"Identifying the Elemental Composition of Matter" PPT courseware on the composition of air and matter

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"Identifying the Elemental Composition of Matter" PPT courseware on the composition of air and matter

1. What is an element?

——The general name for a type of atoms with the same nuclear charge (i.e. the number of protons)

For the convenience of writing and academic communication, internationally unified symbols are used to represent various elements.

2. How to express the names and symbols of elements

element symbol

Internationally, the first letter of the element's Latin name is used to represent an element;

When the Latin names of several elements have the same first letter, a lowercase letter is appended.

Such as: H, He; C, Cl

Writing element symbols

The first letter should be uppercase and the second letter should be lowercase (if any).

Read it, think about it, and try your abilities:

①What is an element?

②Are the atoms of different elements the same?

③What is the difference between elements and atoms?

④How do we represent elements? What issues should you pay attention to when writing?

Give it a try, have you learned it?

Indicate the meaning of the following symbols:

① O ② Na ③ C ④ S

Give it a try and you will gain new insights!

Represented with symbols:

①Five carbon atoms ②Two iron atoms

③n magnesium atoms ④One nitrogen atom

3. Elements and compounds

Think about it, what elements are the following substances made of?

Hydrogen H2 Oxygen O2 Sulfur S Iron wire Fe Argon Ar

Water H2O Carbon dioxide CO2 Iron tetroxide Fe3O4 Sodium chloride NaCl

Potassium permanganate KMnO4 Calcium carbonate CaCO3

Basic copper carbonate Cu2(OH)2CO3

Go out and migrate. Have your abilities really improved?

1. Among the following element symbols and names, which one is correct?[ ]

A. Iodine i B. Mercury Hg C. Iron FE D. Neon Na

2. “2H” means ����������[ ]

A. Two hydrogen atoms B. One hydrogen molecule

C. Hydrogen element D. Hydrogen gas

3. In daily life, we often drink mineral water. The picture on the right is a partial trademark picture of a certain drinking mineral water, which lists the physical and chemical indicators.

(1) The calcium, magnesium, potassium and sodium here refer to ���—[ ]

A. Element B. Atom C. Molecule D. Element

(2) The mineral water belongs to ��������—[ ]

A. Pure substance B. Element C. Compound D. Mixture

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For more information about the PPT courseware "The Composition of Air Substances and Identifying the Elemental Composition of Substances", please click the "Composition of Air Substances ppt Identifying the Elemental Composition of Substances" ppt tag.

"Identifying the Elemental Composition of Matter" The composition of air and matter PPT courseware 2:

"Identifying the Elemental Composition of Matter" PPT Courseware 2 on the Composition of Air and Matter Discussion What do the compositions of the molecules of the above substances have in common? The molecules of these substances all contain ____ atoms, which are atoms of the ____ element. The particles of these substances contain ____ atoms,...

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Update Time: 2024-07-03

This template belongs to Chemistry courseware Cantonese Education Edition Ninth Grade Chemistry Volume 1 industry PPT template

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