NCERT Solutions for Class 9 Science Chapter 3
Atoms And Molecules
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-39
Questions No-3
What is meant by the term chemical formula?
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NCERT Solutions for Class 9 Science Chapter 3
Atoms And Molecules
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-39
Questions No-3
The chemical formula of a compound means the symbolic representation of the composition of a compound. From the chemical formula of a compound, we can know the number and kinds of atoms of different elements that constitute the compound. For example, from the
chemical formula CO₂ of carbon dioxide, we come to know that one carbon atom and two oxygen atoms are chemically bonded together to form one molecule of the compound, carbon dioxide.
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Chemical Formula: A Concise Composition Notation
– Definition: A chemical formula is a symbolic representation illustrating the types and quantities of atoms present within a compound.
– Symbolic Representation: Utilizes elemental symbols (e.g., H for hydrogen, O for oxygen) and subscripts to denote the number of atoms in a compound.
– Types of Formulas:
– Molecular Formula: Specifies the actual count of atoms in a compound (e.g., H2O for water).
– Empirical Formula: Represents the simplest whole-number ratio of elements (e.g., CH2O for formaldehyde).
– Significance: Provides essential information about a compound’s composition, aiding in understanding its properties and behavior in chemical reactions. Serves as a standardized language in chemistry for communication and documentation.