CBSE Class 10 Chemistry Chemical Reactions And Equations Notes Set C

Download CBSE Class 10 Chemistry Chemical Reactions And Equations Notes Set C in PDF format. All Revision notes for Class 10 Chemistry have been designed as per the latest syllabus and updated chapters given in your textbook for Chemistry in Standard 10. Our teachers have designed these concept notes for the benefit of Grade 10 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 10 Chemistry for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 10 Chemistry given our website

Chemical Reactions And Equations Class 10 Chemistry Revision Notes

Class 10 Chemistry students should refer to the following concepts and notes for Chemical Reactions And Equations in standard 10. These exam notes for Grade 10 Chemistry will be very useful for upcoming class tests and examinations and help you to score good marks

Chemical Reactions And Equations Notes Class 10 Chemistry

CBSE Class 10 Chemistry Chemical Reactions & Equations Notes. Learning the important concepts is very important for every student to get better marks in examinations. The concepts should be clear which will help in faster learning. The attached concepts made as per NCERT and CBSE pattern will help the student to understand the chapter and score better marks in the examinations.

Class-X

Chemistry

Ch.1: Chemical Reactions And Equations

Top definitions:

1. Chemical reaction: A chemical reaction involves a chemical change in which substances react to form new substances with entirely new properties. Substances that react or take part in the reaction are known as reactants and the substances formed are known as products.

2. Physical change: If a change involves change in colour or state but no new substance is formed, then it is a physical change.

3. Chemical change: If a change involves formation of new substances, it is a chemical change.

4. Chemical equation: The symbolic representation of a chemical reaction is called a chemical equation.

5. Exothermic and endothermic reactions: If heat is evolved during a reaction, then such a reaction is known as exothermic reaction. If heat is absorbed from the surroundings, then such a reaction is known as endothermic reaction

6. Combination reaction: Combination reaction is a reaction in which 2 or more substances combine to give a single product.

7. Decomposition reaction: In a decomposition reaction, a single reactant decomposes to give 2 or more products. Decomposition reactions require energy in the form of heat, light or electricity

8. Displacement reaction: A reaction in which a more active element displaces less active element from its salt solution.

9. Reactivity series: The Reactivity series is a list of metals arranged in the order of decreasing reactivity. The most reactive metal is placed at the top and the least reactive metal is placed at the bottom.

10.Double displacement reaction: A chemical reaction in which there is an exchange of ions between the reactants to give new substances is called a double displacement reaction. 

11.Precipitation reaction: An insoluble solid known as precipitate is formed during a double displacement reaction. Such reactions are also known as precipitation reactions.

12.Redox reaction: A reaction, in which oxidation and reduction takes place simultaneously is known as redox reaction.

13.Oxidation: Oxidation is a chemical process in which a substance gains oxygen or loses hydrogen.

14.Reduction: Reduction is a chemical process in which a substance gains hydrogen or loses oxygen. 

Key learnings:

1. A chemical reaction involves a chemical change in which substances react to form new substances with entirely new properties. Substances that react or take part in the reaction are known as reactants and the substances formed are known as products.

2. During a chemical reaction, there is a breaking of bonds between atoms of the reacting molecules to give product

3. A chemical reaction can be observed with the help of any of the following observations:

a) Evolution of a gas
b) Change in temperature
c) Formation of a precipitate
d) Change in colour
e) Change of state

4. Physical change: If a change involves change in colour or state but no new substance is formed, then it is a physical chang

5. Chemical change: If a change involves formation of new substances, it is a chemical change.

6. Exothermic and endothermic reactions: If heat is evolved during a reaction, then such a reaction is known as Exothermic reacti If heat is absorbed from the surroundings, then such a reaction is known as endothermic reaction.

7. Chemical equation: The symbolic representation of a chemical reaction is called a chemical equation.

8. Features of a chemical equation:

a. The reactants are written on the left hand side with a plus sign between them.

b. The products are written on the right hand side with a plus sign between them.

c. An arrow separates the reactants from the products. The arrow head points towards the products and indicates the direction of the reaction.

9. Skeletal chemical equation: A chemical equation which simply represents the symbols and formulae of reactants and products taking part in the reaction is known as skeletal chemical equation for a reaction. For example: For the burning of Magnesium in the air, Mg + O2 → MgO is the skeletal equation.

10. Balanced chemical equation: A balanced equation is a chemical equation in which number of atoms of each element is equal on both sides of the equation i.e. number of atoms of an element on reactant side = number of atoms of that element on the product side.

11. As per the law of conservation of mass, the total mass of the elements present in the products of a chemical reaction is equal to the total mass of the elements present in the reactants.

12. The process of equating the number of atoms on both the sides of a chemical equation is known as balancing of a chemical equation.

a. The first step in balancing a chemical equation is to write the number of atoms of each element present on the left hand side and right hand side.

b. We should always start balancing with the compound that contains maximum number of atom It can be reactant or a product. Then in that compound select the element which has the maximum number of atoms.

c. While balancing a chemical equation, the molecular formulae of the reactants and products should not change. The molecular formulae are simply multiplied by suitable coefficients.

d. To make a chemical equation more informative, the reaction conditions such as temperature, pressure or catalyst are written on the arrow separating the reactants and products.

e. The evolution of gas is indicated by an upward arrow.

f. The formation of precipitate is indicated by a downward arrow.

g. Heat evolved during the reaction is written as + Heat on the product side.

h. Heat absorbed during the reaction is written as + Heat on the reactant side.

13.Types of chemical reactions:

a. Combination reaction
b. Decomposition reaction
c. Displacement reaction
d. Redox reaction

14.Combination reaction is a reaction in which 2 or more substances combine to give a single product. Combination reaction can be between 2 elements, between an element and a compound or between 2 compounds.

15.Decomposition reaction: In a decomposition reaction, a single reactant decomposes to give 2 or more products. Decomposition reactions require energy in the form of heat, light or electricity

16.Types of decomposition reactions:

a. Decomposition reactions which require heat are known as thermolytic decomposition reactions
b. Decomposition reactions which require light are known as photolytic decomposition reactions
c. Decomposition reactions which require electricity are known as electrolytic decomposition reactions

17.Displacement reaction: A reaction in which a more active element displaces less active element from its salt solution.

18.The reactivity series is a list of metals arranged in the order of decreasing reactivity. The most reactive metal is placed at the top and the least reactive metal is placed at the bottom.

19.Double displacement reaction: A chemical reaction in which there is an exchange of ions between the reactants to give new substances is called double displacement reaction.

20.Precipitation reaction: An insoluble solid known as precipitate is formed during a double displacement reaction. Such reactions are also known as precipitation reactions.

21.Redox reaction: A reaction in which oxidation and reduction take place simultaneously in a reaction, is known as a redox reaction.

22.Oxidation is a chemical process in which a substance gains oxygen or loses hydrogen.

23.Reduction is a chemical process in which a substance gains hydrogen or loses oxygen.

24.If a substance gains oxygen or loses hydrogen during a reaction, it is said to be oxidised.

25.If a substance gains hydrogen or loses oxygen during a reaction, it is said to be reduced.

26.A substance that loses oxygen or gains hydrogen is known as an oxidising agent.

27.A substance that loses hydrogen or gains oxygen is known as a reducing agent.

28.An oxidising agent gets reduced whereas a reducing agent gets oxidised.

29. In terms of electronic concept, Oxidation is defined as a loss of electrons while reduction is defined as a gain of electr

30. Corrosion is the slow eating up of metals by the action of air and moisture on their surface Corrosion in case of Iron is known as Rusting.

31.Chemically, rust is hydrated ferric oxide (Fe2O3.xH2O)

32.Advantages of corrosion: Though corrosion is undesirable, it can be advantageous in case of aluminium which on exposure to air, gets coated with a protective layer of aluminium oxide. This protects the metal underneath from further corrosion and damage.

33.Rancidity: When oils and fats or foods containing oils and fats are exposed to air, they get oxidised due to which the food becomes stale and gives a bad taste or smell. This is called Rancidity.

34. Rancidity can be prevented by:

a) Adding antioxidants i.e. the substances which prevent oxidation
b) Refrigeration
c) Storing the food in air-tight containers

 

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