Saturday 12 February 2022

Class 9 - Chemistry - Formulae of Simple Compounds - Atoms and Molecules #class9Chemistry #class9Science #eduvictors #cbseClass9

Class 9 - Chemistry - Formulae of Simple Compounds - Atoms and Molecules

Class 9 - Chemistry - Formulae of Simple Compounds - Atoms and Molecules #class9Chemistry #class9Science #eduvictors #cbseClass9


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.

Hydrogen Chloride

Hydrogen Sulphide

Carbon Tetrachloride

Magnesium Bromide


Answer: 

Hydrogen Chloride

Class 9 - Chemistry - Formulae of Simple Compounds - Atoms and Molecules #class9Chemistry #class9Science #eduvictors #cbseClass9

Ions formed are H⁺ (cation) and Cl⁻ (anion)

Hydrogen Sulphide

Class 9 - Chemistry - Formulae of Simple Compounds - Atoms and Molecules #class9Chemistry #class9Science #eduvictors #cbseClass9


Ions formed are H⁺ (cation) and S²⁻ (anion)


Carbon Tetrachloride

Class 9 - Chemistry - Formulae of Simple Compounds - Atoms and Molecules #class9Chemistry #class9Science #eduvictors #cbseClass9


Ions formed are C⁴⁺ (cation) and Cl⁻ (anion)

Note: As such no charge formation takes place. For simplicity, we show charges here.


Magnesium Bromide

Class 9 - Chemistry - Formulae of Simple Compounds - Atoms and Molecules #class9Chemistry #class9Science #eduvictors #cbseClass9


Ions formed are M²⁺ (cation) and Cl⁻ (anion)


Q3: Write the chemical formula of:

Sodium Carbonate

Ammonium Chloride

In a molecule of sodium carbonate, how many sodium atoms are there?

In a molecule of ammonium chloride, how many chloride ions are there?


Answer:

Sodium Carbonate

Class 9 - Chemistry - Formulae of Simple Compounds - Atoms and Molecules #class9Chemistry #class9Science #eduvictors #cbseClass9


Ammonium Chloride

Class 9 - Chemistry - Formulae of Simple Compounds - Atoms and Molecules #class9Chemistry #class9Science #eduvictors #cbseClass9


In a molecule of sodium carbonate, there are 2 sodium atoms.

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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