# Selina solutions for Concise Chemistry Class 7 ICSE chapter 5 - Language of Chemistry [Latest edition]

## Chapter 5: Language of Chemistry

ExerciseObjective type questionsMultiple choice questionsAdditional questions
Exercise

### Selina solutions for Concise Chemistry Class 7 ICSE Chapter 5 Language of Chemistry Exercise

Exercise | Q 1.1

Define chemical reaction.

Exercise | Q 1.2

What is a chemical equation?

Exercise | Q 1.3

Why do we need to balance chemical equations?

Exercise | Q 2

State four conditions necessary for chemical reactions to take place.

Exercise | Q 3.1

Differentiate between in Reactants and products?

Exercise | Q 3.2

Differentiate between in Chemical reaction and chemical equation.

Exercise | Q 3.3

Differentiate between in A balanced and a skeletal chemical equation.

Exercise | Q 4.1

Write word equation for the following skeletal equation:

KClO3 →  KCl + O2

Exercise | Q 4.2

Write word equation for the following skeletal equation:

Zn + HCl → ZnCl2 + H2

Exercise | Q 4.3

Write word equation for the following skeletal equation:

FeCl2 + Cl2 → FeCl3

Exercise | Q 4.4

Write word equation for the following skeletal equation:

CO + O2 → CO2

Exercise | Q 4.5

Write word equation for the following skeletal equation:

Ca + O2 → CaO

Exercise | Q 4.6

Write word equation for the following skeletal equation:

Na + O2 →  Na2O

Exercise | Q 4.7

Write word equation for the following skeletal equation:

NaOH + H2SO4 → Na2SO4 + H2O

Exercise | Q 4.8

Write word equation for the following skeletal equation:

AgBr →  Ag + Br2

Exercise | Q 4.9

Write word equation for the following skeletal equation:

KNO3 →   KNO2 + O2

Exercise | Q 5.1

Balance the following chemical equation :

FeS + HCl →  FeCl2 + H2S

Exercise | Q 5.2

Balance the following chemical equation :

Na2CO3 + HCl  →  NaCI + H2O + CO2

Exercise | Q 5.3

Balance the following chemical equation :

H2 + O2   →  H2O

Exercise | Q 5.4

Balance the following chemical equation :

Na20 + H20  →  NaOH

Exercise | Q 6

What information do you get from the equation H2+ Cl2  →  2HCl ?

Exercise | Q 7.1

Write your observation for the following chemical reaction and name the product formed :

When sugar is heated.

Exercise | Q 7.2

Write your observation for the following chemical reaction and name the product formed :

When manganese dioxide is added to potassium chlorate and heated.

Exercise | Q 7.3

Write your observation for the following chemical reaction and name the product formed :

When dilute acetic acid is poured on baking soda.

Exercise | Q 7.4

Write your observation for the following chemical reaction and name the product formed :

When an aqueous solution of sodium chloride is mixed with an aqueous solution of silver nitrate.

Exercise | Q 7.5

Write your observation for the following chemical reaction and name the product formed :
When ammonium chloride is heated with sodium hydroxide.

Exercise | Q 7.6

Write your observation for the following chemical reaction and name the product formed :

When water is added to quick lime?

Exercise | Q 8.1

Write symbolic representation for the following word equation and balance them :

Calcium carbonate → Calcium oxide + Carbon dioxide.

Exercise | Q 8.2

Write symbolic representation for the following word equation and balance them :

Carbon + Oxygen → Carbon dioxide.

Exercise | Q 8.3

Write symbolic representation for the following word equation and balance them :

Calcium oxide + Water → Calcium hydroxide

Exercise | Q 8.4

Write symbolic representation for the following word equation and balance them :

Aluminium + Chlorine → Aluminium chloride.

Exercise | Q 8.5

Write symbolic representation for the following word equation and balance them :

Iron + Sulphur → Iron sulphide.

Objective type questions

### Selina solutions for Concise Chemistry Class 7 ICSE Chapter 5 Language of Chemistry Objective type questions

Objective type questions | Q 1.1

Fill in the blank:
The substances which undergo chemical change are called _______

Objective type questions | Q 1.2

Fill in the blank:
The substances formed as a result of a chemical reaction are called _______

Objective type questions | Q 1.3

Fill in the blank:

During a chemical reaction transfer of ________ takes place.

Objective type questions | Q 1.4

Fill in the blank:

The basic conditions necessary for a chemical reaction is _______

Objective type questions | Q 1.5

Fill in the blank:

In some chemical reactions an insoluble ________ is formed when two solutions are mixed.

Objective type questions | Q 2.1

Write true or false  :
No new substance is formed during a chemical reaction.

• True

• False

Objective type questions | Q 2.2

Write true or false  :

Hydrogen sulphide has rotten egg smell .

• True

• False

Objective type questions | Q 2.3

Write true or false :

When potassium iodide solution is added to lead acetate solution a red precipitate is formed.

• True

• False

Objective type questions | Q 2.4

Write true or false .
A black residue is formed when sugar is heated .

• True

• False

Objective type questions | Q 2.5

Write true or false :

When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .

• True

• False

Objective type questions | Q 2.6

Write true or false.

A chemical equation gives only qualitative information of a chemical reaction.

• True

• False

Multiple choice questions

### Selina solutions for Concise Chemistry Class 7 ICSE Chapter 5 Language of Chemistry Multiple choice questions

Multiple choice questions | Q 1

A chemical equation is a statement that describes a chemical change in terms of

• symbols and formulae

• energy

• number of atoms

• colours

Multiple choice questions | Q 2

Balancing a chemical equation is based on

• Law of conservation of mass

• Mass of reactants and products

• Symbols and formulae

• None of the above

Multiple choice questions | Q 3

Copper carbonate when heated, it turns :

• Blue

• Green

• Black

• Yellow

### Selina solutions for Concise Chemistry Class 7 ICSE Chapter 5 Language of Chemistry Additional questions

Define chemical reaction.

What is a chemical equation?

Why do we need to balance chemical equations?

State four conditions necessary for a chemical reaction to take place.

Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.

Balance the following equation :

Fe + O2 → Fe3 O4

Balance the following equation :

Fe + H2O → Fe3O4 + H2

Balance the following equation .

N2 + O2 → NO

Balance the following equation :

Pb3O4 → PbO + O2

Balance the following equation. Also name the product formed.

"NaNO"_3  → "NaNO"_2  + "O"_2  Name of product (s)

Balance the following equation Also name the product formed.

"K" + "CI"_2 → "KCI"

Balance the following equation. Also name the products formed.

"Ag" + "S"   → " Ag"_2 "S"

Balance the following equation. Also name the products formed.

"Mg" + "O"_2  →  "MgO"

Balance the following equation. Also name the product formed.

"KCIO"_3 →  "KCI" +"O"_2

Balance the following equation. Also name the product formed.

 "H"_2"O"_2    →  "H" _2 "O" + "O"_2

Balance the following equation. Also name the product formed.

"H"_2 +"CI"_2  →  "HCI"

Balance the following equation. Also name the product formed.

"Na"+ "H"_2 "O" → "NaOH"+ "H"_2

Balance the following equation. Also name the product formed.

"CO" + "O"_2  → " CO"_2

Balance the following equation. Also name the product formed.

"Zn" + "HCI" →  "ZnCI" _2 + "H"_2

Balance the following equation. Also name the product formed.

K2O + H2O    → KOH

Balance the following equation. Also name the product formed.

CO2 + C →  CO

Balance the following equation. Also name the product formed.

N2 + H2   →  NH

Balance the following equation. Also name the product formed.

PbCO3    →   PbO +CO2

Balance the following equation. Also name the product formed.

FeCI2 + CI2 →  FeCI3

State what you would observe when the following substance is heated in a glass test tube red lead.

State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .

Explain the following reaction with one suitable example of Combination reactions .

Explain the following reaction with one suitable example of Decomposition reaction

Explain the following reaction with one suitable example of Displacement reaction.

Explain the following reaction with one suitable example of Double decomposition reaction.

Name the type of chemical reaction shown by the following equation:

CaCO3 → CaO + CO2

Name the type of chemical reaction shown by the following equation:

2Mg + O2 → 2MgO

Name the type of chemical reaction shown by the following equation:

Fe + CuSO4 → FeSO4 + Cu

Name the type of chemical reaction shown by the following equation:

NaOH + HCl → NaCl + H2O

Name the type of chemical reaction shown by the following equation :

Fe2O3 + 2Al → Al2O3 + 2Fe

Write your observation and name the product when zinc reacts with dilute hydrochloric acid.

Write your observation and name the product when ron nails are added to an aqueous solution of copper sulphate.

Write your observation and name the product when An aqueous solution of barium chloride is added to dilute sulphuric acid.

A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.

A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.

## Chapter 5: Language of Chemistry

ExerciseObjective type questionsMultiple choice questionsAdditional questions

## Selina solutions for Concise Chemistry Class 7 ICSE chapter 5 - Language of Chemistry

Selina solutions for Concise Chemistry Class 7 ICSE chapter 5 (Language of Chemistry) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Concise Chemistry Class 7 ICSE solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Concise Chemistry Class 7 ICSE chapter 5 Language of Chemistry are Classification of Change: Chemical Changes, Chemical Equation, Chemical Reaction, Conditions Necessary for Chemical Reactions, Indicators of a Chemical Change (Chemical Reaction), Balancing Chemical Equation.

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