tubes, single-hole rubber stoppers, air tubes, collection...
"Laboratory Preparation and Properties of Oxygen" PPT Courseware 2:
"Laboratory Preparation and Properties of Oxygen" PPT Courseware 2 Learning Objectives 1. Practice the method of producing and collecting oxygen in the laboratory. 2. Verify the chemical properties of oxygen by burning charcoal and iron wire. Pre-study tutorial 1. Prepare experimental instruments and drugs, iron stand (with iron clamps), test tubes...