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Its incredible, its meeee

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composition reaction :-when two or more reacts chemically to form a reaction .ex-  c+o=ca2
decomposition reaction when one chemical compound is reacted it forms a single compound . :- ex- 2 h2O+2h2+o2

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2 types of chemical reactions:
1) Chemical decomposition:
Mercuric oxide --(heat)--> Mercury+ oxygen

2) Combination reaction:
Calcium carbonate --(heat)--> Calcuim oxide+ Carbon dioxide

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Deposition.
Heats and creats new substances
Sodium nitrate -------》sodium mitrite + oxygen

Displacement.

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See all the wonderful things oneAboveAll has made

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based on the breakdown of chemical reaction it is classified into type of chemical reaction-
1) chemical composition - reaction where two  or more elements or compounds  reacts to form new production  is chemical composition. ex -  carbon monoxide gas burns with oxygen to form carbon dieoxide .
2) decompistion - reactiosn where two or more elements or compounds breakdowns .
ex- when microorganism breakdown into simple

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Learnt:
Chemical Combination Reaction- When two or more substances react chemically to form one new product only, this reaction which then takes place is known as chemical combination reaction. Ex.-Burning of magnesium, Magnesium+Oxygen----->Magnesium oxide
Chemical Decompositon Reaction- When a single chemical compound decompes on heating oe by some other kind of energy to form two or more new substances.

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Lohith
Hemical reaction is the process in which reactanta get converted into products. :))
Types we learnt :-
We learnt 2 types of chemical reaction , they are as follows :-
Composition reaction :- it is the reaction in which multiple substances are changed into one substance ( in simple definition ) . It has multiple names :- synsthesis reaction , composition reaction , etc magnesium ribbon reaction .

Decomposition reaction:- it is the reaction in which ……………

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1 chemical decomposition
ex. Mercuric oxide on heating strongly decomposes to form  mercury and oxygen

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An acid and a base react with each other

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Types of chemical reaction -
1) Chemical composition or combination reaction - When two or more elements react chemically to form one new product ,the reaction which takes place is called chemical composition.
Ex- Fe + S  heat  FeS
Iron + sulphur ---> iron sulphide

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Types of Chemical reactions – Combination reaction; Decomposition reaction.

Reactions – Combination – Burning Magnesium ribbon
Decomposition – Electrolysis of water

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Type of chemical reactions -
1. Chemical Combination reaction-
When two or more elements or compounds react to form only one new substance. Example - C + O2 = CO2

2. Decomposition reaction -
When a single compound decomposes to into two or more elements.
Example - CaCO3 = CaO + CO2

3. Displacement reaction

4. Double displacement reaction

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combination, decomposition
EXAMPLE:

hdrogen + oxygen ---> water.

iron + oxygen ---> rust.

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1. Combination Reaction
Definition--In a chemical reaction, two or more substances combine to form a new product.
Example--Magnesium+Oxygen--> Magnesium Oxide
2. Decomposition Reaction
Definition-- A substance decomposes in a chemical reaction to form two or more new substances
Example-- Calcium Carbonate-->Calcium Oxide+Carbon Dioxide

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Chemical combination
Chemical Decomposition
Ex)2Mg+o2--------->@MgO
2HgO------->2Hg+o2

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*Chemical combination:
Calcium+carbonate---× calcium carbonate
*Chemical decomposition:
Calcium carbonate----× calcium+carbonate