"Air and Oxygen" PPT courseware

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"Air and Oxygen" PPT courseware

Part 1: Composition of air

1. Prove that the air contains carbon dioxide: -----Air can make clear lime water turbid.

2. Proof that there is water vapor in the air: -----When ice is placed in a cup, water droplets appear on the wall of the cup.

-----Anhydrous copper sulfate turns blue when placed in the air.

3. Prove that the air contains oxygen:

-----Combustibles burn in the air.

think:

How to determine the volume fraction of oxygen in air?

Tips: 1. Oxygen in the air will support combustion;

2. If solid is formed after oxygen-assisted combustion, the air pressure in the bottle will decrease;

3. Use the conversion method to measure measurements that are difficult to measure directly.

Air and Oxygen PPT, Part 2: Key to the success of the experiment:

(1) The device cannot leak (check the air tightness)

(2) Add a small amount of water to the gas collecting bottle (to cool down and absorb harmful white smoke)

(3) Red phosphorus should be excessive (to fully react with oxygen)

(4) Wait until the device cools down before opening the water stop clamp.

(5) After igniting the red phosphorus, immediately put it into the bottle and tighten the stopper.

In the experiment, if the volume of water entering is less than 1/5 of the total volume of the gas collecting bottle, what are the possible reasons?

(1) The device is leaking;

(2) Insufficient amount of red phosphorus;

(3) Open the water stopper before cooling to room temperature...

Air and Oxygen PPT, Part 3: Classroom Exercises:

1. Calculated by volume, the most abundant gas in the air is ( )

A. Oxygen B. Nitrogen

C. Carbon dioxide D. Rare gases

2. The volume of oxygen in 100 liters of air is approximately ( )

A. 78 liters B. 78% C. 21 liters D. 21%

3. The volume ratio of oxygen to nitrogen in the air is approximately ( )

A, 4:1 B, 1:4 C, 1:5 D, 5:1

4. Do you have any other methods to measure the volume fraction of oxygen in the air?

Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume free download, air and oxygen PPT download, .PPT format;

For more information about the "Air and Oxygen" PPT courseware, please click on the Air and Oxygen PPT tab.

"Air and Oxygen" PPT download:

"Air and Oxygen" PPT Download Part One: Preparing Oxygen in the Laboratory 1. Steps to produce oxygen using hydrogen peroxide (hydrogen peroxide): 1. Check the air tightness of the device; 2. Add MnO2 to the flask; 3. Connect the device; 4. Add H2O2 to the separatory funnel; 5..

"Air and Oxygen" PPT:

"Air and Oxygen" PPT Part One: Properties of Oxygen 1. Observe the color and state of a bottle of oxygen. 2. Gently fan the mouth of the bottle with your hand to let a small amount of oxygen float into your nostrils and smell its smell. Oxygen is a ____color____odorous gas. Smell...

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Update Time: 2024-11-22

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