Class 9 - Chemistry - Formulae of Simple Compounds - Atoms and Molecules
Q1: What is a chemical formula?
Answer: The chemical formula of a compound is a symbolic representation of its composition.
Q2: Write the chemical formula for the following compounds. Also identify the ions formed.
➀ Hydrogen Chloride
➁ Hydrogen Sulphide
➂ Carbon Tetrachloride
➃ Magnesium Bromide
Answer:
➀ Hydrogen Chloride
Ions formed are H⁺ (cation) and Cl⁻ (anion)
➁ Hydrogen Sulphide
Ions formed are H⁺ (cation) and S²⁻ (anion)
➂ Carbon Tetrachloride
Ions formed are C⁴⁺ (cation) and Cl⁻ (anion)
Note: As such no charge formation takes place. For simplicity, we show charges here.
➃ Magnesium Bromide
Ions formed are M²⁺ (cation) and Cl⁻ (anion)
Q3: Write the chemical formula of:
➀ Sodium Carbonate
➁ Ammonium Chloride
➂ In a molecule of sodium carbonate, how many sodium atoms are there?
➃ In a molecule of ammonium chloride, how many chloride ions are there?
Answer:
➀ Sodium Carbonate
➁ Ammonium Chloride
➂ In a molecule of sodium carbonate, there are 2 sodium atoms.
➃ In a molecule of ammonium chloride, there is 1 chloride ion.
👉See Also:
How to learn naming Chemical Formula
Ch 3 - Atoms and Molecules
Ch 3 - Atoms and Molecules (Worksheet)
Ch3 - Atoms and Molecules (MCQs)
Ch 3 - Atoms, Molecules and Ions (Study Points)
Ch 3 - Atoms and Molecules (MCQs-2)
Ch 3 - Atoms and Molecules - Atomicity of Elements (Worksheet)
All about Names of the Chemical Elements
Ch 3 - Atoms and Molecules (Important Definitions)
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