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

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## Chapter 5: Language of Chemistry

#### Selina solutions for Class 7 Chemistry Chapter 5 [Page 0]

Define chemical reaction.

What is a chemical equation?

Why do we need to balance chemical equations?

State four conditions necessary for chemical reactions to take place.

Differentiate between in Reactants and products ?

Differentiate between in Chemical reaction and chemical equation.

Differentiate between  in A balanced and a skeletal chemical equation.

Write word equation for the following skeletal equation:

KClO3 →  KCl + O2

Write word equation for the following skeletal equation:

Zn + HCl → ZnCl2 + H2

Write word equation for the following skeletal equation:

FeCl2 + Cl2 → FeCl3

Write word equation for the following skeletal equation:

CO + O2 → CO2

Write word equation for the following skeletal equation:

Ca + O2 → CaO

Write word equation for the following skeletal equation:

Na + O2 →  Na2O

Write word equation for the following skeletal equation:

NaOH + H2SO4 → Na2SO4 + H2O

Write word equation for the following skeletal equation:

AgBr →  Ag + Br2

Write word equation for the following skeletal equation:

KNO3 →   KNO2 + O2

Balance the following chemical equation :

FeS + HCl →  FeCl2 + H2S

Balance the following chemical equation :

Na2CO3 + HCl  →  NaCI + H2O + CO2

Balance the following chemical equation :

H2 + O2   →  H2O

Balance the following chemical equation :

Na20 + H20  →  NaOH

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

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

When sugar is heated.

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

When manganese dioxide is added to potassium chlorate and heated.

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

When dilute acetic acid is poured on baking soda.

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.

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

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

When water is added to quick lime?

Write symbolic representation for the following word equation and balance them :
Calcium carbonate → Calcium oxide + Carbon dioxide.

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

Carbon + Oxygen → Carbon dioxide.

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

Calcium oxide + Water → Calcium hydroxide

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

Aluminium + Chlorine → Aluminium chloride.

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

Iron + Sulphur → Iron sulphide.

#### Selina solutions for Class 7 Chemistry Chapter 5 [Page 0]

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

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

Fill in the blank:

During a chemical reaction transfer of ............. takes place.

Fill in the blank:

The basic conditions necessary for a chemical reaction is ..................

Fill in the blank:

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

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

Write true or false  :

Hydrogen sulphide has rotten egg smell .

Write true or false :

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

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

Write true or false :

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

Write true or false.

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

#### Selina solutions for Class 7 Chemistry Chapter 5 [Page 0]

A chemical equation is a statement that describes a chemical change in terms of
(a) symbols and formulae
(b) energy
(c) number of atoms
(d) colours

Balancing a chemical equation is based on
(a) Law of conservation of mass
(b) Mass of reactants and products
(c) Symbols and formulae
(d) None of the above

Copper carbonate when heated, it turns :
(a) Blue
(b) Green
(c) Black
(d) Yellow

#### Selina solutions for Class 7 Chemistry Chapter 5 [Page 0]

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_2O_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.

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

Selina solutions for Class 7 Chemistry 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 Selina Concise Chemistry - Middle School for Class 7 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 7 Chemistry chapter 5 Language of Chemistry are Concept of Chemical Reactions, Characteristics of Occurrence of a Chemical Reaction, Chemical Equations - Word Equations for Chemical Reactions, Chemical Equations - Emphasize on the Observational Skills and the Names of Products Formed, Chemical Equations - Some Examples of Word Equations for Practice., Concept of Language of Chemistry.

Using Selina Class 7 solutions Language of Chemistry exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 7 prefer Selina Textbook Solutions to score more in exam.

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