how to write teacher diary in english pdf download class 9th

 How to write diary for class 10th,9th in English

In today's article, we will discuss class 9th science lesson 3 how to prepare a teacher diary, which we will understand in detail.

First of all, we will discuss Class 9th subject Science Chapter 3 

'Atoms and Molecules

In this chapter, what were the Indian scientists' ideas about matter? We get information in the first paragraph about how the atoms were named. As a teacher, it becomes important to enlighten your children about these efforts of Indian scientists.

After reading this article, how do you make a teacher diary for a science subject, you can easily prepare a teacher diary on topics related to atomic and atomic structure.

The Laws of Chemical Combination:

The Law of Chemical Combination by Anthony L. Lavoisier (Antonie L. Lavoisier) and Joseph L. Proust (Joseph L. Proust) propounded.

There are two laws of chemical combination:

1. LAW OF CONSERVATION OF MASS

According to the law of conservation of mass, we can neither create nor destroy mass.

2. LAW OF CONSTANT PROPORTIONS

According to this law, "the elements in any compound are always present in a definite proportion by mass."

Let's see what Dalton says about the atom

According to Dalton's atomic theory, all

substance, whether an element, a compound or

A mixture is made up of small particles called

Nuclear. The postulates of this theory can be

It is stated as follows:

(i) All matter is made up of very fine particles

called atoms, which participate in

chemical reaction.

(ii) Atoms are indivisible particles, which

cannot be created or destroyed in

chemical reaction.

(iii) Atoms of a given element are identical

in mass and chemical properties.

(iv) occurs in atoms of different elements

various mass and chemical

Property.

(v) Atoms are small. coincide in the ratio of

Whole numbers to form compounds.

(vi) Relative numbers and types

Atoms are stable in a given

mix.

What is a Molecule?

A molecule is in general a group of two or

more atoms that are chemically bonded

together, that is, tightly held together by

attractive forces. A molecule can be defined as

the smallest particle of an element or a

compound that is capable of an independent

existence and shows all the properties of that

substance. Atoms of the same element or of

different elements can join together to form

molecules.

WHAT IS AN ION?

Compounds composed of metals and nonmetals contain charged species. The charged

species are known as ions. Ions may consist

of a single charged atom or a group of atoms

that have a net charge on them. An ion can be

negatively or positively charged. A negatively

charged ion is called an ‘anion’ and a

positively charged ion, a ‘cation’. 

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no	Teaching point/Activities
1	In this chapter, students will understand the structure of every substance in this world and learn the importance of atoms.
2	The law of chemical combination will be understood in detail, students will be able to know both the given law with examples.
3	The students will be able to understand how mass obeys the law of conservation.
4	To understand the law of conservation of mass, the example given in the tax book will be shown to all the students in a practical way, so that the students will understand it in detail.

Extra knowledge

How does mass remain in a compound?

Elements are always present in a pure chemical compound

at a certain ratio by mass. This is known as the law of

fixed ratio.

What is an atom?

• Atom is the smallest particle of an element that cannot

usually exist independently and retain all their chemicals

Property.

What do you understand by atom?

• Molecule is the smallest particle of an element or compound

Capable of independent existence under normal conditions.

It shows all the properties of matter.

• The chemical formula of a compound shows its constituents

elements and the number of atoms of each combining element.

What is an ion?

• Groups of atoms that act as ions are called polyatomic ions.

There is a fixed charge on them.

• The chemical formula of a molecular compound is determined

by the valency of each element.

• In ionic compounds, the charge on each ion is used

Find the chemical formula of the compound.

by the author

You write from the teaching point given in the article in your teacher's diary and explain to the headmaster of your school that this topic is very important in this chapter.