What is chemical Reaction and Equations Class-10th?


So Students, today In this blog we are going to cover some very important topics from the very first chapter of your Chemistry as well as your NCERT that is (Chemical Reactions and Equations). We are going to do a Detail Explanation some topics you can see below in the table of content.

But Before we start, If you are searching for anything else related to this chapter like- Notes, NCERT Solutions or Exemplar problems then click on the blue color of the Link.

Q. What is chemical Reaction and Equations?

Ans:- [Short Answer] Chemical reactions are the type of reactions in which the formation of new substances takes place. When two or more elements or compounds react together.

[Detailed Answer]:- This is a type of reaction in which when elements or compounds atoms react together then the old bonds present between them breaks and there a formation of new bonds takes place. That lead to the formation of a new Compound. And this complete process is known as Chemical Reaction.

Q. What are the Physical changes and the chemical changes?

Ans:- [Physical changes]:- Any change in our atmosphere that can be reversible is known as Physical Changes. Or this is a type of change when the form of the matter changes but the properties of the matter remain the same.

Example:- Evaporation of water is a physical change. Because again the gas can be converted into water.

(ii). [Chemical Changes]:- Any reaction which is not reversible in the general condition then you can be called it as a chemical change. Or you can see the answer to the that I have given above [Q1.].

Example:- 1). Fermentation of grapes. 2). Digestion of food in our body. 3). Digestion of food in our body.

Now let’s do identify reasons for some of the Examples given in your class 10th NCERT book.

What is chemical Reaction and Equations Class-10th? 1


1). Milk is left at room temperature during summers…

Ans:- When we left Milk at the room temperature in summers then, a large no. of microorganisms start growing and then the pH of milk reduces and milk becomes acidic in nature.

That causes the formation of lactic acid in Milk and hence milk gets to converted into Curd or something like cheese.

Q2. An iron Tawa/pan/nail is left exposed to a humid atmosphere?

Ans:- Iron Tawa/pan will be oxidized after some time and the Process of oxidation will be known as Rusting/Corrosion(Both in this case).

Q3. Grapes get fermented?

Ans:- This is also an example of chemical Reaction because in this reaction when we ferment grapes in the presence of Yeast Bacteria then the grapes get to convert into the Alcohol and CO2. And as you all know Alcohols are used in making Beverages/wines.

Q4. Food gets Cooked?

Ans: This is also an example of a Chemical Reaction because when we cook the food then the changes are Irreversible. That’s why this is an Example of a Chemical Reaction.

Q5. Food gets digested in ou Body?

Ans:- Once you eat food then the process of Respiration Takes place that causes the food to digest in our body and finally the food gets converted into different forms like Protein, Carbohydrates and etc…

Q6. Why did Respiration consider as chemical Reaction?

Ans:- Respiration: Oxidation of food that causes to release of the Energy is known as Respiration.

Respiration is considered as a Chemical Reaction Because new substances form when food gets Oxidise and gets converted into different forms like Protein and Carbohydrates.

Q7. How to Identify the chemical reaction is taking place or not?

Ans:- Here are the following factors through which you can identify Either any chemical reaction is taking place or not.

1). Change in the state.

Example:- H2 (g) + O2 ((g) —–> H2O _(l)

2). Change in color of the Substance.

Example:- 2FeSO4(s)+heat → Fe2O3(s)+SO2(g)+SO3(g), the Green color of ferrous sulfate gets converted into the brown color of Ferric Oxide.

3). Evolution of gas.

Example:- Zn + H2SO4 —> ZnSO4 + H2

4). Change in temperature.

Example:- CaO + H2O —-> Ca(OH)2 + H2O.

5). Formation 0f (Precipitate) PPt.

Example:- Pb(NO3)2 + KI —-> PbI2 + KNO3

Q. What is the Word Equation of any chemical reaction?

Ans:- When we write any chemical reaction in its word form like Mg+ O2 —-> MgO.

When we heat Magnesium in the presence of oxygen then it gets to converted into a white color of semi-solid substance that is MgO. This is an example of word Equations.

Note:- Generally we never use word Equation because it’s very time taking process. We generally use to write any chemical Equation in Molecular Formula, because it is very easy to read and write.

How to write an (Equation of any chemical Reaction).

We do write the Reactions on the left-hand side and the product formed in the reaction is at the right-hand side. Example:- Mg + O2 —–> MgO. Mg(magnesium) and O2 (oxygen) are reactants here. Where MgO (Magnesium Oxide) is a product here.

Balancing a Chemical Reaction:-

Ans:- No. of atoms of each and every element present at the left-hand side of the chemical Equation should always be equal to the no of atoms of the same elements present at the right side of the Equation.

** Unbalanced Chemical Reaction is also known as Skeletal Chemical Reaction.

Q. How to balance a Chemical reaction?

This is one of the most important topics in Chapter 1 (Chemical reaction and Equation). Watch this video completely to know how to do balance any chemical Reaction.

full Credit of this video goes to Edu Mantra

Hopefully, after watching this video your all doubts and concepts get clear. If not yet, then please let me know in the comment section. I will personally solve your problem for free.

Now, let’s move to one more question related to this topic which is very important?

Q. Why we need to balance any chemical Reaction?

Ans:- We need to balance any chemical reaction so that the Reaction can Satisfy the law of conservation of mass and law of Constant proportion.

Q. State the law of Conservation of mass and law of Constant proportion?

Ans:- Law of conservation of mass:- This law was given by Antonie Lavoisier. And according to this law mass can neither be created nor be destroyed in any chemical Reaction.

Law of Constant proportion: According to this in a chemical substance, elements are always present in a definite proportion by mass. Example: take water from anywhere the composition will be the same that is H2O (Water).

Now, this topic ends here, Now in the next blog, we will do continue with our next topic that different types of chemical Reactions: Click here to learn that one as well. Or you can just search and find.

If you have any doubts related to this chapter then please let me know in the comment section below. I will try to reply to you as soon as possible.

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If you want to learn more things related to this chapter then here are some links: Solve Practice Questions, Play Topic-wise Quiz, or download Exemplar book or NCERT book.

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