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Concise Chemistry Class 9 ICSE Solutions for Chapter 1 - Language of Chemistry

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Last updated date: 22nd Mar 2024
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ICSE Class 9 Chemistry Chapter 1 Selina Concise Solutions - Free PDF Download

Updated ICSE Class 9 Chemistry Chapter 1 - Language of Chemistry Selina Solutions are provided by Vedantu in a step-by-step method. Selina is the most famous publisher of ICSE textbooks. Studying these solutions by Selina Concise Chemistry Class 9 Solutions which are explained and solved by our subject matter experts will help you in preparing for ICSE exams. Concise Chemistry Class 9 ICSE Solutions can be easily downloaded in the given PDF format. These solutions for Class 9 ICSE will help you to score good marks in ICSE Exams 2019-20.

The updated solutions for Selina textbooks are created in accordance with the latest syllabus. These are provided by Vedantu in a chapter-wise manner to help the students get a thorough knowledge of all the fundamentals.

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Language of Chemistry

Chemistry has also had its language and that includes symbol, valency, equation, ion, atom, molecule, reaction, and so on. A chemical symbol is always denoted in the short form related to a particular or specific element or an atom of that element. With the help of these chemical symbols, it makes it easier for us to write chemical formulas and equations instead of writing the lengthy chemical names of each element or atom. Several scientists have given a thought and plan related to the symbolic representation of these elements.

What is a Valency?

Valency is defined as the combining capacity of an element or in other words it is related to the number of electrons which an atom gains or shares or loses when this chemical reaction takes place along with other elements is known as Valency. The classification of these elements is based on the monovalent, divalent, and so on is related to their valency. Molecules are basically formed in order to satisfy the valency of an atom.

What is a Chemical Symbol?

A chemical symbol is represented with the help of two letters which refer to the atom of a chemical element. A symbol plays an indispensable role in the study of the elements. Example Chlorine is written as Cl and the name of the element is chlorine, one atom of chlorine and the atomic mass of chlorine is 17 a.m.u


Valency represents the combining capacity of an atom or radical in its own way. It is generally considered as the number of hydrogen atoms that will get combined with or displace one atom of that element or radical. The nature of metal is electropositive and loses electrons in order to attain octet configuration. Metals belonging to Group 1 are all alkali metals and have got only one valence electron and are univalent whereas metals belonging to Group 2 are all alkaline metals with 2 valence electrons and are all divalent in nature. Metals that are in Group 3 consist of 3 valences and are all trivalent in nature.

  • Na – e–  ⇨ Na+ (univalent).

  • Ca – 2e–  ⇨ Ca2+ (divalent).

  • Al – 3 e–  ⇨ Al3+ (trivalent).

The nature of non-metal is supposed to be electronegative in nature and gain electrons to attain octet configuration.

  • Cl + e– ⇨ Cl (univalent).

  • O + 2e– ⇨ O2- (divalent).

  • N + 3e– ⇨N3- (trivalent).

Metals belonging to Group 4 like carbon, silicon, and other metals have 4 valence electrons and are tetravalent in nature. In normal cases or conditions, these elements share electrons with one or more other elements in order to gain octet configuration.


However, Sn4+ and Pb4+ also exist.

Variable Valency

When there is a loss of electrons from the valence shell and also from the penultimate shell, then it is known as Variable Valency.

Radicals

When a single atom or a group of atoms starts behaving like a single unit and if it consists of negative and positive ions then it is known as Radical. Radical is said to be very reactive as well as with a unique valency.

Table of Positive Valency

Element

Ion Formed

Valency

Hydrogen

H+

+1

Sodium

Na+

+1

Potassium

K+

+1

Ammonium

NH4+

+1

Cuprous (Copper I)

Cu+

+1

Magnesium

Mg2+

+2

Calcium

Ca2+

+2

Cupric (Copper II)

Cu2+

+2

Plumbous (Lead II)

Pb2+

+2

Ferrous (Iron II)

Fe2+

+2

Aluminum

Al3+

+3

Chromium

Cr3+

+3

Ferric (Iron III)

Fe3+

+3

Table of Negative Valency

Element

Ion Formed

Valency

Hydroxide

OH

-1

Fluoride

F

-1

Bromide

Br

-1

Chloride

Cl

-1

Bicarbonate

HCO3

-1

Chlorate

ClO3

-1

Permanganate

MnO4

-1

Nitrate

NO3

-1

Sulphate

SO42-

-2

Oxide

O2-

-2

Carbonate

CO32-

-2

Dicarbonate

Cr2O72-

-2

Nitride

N-3

-3

Phosphate

PO4-3

-3

FAQs on Concise Chemistry Class 9 ICSE Solutions for Chapter 1 - Language of Chemistry

1. What do you mean by symbol? What message does it give?

A symbol is a short form of an element or atom or the abbreviation which is used to denote an element. It gives useful information or message and they are as follows:

a. It represents a particular element.

b. It refers to one atom of the element.

c. It represents how many atoms there are in one gram of atom.

d. It refers to the number of times the atom is heavier than the one atomic mass unit taken as a standard.

2. Define Valency and Variable Valency? How are the elements with variable valency named?

The capacity of an atom to lose, share or gain atoms when a chemical reaction takes place is known as Valency. When there is a loss of electrons from the valence shell and also from the penultimate shell, then it is known as Variable Valency. If an element represents two different positive valences then for the lower valency use the suffix-OUS at the end of the name of the metal and for higher valency use the suffix- IC at the end of the name of the metal.

3. What is radical? Define acidic radical and basic radical.

When a single atom or a group of atoms starts behaving like a single unit and if there is a presence of negative and positive ions then it is known as Radical. Radical got has at least one unpaired valence electron and because of that, they become extremely active. Radical is said to be very reactive as well as with a unique valency. Acidic radical refers to the negatively charged radical and positively charged radical represents the basic radical in the language of chemistry.

4. What is a chemical equation and why is it necessary to balance it?

The symbolic representation of a chemical reaction is known as a chemical equation and it is an indispensable step to balance it because according to a law of conservation of mass," matter can neither be created nor be destroyed" and this could be possible only when the number of atoms on the reactant side is equal to the number of atoms on the product side and that makes it balanced. Balancing the equations to be well practised by students.

5. What is the importance of formulas?

The formula represents the number of atoms present in the molecule and of the substance and its significance is mentioned below:

  • It helps in finding information about chemical compounds.

  • It tells us the name of the element.

  • It gives us information about the number of atoms there are in a substance. 

  • It describes the chemical makeup of the element and represents one mole of the molecule of the substance.

The creation of chemical formulas was an important discovery in the language of Chemistry.