 CBSE & NCERT Class 10 Science Chemical Reactions And Equations – Chapter 1 CBSE & NCERT Class 10 Science Chemical Reactions And Equations – Chapter 1

Class 10 Science Chemical Reactions And Equations:

Very interesting chapter of ‘Class 10 Science‘ is about chemical reactions and equations. We have already studied in Class 9 Science about the physical properties of matter. Physical properties of matter can change due to melting, boiling, and condensation. A Chemical change occurs when the nature and the identity of the initial substance have somewhat changed. Some examples stated below-

Eg: – Milk left at room temperature in summers becomes sour

Food get digested in our body.

This chemical change happens due to chemical reaction. We can say if there any of the below-mentioned change we can say chemical reactions taken place.

• Change in state
• Change in color
• Evolution of a gas
• Change in temperature.

Class 10 Science students can experiment the below in the chemistry lab.

Activity:-

• Take a few zinc granules in a conical flask or a test tube
• Add dilute hydrochloric acid or sulphuric acid to this
• Do you observe anything happening around the zinc granules?
• We Can see Formation of hydrogen gas by the action of dilute sulphuric acid on zinc

Chemical Equations:-

The symbolic representation of a chemical reaction is called a chemical equation. Now, the question arises how we write these chemical equations. Chemical equations can be written in chemical formulas instead of writing the chemical name in words

For Eg:-

Magnesium+ Oxygen=Magnesium oxide, which can be easily written as

Mg+O2=MgO

Points to Ponder while writing a chemical equation:-

If the number of atoms of each element on the LHS and the RHS is same then it is called the balanced equation.

If the atoms are not equal, then the equation is unbalanced and it is called the skeleton chemical equation.

Balanced Chemical Equation

The law of conservation of mass says that mass cannot be created nor destroyed in the chemical equation. The total elements mass present in the products of the chemical reaction has to be equal to the total elements mass present in the reactants. Eg:-

Zinc+Sulphuric acid= Zinc sulphate + Hydrogen chemical representation of this equation is

Zn+H2SO4=ZnSO4+H2

The number of atoms is equal on both the sides so this is a balanced equation.

How to write a chemical equation?

1. To balance a chemical equation, first draw boxes around each formula.
2. Counting the number of atoms of each element on both sides of the equation.
3. Start balancing with the compound that contains the maximum number of atoms. It may be a reactant or a product.
4. To check the accuracy of the balanced equation, we count atoms of each element on both sides of the equation
5. To make a chemical equation more informative, the physical states of the reactants and products are mentioned along with their chemical formulas.

So, the above-mentioned ‘Class 10 Science Notes’ on chemical equations will clear the concepts. For ‘CBSE Exams’ and ‘NCERT Solutions’ or Class 10

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June 26, 2017

IBPS CLERK 2017 VACANCY & RECRUITMENT NOTIFICATION & SYLLABUS – EXAM DATE 