Chemical Reactions and Equation | Class 10 | Future Classes
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Exploring Chemical Reactions and Equations with Future Classes

A chemical reaction and equation is a way of representing what happens when two or more substances interact. Chemical reactions involve the breaking and forming of chemical bonds, and the rearrangement of atoms. It is important to understand the concept of a chemical reaction and equation in order to understand basic chemistry. Notes, CBSE, and PDF downloads are available to help students learn more about chemical reactions and equations. PDF downloads can be found online, while CBSE notes can be found in many textbooks. With the help of these materials, students can learn the fundamentals of chemical reactions and equations.

Our website offers free PDF downloads for CBSE Class 10 Science notes covering topics such as Chemical Reactions and Equations. These notes provide a comprehensive overview of the topics, helping students to revise and prepare for exams. The PDF files are easy to download and print, making them ideal for studying on the go. Downloading from our website is secure and fast, so you can rest assured that you will have the latest and most accurate information.

CHAPTER-1 CHEMICAL REACTION AND EQUATIONS

Chemical reaction

The process in which new substances with new properties are formed from one or more substances is called Chemical Reaction.

A chemical reaction involves:

  • Change in state or colour

  • Change in temperature

  • Evolution of gas

  • Formation of precipitate

Examples:

  1. Digestion of food

  2. Respiration

  3. Rusting of iron

  4. Burning of Magnesium ribbon

  5. Formation of curd

Aqueous solution-

It is a solution in which solvent is water.

Chemical reaction

A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side.

  • The substances that take part in a chemical reaction are called Reactants.

  • The substances, which are form in a chemical reaction, is called Products.

TYPES OF CHEMICAL REACTIONS

  1. Combination reaction

  2. Decomposition reaction

    • Thermal decomposition

    • Electrolytic decomposition

    • Photolytic decomposition

  3. Displacement reaction

  4. Double displacement

  5. Oxidation and reduction

  6. Exothermic reaction

  7. Endothermic reaction

COMBINATION REACTION:

The reaction in which two or more reactants combine to form a single product.

example of combination reaction

DECOMPOSITION REACTION:

A reaction in which a single reactant breaks down to form two or more products, is known as decomposition reaction.

decomposition reaction

Decomposition reaction is three types

Thermal decomposition:

These reactions involve the use of energy in the form of heat for decomposition of the reactant.

thermal decomposition

Calcium oxide is called lime or quick lime. It has many uses one is in manufacture of cement

thermal decomposition reaction

Electrolytic Decomposition:

These reactions involve the use of electrical energy required for the decomposition of the reactant molecules.

electrolytic decomposition

Photolytic Decomposition:

These reactions involve the use of light energy for the purpose of decomposition.

photolytic decomposition

The above reaction is used in black & white photography.

DISPLACEMENT REACTION:

The chemical reaction in which a more reactive element displaces a less reactive element from its salt solution.

example displacement reaction

The iron nail becomes brownish (in colour) by deposition of Cu and the blue colour of CuSO4 changes dirty green colour due to the formation of FeSO4.

example displacement reaction

Zinc and lead are more reactive elements than copper. They displace copper from its compounds.

DOUBLE DISPLACEMENT REACTION:

A reaction in which new compounds are formed by the exchange of ions between two compounds.

EXAMPLE OF DOUBLE BDISPLACEMENT REACTION

A white precipitate of BaSO4 is formed, so it is also called a precipitation reaction.

Precipitate

It is an insoluble solid that emerges from a liquid solution.

OXIDATION AND REDUCTION:

Oxidation: The addition of oxygen to a substance and the removal of hydrogen from a substance.

EXAMPLE OF OXIDATION

Reduction: The addition of hydrogen to a substance and the removal of oxygen from a substance.

example of reduction

REDOX REACTION –

In this reaction  is reduced to Cu and H2 is oxidized to water. So, oxidation and reduction taking place together is a redox reaction.

example of redox reaction

​Some other examples

example of redox reaction

Effects of Oxidation in Daily Life

Corrosion –

  • When a metal is exposed to substances such as moisture, acid, etc. for some time, a layer of hydrated oxide is formed which weakens the metal and hence metal is said to be corroded

  • Rusting of iron, black coating on silver, and green coating on copper are examples of corrosion.

  • Corrosion can be prevented by galvanization, electroplating, or painting.

Rusting of iron

Corrosion of iron is called rusting. Iron form hydrated iron oxide (rust) when kept open in moist air.

Rusting of iron chemical reaction

Formation of a green layer over copper

New copper (brown in colour) vessel forms a green layer of basic copper carbonate after some time due to the reaction of air and moisture.

Formation of a green layer over copper chemical equation

Rancidity:

​The oxidation of fats and oils when exposed to air is known as rancidity. It leads to bad smell and bad taste of food.

Methods to Prevent Rancidity

  1. Keeping food in airtight containers

  2. Replacing air with nitrogen gas

  3. Refrigeration

Chemical reaction also classifies on the base of temperature

Exothermic Reactions:

The reaction in which heat is released along with the formation of products.

example of exothermic Exothermic Reactions

Endothermic Reactions:

The reactions which require energy in the form of heat, light, or electricity to break reactants are called endothermic reactions. Example decomposition reaction.

Extra reaction

some chemical reaction
list of ion and symbol

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Chemical Reactions and Equations - chapter 1, CBSE Class 10

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