"Laboratory Preparation and Properties of Oxygen" PPT Courseware 2

Description

"Laboratory Preparation and Properties of Oxygen" PPT Courseware 2

learning target

1. Practice the method of preparing 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 equipment and drugs

Iron stand (with iron clamp), test tube, single-hole rubber stopper, alcohol lamp, sink, gas bottle, glass piece, crucible tongs, rubber tube, conduit, small wooden strips, cotton, matches, potassium permanganate, charcoal, clarification Lime water

2. How to check the air tightness of the device?

Plug the mouth of the test tube tightly with a rubber stopper with a catheter, put the other end of the catheter into the water, hold the wall of the test tube tightly with your hand, and observe if bubbles emerge from the mouth of the catheter in the water. After releasing your hand, the mouth of the test tube forms a section. The water column proves that the air tightness of the device is good.

3. Why should the mouth of the test tube be tilted slightly downward? What is the purpose of stuffing a ball of cotton at the mouth of the test tube?

Prevent the condensed water from flowing back and causing the test tube to burst.

Prevent potassium permanganate powder from entering the duct with the air flow, blocking the duct or entering the sink.

4. Why shouldn’t the catheter in the test tube be stretched too long?

Conducive to gas export

5. Why do you need to preheat the test tube first?

Prevent the test tube from exploding due to uneven heating

1. Prepare three bottles of oxygen

① Check the air tightness of the device;

②Put an appropriate amount of medicine into the test tube and place a ball of cotton at the mouth of the test tube;

③Fix the device on the iron stand;

④Light the alcohol lamp, heat it evenly (preheat) first, and then heat it towards the medicine;

⑤ Collect oxygen (if you use the drainage method to collect it, you need to fill the gas collecting bottle with water before lighting the alcohol lamp, cover it with a glass piece, and place it upside down in the sink);

⑥Move the pipe out of the sink;

⑦ Extinguish the alcohol lamp.

2. Verify the properties of oxygen

1. Reaction of charcoal and oxygen

(1) When inserting red-hot charcoal into oxygen, why should it be inserted slowly from the mouth of the bottle downwards?

Carbon dioxide is denser than air and does not burn or support combustion. The carbon dioxide produced by burning charcoal accumulates at the bottom of the bottle and will extinguish the charcoal.

(2) What are the phenomena of charcoal burning? After the combustion stops, add a small amount of clarified lime water to the gas collecting bottle and shake it. What phenomena can be observed?

①Charcoal produces white light ②Clear lime water turns turbid

(3) Write a literal expression for the reaction between charcoal and oxygen.

2. Oxygen reacts with iron wire

(1) Why should the match be inserted into the oxygen bottle when it is almost burned out?

(2) What is the purpose of pre-filling a small amount of water or sand in the bottle?

(3) Accurately describe the experimental phenomenon and write a text expression of the reaction.

(1) Prevent oxygen consumption

(2) Prevent splashing high-temperature melt from exploding the bottom of the bottle

(3) Burn violently, emit sparks, release a lot of heat, and generate black solid matter

Keywords: Laboratory Preparation and Properties of Oxygen Teaching Courseware, Hunan Education Edition Ninth Grade Chemistry Volume 1 Chemistry PPT Courseware Download, Ninth Grade Chemistry Slide Courseware Download, Oxygen Laboratory Preparation and Properties PPT Courseware Download, .PPT format;

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Update Time: 2024-08-02

This template belongs to Chemistry courseware Hunan Education Edition Ninth Grade Chemistry Volume 1 industry PPT template

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