شرح درس
Chemical Equation
CHEMISTRY - Secondary 1
In This part we will study
Balanced chemical equations
The balanced chemical equation represents the ratios of the definite amounts by which the reactants react together to form the products.
In the balanced equation it is considered that:
 Number of atoms of each element in the reactants equals the number of its atoms in the products to satisfy the law of conservation of matter.
This is fulfilled by writing numbers preceding the elements symbols and the chemical formulas of the compounds known as the coefficients, they represent the simplest ratio by which the reactants react together to form products.

Example (1) :
Write balanced symbolic equation which represents the reaction of nitrogen gas with hydrogen gas to form ammonia gas, with writing the physical states of the reactants and the products.
Idea of Solution : (1) Writing the initial (primary) equation, and checking if it is balanced.
N2(g) + H2(g) → NH3(g)
The equation is unbalanced as the numbers of both H and N atoms are not equal in the reactants and in the products.

Best wishes to you
Mr.Ahmed Elbasha

كيمياء الصف الاول الثانوي لغات - الفصل الدراسي الاول
شرح كيمياء لغات اولي ثانوي - مستر احمد الباشا
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