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Authoritative PPT Summary
"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 components in the air - liquid air separation method
In industry, the air is liquefied by cooling and pressurizing, and then the liquid air is heated, and the different boiling points of oxygen, nitrogen, and rare gases in the air are used to separate them one by one from the air.
[Explanation] The _________ with a lower boiling point (-196 ℃) evaporates first, and the remainder is mainly a light blue liquid ____________ (-183 ℃) with a higher boiling point, which is stored for use.
2. Purposes of various components in the air
(1) Oxygen can supply biological ________, support fuel ________, and can also be used in steel ________ and metal ________, etc.
(2) Nitrogen is an important raw material for industrial production of _______ and _______ (such as ammonium bicarbonate, urea, etc.); filling food packaging bags with nitrogen can extend the _______ of food; liquid nitrogen is a good ________, Can be used to refrigerate blood, etc.
Interactive exploration
Exploration Point 1 Air is an important resource
[Question Research] As shown in the picture, what properties of oxygen, nitrogen, and helium are used respectively?
[Induction promotion]The use of matter is determined by its properties. The properties of each gas component in the air determine their important uses. The chemical properties of oxygen are relatively active and can provide breathing and support combustion; nitrogen and rare gases are generally inactive in chemical properties and can usually be used as protective gases.
Class feedback
Knowledge point 1: Air is an important resource
1. Which of the following statements about air is correct ()
A. Air is a pure substance
B. Nitrogen in the air can be used as raw material for the production of nitrogen fertilizer
C. Noble gases in the air have no use value
D. Oxygen in the air supports combustion, so oxygen is a common fuel
2. Air is an important resource. The information available according to Figure 17-1 is ()
A. Oxygen can supply breathing
B. Oxygen can support combustion
C. Nitrogen is a good refrigerant
D. Rare gases can be used to make electric light sources
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 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: ________..
"Composition of Air" PPT of the air around us:
"Composition of Air" PPT of the air around us, 18 pages in total. 1. Course introduction: There is something everywhere, you can’t drive it away with a stick, you can’t see it with your eyes, and you don’t have a hand model, it has no taste when you chew it, and you can’t live without it. ... ... ... 2. Explanation of the new lesson 1. Understand the air..