"Composition of Air" Air around us PPT

Description

"Composition of Air" PPT of the air around us, 18 pages in total.

1. Course introduction

Something is everywhere,

You can't drive it away with a stick,

The eyes cannot see,

There is no hand model either.

Chewing has no taste,

Can't live without it.

2. Introduction to new courses

1. Understand the composition of air

Air has long been thought to be a single-component substance. Until 1775, French chemist Lavoisier heated mercury in a closed container and concluded that air is composed of oxygen and nitrogen, with oxygen accounting for about one-fifth of the total volume of air.

2. Determine the oxygen content in the air

1. Ideas for measuring the oxygen content in the air:

Idea 1: Use drugs to remove oxygen through chemical reactions, and the reduced volume is the volume of oxygen.

Idea 2: Use drugs to remove other gases through chemical reactions, leaving only oxygen, and measure the volume of oxygen.

2. Experimental principle

When copper is heated, it reacts with oxygen in the air, causing the gas in the closed container to decrease and the pressure to decrease. Thus, the volume of the reduced gas in the device after the experiment is measured, which is the volume of oxygen in the air.

3. Practice in class

1. The gas with a volume fraction of about 21% in the air is ( )

A. Nitrogen B. Oxygen C. Carbon dioxide D. Rare gas

2. The following scientists have made great contributions in the history of the development of chemistry. The scientist who experimentally concluded that air is composed of nitrogen and oxygen in the 18th century is ( )

A. Dalton B. Mendeleev C. Lavoisier D. Scheler

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

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

4. Class Summary

Through the study of this lesson, we know that air is a mixture of nitrogen, oxygen, rare gases, carbon dioxide and other gas impurities. The volume content of nitrogen is 78%, the oxygen content is about 21%, the argon content is 0.934%, the carbon dioxide content is 0.033%, and other gas impurities are 0.002%. Understand the experimental device, experimental principles and experimental procedures for measuring oxygen content in the air.

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 Around Us PPT Composition of the Air PPT tab.

"Composition of Air" PPT courseware of the air around us:

"Composition of Air" PPT courseware on the air around us, 24 pages in total. Summary: Understand the composition of air. Air is an important resource. Pay attention to air quality... Learning objectives: 1. Understand the composition of air; 2. Understand the importance of air and master oxygen...

"Composition of Air" Air Around Us PPT Lesson (Lesson 2):

"Composition of Air" PPT lesson on the air around us (Lesson 2), 24 pages in total. New Knowledge Learning Knowledge Point 1 Air is an important resource 1. Separation of various components in the air Liquid air separation method In industry, the air is liquefied by cooling and pressurizing, and then...

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

"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 components: ______ (N2) about 78%, oxygen (O2) about _____. Secondary ingredients: ________..

File Info

Update Time: 2024-10-02

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

Preview