1. The document discusses chemical formulas and how they are derived. It provides examples of writing chemical formulas for common reactions by balancing the atoms of the reactants and products. 2. It explains that the superscript numbers in a chemical formula indicate the relative number of atoms of each element in the compound. For example, in NaCl, sodium has a subscript of 1 and chlorine has a subscript of 2. 3. In summarizing, it states that the subscripts in a chemical formula represent the ratio of the number of atoms of each element that combine to form the compound. The relative atomic masses are used to determine these subscripts by balancing the total mass of the reactants and products.

1. NAME OF THE TEACHER : CHINCHU .P
SCHOOL : GOV.V H S S VEERANAKAVU
TOPIC : CHEMICAL FORMULA
CLASS : 9
EMMANUEL COLLEGE OF B.ED TRAINING VAZHICHAL

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Na
F2
NaF
Na + F2 NaF

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Na + F2 NaF
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Na 1 ----------------
F 2 -------------------
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BÁ§fpsSF®w
DXv]ó§fnð

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Na 1 1
F 2 2

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11. CLOSURE
C + 4Cl ……………
Mg +F2 MgF2
Mg + Cl2 …………..

12. cmkkahmIyw kaoIcn¡ I
Na +Cl2 NaCl
Mg + O2 MgO
Ca + O2 CaO