"Classification of Matter" PPT courseware

Description

"Classification of Matter" PPT courseware

Part One: Classification Methods

There are many ways to classify substances. According to research needs, substances can be classified from multiple perspectives and get different classification results (the same substance belongs to different categories). Therefore, when classifying substances, the basis for classification must be specified.

In order to facilitate the study and grasp of the properties of substances, people classify substances according to certain classification standards. Commonly used classification methods are ___________ and ___________.

Feature reminder

Pay attention to two points when classifying oxides:

(1) Metal oxides are not necessarily alkaline oxides, such as Na2O2

Oxides, Al2O3 is an amphoteric oxide, and Mn2O7 is an acidic oxide.

(2) Non-metal oxides are not necessarily acidic oxides, such as CO, NO, NO2, etc.

Classification of substances PPT, part 2 content: "Thinking·Perception"

Are substances composed of the same elements always pure?

[Tips]Not necessarily. For example, a gas composed of O2 and O3 only consists of one oxygen element, but it is a mixture.

1. Classify pure substances according to their different physical properties, such as color, state, smell, hardness, density, solubility, etc.

Observe the substances in the picture and classify them according to their color and state.

2. Pure substances can be classified according to their different compositions and uses.

There are eight kinds of pure substances such as oxygen, ferric oxide, hydrogen chloride gas, sulfur, water, zinc sulfate, magnesium, and mercury. They are classified from the perspective of elemental composition. What are the pure substances composed of the same elements and different elements?

Elements and compounds:

(1) Pure substances can be divided into two categories: elemental substances and compounds according to their different elemental compositions.

(2) Element: a pure substance composed of one element.

Such as: O2, N2, Fe, S, etc.

A.Characteristics: ①Composed of the same elements ②It is a pure substance

B. Judgment basis:

①First determine whether it is a pure substance

②Whether it is composed of one element

Compounds can be divided into inorganic compounds and organic compounds according to whether they contain carbon elements in their composition.

inorganic compounds

A. Definition: Compounds composed of elements other than carbon.

B. Composition characteristics: generally does not contain carbon (except for carbon oxides, carbonic acid and carbonates)

C. Note: A few carbon-containing compounds such as CO, CO2, H2CO3, and carbonates are inorganic compounds.

organic compounds

A. Definition: Carbon-containing compounds.

B. Composition characteristics: Must contain carbon element.

C.Chemical properties:

① It is flammable and generates CO2 and H2O when burned.

②Easy to carbonize when heated: Black carbon is generated when heated or incompletely burned.

Classification of substances PPT, part three content: exploration:

Experimental methods can be used according to the characteristics of known substances and unknown substances, such as color, state, odor, solubility, flammability, etc. Substances can also be classified through comparison.

For the identification of unknown substances, because unknown substances may be toxic, corrosive, etc., it is strictly forbidden to use hands to grasp them, put your nose to the mouth of the container to smell them, let alone taste them!

be careful:

(1) Metals must be able to conduct electricity and heat, but the element that can conduct electricity and heat is not necessarily metal. Non-metallic graphite can also conduct electricity and heat.

(2) Metals are generally solid at room temperature, except for mercury which is liquid. Non-metals are generally in gaseous or solid state at room temperature, except for bromine which is liquid.

Keywords: Zhejiang Education Edition ninth grade science PPT courseware free download, classification of substances PPT download, .PPT format;

For more information about the "Classification of Substances" PPT courseware, please click on the "Classification of Substances" ppt tag.

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Update Time: 2024-09-17

This template belongs to science courseware Zhejiang Education Edition Ninth Grade Science Volume 1 industry PPT template

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