CHEMICAL REACTION & EQUATION

 

SCIENCE CLASS 10TH CHAPTER-CHEMICAL REACTION AND EQUATION FORMULA & IMPORTANT POINTS

Science Formulas

Difference between Physical change and Chemical change

S.NO.PHYSICAL CHANGES.NO.CHEMICAL CHANGE
(i)Those changes in which no new substances

are formed are called physical changes

(i)Those changes in which the original substances

lose their chemical nature and identity and form

new chemical substances with different

properties are called chemical changes

(ii)It is a temporary change(ii)It is a permanent change
(iii)It is easily reversible(iii)It is usually irreversible
(iv)In a physical change the mass of

substance does not alter

(iv)In a chemical change the mass of

the substance does alter

chemical reaction

Types of Chemical Reactions:

  • Addition or combination reactions: Two or more substances combine to form a single substance.

CaO+Co2→CaCO3

  • Decomposition reaction: One chemical substance splits to give two or more substances either by heat energy (Thermolysis) or light (Photolysis) or by electricity (Electrolysis).

Thermolysis

thermolysis

Electrolysis

electrolysis

Photolysis

2AgCl→2Ag+Cl2

  • Displacement Reaction: More reactive element displaces less reactive element from its compound or salt.

Fe+CuSO4→FeSO4+Cu

  • Double Displacement Reaction: Two elements interchange their respective salts or ions to form new compounds.

FeCl3+CuSO4→FeSO4+CuCl2

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