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Study Material for Class 10 Science Chapter 1 Chemical Reactions and Equations
Class 10 Science students should refer to the following Pdf for Chapter 1 Chemical Reactions and Equations in Class 10. These notes and test paper with questions and answers for Class 10 Science will be very useful for exams and help you to score good marks
Class 10 Science Chapter 1 Chemical Reactions and Equations
CBSE Class 10 Science Chemical Reactions And Equations. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations. Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.
CHEMICAL REACTIONS AND EQUATIONS
1. During chemical reactions, chemical composition of substances changes or new substances are formed.
2.Chemical reactions can be written in chemical equation form which should be always balanced.
3. Types of Chemical Reactions
4. i)Exothermic reaction: A chemical reaction in which heat energy is evolved.
C + O2 →CO2 (g) + heat
ii)Endothermic reaction: A chemical reaction in which heat energy is absorbed.
ZnCO3 + Heat →ZnO + CO2
5 .Redox reaction: Chemical reaction in which both oxidation and reduction take place simultaneously.
Oxidation: Reaction that involves the gain of oxygen or loss of hydrogen.
Reduction: Reaction that shows the loss of oxygen or gain of hydrogen
ZnO + C →Zn + CO
ZnO is reduced to Zn -reduction
C is oxidized to CO ------oxidation
6. Effectsof oxidation reactions in our daily life:
a)Corrosion: It is an undesirable change that occurs in metals, when they are attacked by moisture, air, acids and bases.
Corrosion (rusting) of iron: Fe2O3. xH2O (Hydrated iron oxide)
Corrosion of copper:CuCO3.Cu (OH)2 (Basic copper carbonate)
Corrosion of silver:Ag2S (Silver sulphide)
Corrosion of Aluminum: Al2O3 (Aluminum oxide)
b)Rancidity: Undesirable change that takes place in oil containing food items due to the oxidation of fatty acids.
Preventive methods
(1)Adding antioxidants to the food materials.
(2) Storing food in air tight container
(3) Flushing out air with nitrogen gas.
(4) Refrigeration
Please click the link below to download CBSE Class 10 Science Chemical Reactions And Equations.
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CBSE Class 10 Science Chapter 1 Chemical Reactions and Equations Study Material
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