Introduction to Chemistry
What is Science?
The knowledge that provides understanding of this world and how it works, is called science.So, Basically science is a knowledge.
What kind of knowledge?
Every knowledge that tells us about this world.Like what is in it and how it works.
This knowledge can be divided as the branches of science.
Science ilm ha. ab sawal ye peda hota ha k konsa ilm? Science kesa ilm ha? Science ek aasa ilm ha jo hme is duneya ko smjne me madad deta ha k ye duneya kya ha or kis trha chal rhi ha.
Science k is ilm ko bhtr treke se smjne k liay hm is ilm ko 3 branches me takseem kr skte hn.
Branches of Science:-
The knowledge of science is divided into following three branches.
1.Chemistry
2.Biology
3.Physics
Now we will discuss about the knowledge of chemistry.
Chemistry:-
It is the branch of science which deals with the study of composition, structure, properties and chemical reactions of matter.
As we know that chemistry is a branch of science.So,it means that chemistry is also a knowledge just like science. Now the question is,
What kind of knowledge is chemistry?
Chemistry is the study of composition, structure, properties and chemical reactions of matter.
Chemistry, science ki ek branch ha. Is ka mtlb ha k science ki trha chemistry b ek ilm ha. To chemistry kis trha ka knowledge ha? Chemistry me hm kya study krte hn?
Chemistry me hn matter ki composition, uska structure, or properties or akir me chemical reactions ko study krte hn.
To understand chemistry we have to know the following:-
•Composition:-
Composition is basically the components of different compound that which components are used to make a compound.
For example:- Methane (CH4) is a compound and carbon and hydrogen are its components which are combined to form methane. So,we can say that carbon and hydrogen are the composition of methane.
Matter ki composition ka kya mtlb ha? Composition basically components ko khte hn mtlb k kitne or konse components mil kr ek compound bnate hn ye us compound ki composition ho gi.
For Example:- Methane (CH4) ek compound ha jis me 1 carbon atom or 4 hydrogen k atoms hn. 4 Hydrogen or 1 Carbon mil kr methane ka 1 compound bnate hn. To hm kh skte hn k yhi hydrogen or carbon methane k components hn.
•Structure:-
Every compound has its unique molecular formula and a structural formula.
For example:- CH2 is the molecular formula of methene and H=C=H is its structural formula.Which shows the position of every element present in the compound.
Kisi b compound ka formula 2 trha se likha ja skta ha 1 ko molecular formula bolte hn or dusra structural formula. Molecular formula k zreay ye btaya jata ha k compound me kitne or kon kon se elements majood hn. jb k structural formula me, kon kon sa element kis kis jga pr kis kis element k sath attach ha or un k drmeyan kitne bond majood hn, ye sb show kiya jata ha. jesa k uper example me btaya gya ha.
•Properties:-
Every element and compound have its unique physical and chemical properties, in chemistry we have to know these properties.
Elements ya compounds ki properties 2 trha ki hoti hn. Chemical properties or physical properties. Chemical properties me element ya compound k chemical behavior ko show kiya jata ha jb k physical properties us element ya compound ki physical state pr depend krti hn.
•Chemical Reactions:-
When any chemical species like element or compound reacts with some other element or compound to form a new product, this process of converting of reactants into product is called a chemical reaction.
Jb 2 ya 2 se zyada elements ya compounds chemically combine krte hn to wo 1 new compound bnate hn. milne wala elements ko reactants bolte hn or jo new substance bnta ha use product bolte hn. or in reactants k product me convert hone k process ko chemical reaction bolte hn.
Now, May be you know that what the knowledge of chemistry is for.
Written By:- M.Ashir Azeem
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