"Oxygen" The air around us PPT (Lesson 1)

Description

"Oxygen" The air around us PPT (Lesson 1), 25 pages in total.

new knowledge learning

Knowledge point 1: Analysis of ideas for preparing gaseous substances in the laboratory

1. Determine the ______________ of the gas produced in the laboratory, that is, under laboratory conditions (such as normal temperature, heating, adding catalysts, etc.), what drugs can be used and what reactions can be used to produce this gas.

2. It is necessary to study the _________ used to produce gas, including the ____________ and ____________ of the gas.

3. It is necessary to study how to verify that the gas produced is the gas to be produced.

Interactive exploration

Research point 1: Producing oxygen in the laboratory

[Question Research] As shown in the figure, oxygen can be obtained through four ways. What do you think can be used as a reactant for producing oxygen in the laboratory?

[Inductive improvement] When preparing a gas in the laboratory, you must first select the reactants, know how to control the reaction conditions, then determine the gas generation and collection devices, and finally review whether the entire reaction system meets the requirements Environmental protection and safety requirements. To produce oxygen, the reactants must contain oxygen. It is also necessary to consider whether the raw materials are easy to obtain, whether the experimental conditions are easy to control, whether the experimental device is easy to assemble, and whether the experimental operation is safe and reliable. The liquid air separation method is suitable for mass production of oxygen. It is an industrial method for producing oxygen and is not suitable for use in laboratories. Potassium permanganate and potassium chlorate can produce oxygen after heating and can be used to produce oxygen. Hydrogen peroxide can produce oxygen. No heating is required, and the products are water and oxygen, which meets the requirements of green chemistry and can be used to produce oxygen.

Class feedback

Knowledge point 1: Producing oxygen in the laboratory

1. From the aspects of safety, environmental protection, energy saving, simplicity, etc., the best way to prepare oxygen in the laboratory is ()

A. Electricity causes water to decompose: water → electricity hydrogen + oxygen

B． Catalytic decomposition of hydrogen peroxide: hydrogen peroxide → manganese dioxide water + oxygen

C． Potassium permanganate is decomposed by heating: Potassium permanganate → Heating potassium manganate + manganese dioxide + oxygen

D． Potassium chlorate is heated to decompose: Potassium chlorate → Manganese dioxide is heated to potassium chloride + oxygen

2. Among the following experimental devices for the preparation, collection, and temporary storage of O2, which one is correct ()

A. ②④⑤B. ②④⑥

C. ①⑤⑥ D. ②③⑤

Knowledge Point 2 Catalyst

3. Which of the following statements about catalysts is incorrect ()

A. The quality and chemical properties of the catalyst remain unchanged before and after the chemical reaction.

B. Catalysts can increase the rate of certain chemical reactions

C. Catalysts can reduce the rate of certain chemical reactions

D. Any chemical reaction requires a catalyst

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

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Update Time: 2024-11-25

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

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