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You are here: Home / Class 10 / Chemical Reaction and equation / Chemical Equation

Chemical Equation

Last Updated on April 16, 2020 By Mrs Shilpi Nagpal 3 Comments

Question 1 What is a chemical equation?

Question 2 Give an example of chemical equation?

Question 3 What is a balanced equation?

Question 4 What is an unbalanced equation?

Question 5 What are the steps of balancing the equation?

Chemical Equation

The method of representing a chemical reaction with the help of symbols and formula is called chemical equation.

For Example :

Zinc+Sulphuric acid————->Zinc Sulphate+Hydrogen

Reactants                                      Products

The reactants are always written on left hand side in an equation with a plus sign between the.

The products are always written on right hand side in an equation with a plus sign between them.

A chemical equation is the short hand method of representing chemical reaction.

Balanced Equation:It has equal number of atoms of different elements in reactants and products.

Atom Reactant Product
Zn 1 1
H 2 2
S 1 1
O 4 4

Unbalanced Equation:It has unequal number of atoms of different elements in reactants and products.

H2 + O2 —> H2O

Atoms Reactants Products
H 2 2
O 2 1

Balancing of chemical equation

The process of making the number of different types of atoms equal on both side of an equation is called balancing equation.

Steps to balance chemical equation

(1) Write down the chemical reaction in the form of word equation,keeping reactants on left hand side and products on right hand side.

(2) Write symbol and formula of all reactants and products in word equation.

(3) Balance the equation by multiplying the symbols and formula by smallest possible figures.

(4) Make the equation informative by indicating physical state,heat changes,reaction condition.

(5) Indicate the physical state of reactant and products in an equation.we use the symbols as:solid(s), liquid(l), gas(g).

Example of balancing the equation

(1) CH4 +O2 ————>CO2 +H2O

Step 1:Make H atoms equal(Multiply products by 2)
CH4 +O2 ————>CO2 +2 H2O

Step 2: Multiply oxygen of reactants by 2

CH4 + 2O2 ————>CO2 +2 H2O                    Balanced equation

(2) (Cu)2SO4 + NaOH ————-> Cu(OH)2+Na2SO4

Step 1) Multiply sodium hydroxide by 2

CuSO4 + 2 NaOH ————-> Cu(OH)2 + Na2SO4     Balanced equation

(3) Fe + H2O————-> Fe3O4 + H2

Step 1) Multiply Fe by 3 on left hand side

3 Fe+ H2O————-> Fe3O4 + H2

Step 2)Multiply oxygen by 4 on left hand side

3 Fe+ 4 H2O————-> Fe3O4 + H2

Step 3)Multiply hydrogen by 4 on right hand side

3 Fe+ 4 H2O————-> Fe3O4 +4 H2                Balanced equation

See other topics from Chapter 1 Chemical Reaction and Equation

  • Chemical Reaction and Equation
  • Characteristics of Chemical reaction
  • Combination reaction
  • Decomposition reaction
  • Displacement Reaction
  • Double Displacement Reaction
  • Oxidation and Reduction reaction
  • Effects of oxidation Reaction in Everyday Life

Filed Under: Chemical Reaction and equation, Class 10 Tagged With: balanced equation, balancing of chemical equation, chemical reaction, products, reactants, unbalanced equation

About Mrs Shilpi Nagpal

Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading Free Education to everyone.

Reader Interactions

Comments

  1. santanu mandal. says

    May 5, 2017 at 11:05 pm

    Nice many many thanks for it.

    Reply
    • admin says

      May 8, 2017 at 10:04 am

      Welcome

      Reply
  2. Krunal Dhapodkar says

    September 8, 2019 at 8:16 pm

    Mam pls makes this notes for social science also pls

    Reply

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