Page 78 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

Now, look at the balanced chemical equations given below. Write
down the reactants and products in the table.

(1) C+ O CO
2 2
(2) H + Cl 2HCl
2 2
(3) 2H + O 2H O
2 2 2
No. Reactants Products

1

2

3
Table 5.12

The equations given below are not balanced. Can you balance
them?
Mg + O MgO
2
NaOH + H SO Na SO + H O
2 4 2 4 2
N + H NH
2 2 3
H O H O + O
2 2 2 2
Write down the equations for the chemical reactions familiar to
you and try to balance them. You will learn more chemical
reactions and chemical equations in higher classes.

Significant learning outcomes

The learner can
• distinguish between elements and compounds.
• identify the symbols of different elements.

• list the atoms present in the molecules of elements and
compounds.
• formulate the symbols for different elements.
• write the chemical formulae of different compounds.

• write and balance the equations for chemical changes.

Basic Science VIII
Basic Science VIII 77 77