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