"Composition of Air" Air Around Us PPT Lesson (Lesson 1)

Description

"Composition of Air" PPT lesson on the air around us (Lesson 1), 17 pages in total.

new knowledge learning

Knowledge point 1: Composition of dry clean air (volume fraction)

1. Main ingredients: ______ (N2) about 78%, oxygen (O2) about _____.

Minor components: ____________ about 0.934%, carbon dioxide (CO2) about ________, other gases about ________.

Interactive exploration

Explore point 1: Composition of air

[Question Research] Based on life experience and the above diagram, can you tell what the components of dry and clean air are? Why is air a mixture?

[Inductive improvement] Some substances can burn in the air, indicating that the air contains oxygen; plants perform photosynthesis, indicating that the air contains carbon dioxide; dry biscuits will soften when placed in the air, indicating that the air contains water vapor. There are also nitrogen, rare gases, etc. in the air. It can be seen that air is a mixture of various substances.

Class feedback

Knowledge point 1 Composition of air

1. We cannot do without air every moment. The most abundant gas in the air is ()

A． Oxygen b. Nitrogen c. carbon dioxide D. argon

2. The scientist who uses a balance to conduct quantitative experiments to verify the main components of air is ()

A． Marie Curie b. Hou Debang C. Nobel d. Lavoisier

3. Which of the following statements is wrong ()

A． Compared with copper wire, copper powder reacts with oxygen more easily, making the experimental results more accurate

B. When heated, the gas expands due to heat. In order to prevent the plug from rushing out, the small balloon acts as a buffer.

C． Push and pull the syringe back and forth to ensure full reaction between copper powder and oxygen

D. The amount of copper powder used will not affect the experimental results

Keywords: Free download of Chemistry PPT courseware for the first volume of the ninth grade of the Lujiao Education Edition, PPT download of the composition of air, PPT download of the air around us, .PPT format;

For more information about the PPT courseware "Air Composition of the Air Around Us", please click on the Air Composition of the Air PPT tab.

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Update Time: 2024-11-05

This template belongs to Chemistry courseware Lu Jiao Edition Ninth Grade Chemistry Volume 1 industry PPT template

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