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11/11/2022 0 0

Chemical reactions and equations :


  • Reactant + product = chemical equation
  • Reactant; The substance which undergo a chemical change  in the reaction 

Method of writing a reaction: 

  • Arrow must be placed between the reactants on Left hand side and product on the right hand side 
  • Plus sign (+) must be written between the reactants  
  • Arrow head must point towards the products which shows the direction of the reaction.

Example:  Magnesium + oxygen= magnesium oxide 


Balancing. a chemical equation

  1. First draw boxes around each formula
  2.  List the number of atoms of different elements present in unbalanced equation
  3. Start balancing with compound that contains maximum no of atoms
  4. Finally check the correctness of the balanced equation.
  5.  Write symbols of physical state 

Example: step -1

Fe+H20 →Fe3O4+ H2

Step -2 : 


 no of atoms in reactants 


Number of atoms in product (RHS)
Fe 1 3
H 2 2
O 1 4

step 3: 

3Fe+ 4H2O→Fe3O4+4H2

Step 4: 

Element  LHS RHS
Fe 3 3
H 8 8
O 4 4

Step 5: 

3Fe(s) +4H20(g)→Fe3O4(s) + 4H2(g)





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