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![Selina solutions for Concise Chemistry [English] Class 7 ICSE chapter 4 - Atoms, Molecules and Radicals - Shaalaa.com](/images/concise-chemistry-english-class-7-icse_6:c4b696cc57c1484eba21c5a1929ab504.jpg "Selina solutions for Concise Chemistry [English] Class 7 ICSE chapter 4 - Atoms, Molecules and Radicals")
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Solutions for Chapter 4: Atoms, Molecules and Radicals
Below listed, you can find solutions for Chapter 4 of CISCE Selina for Concise Chemistry [English] Class 7 ICSE.
Selina solutions for Concise Chemistry [English] Class 7 ICSE 4 Atoms, Molecules and Radicals Exercise
Define:- Atom
Define:- Molecule
Define:- Radicals
Define:- Valency
Define:
Periodic table
Write the names of the elements present in the following compound.
Common salt
Write the names of the elements present in the:-
Ammonia
Write the names of the elements present in the :-
Sulphuric acid
Write the names of the elements present in the:-
Glucose
Write the names of the elements present in the:-
Sodium hydroxide
Write the names of the elements present in the:-
Acetic acid
What does 2C02 represent ?
What does 2H2S represent ?
What does 5H2S04 represent ?
What does 6NaNO3 represent ?
Write the symbols and valencies of the following radicals:
- Magnesium ion
- Ammonium
- Carbonate
- Nitrate
- Oxide
- Bisulphate
- Aluminium ion
Name the following radicals :
SO42
Name the following radicals :
HC03
Name the following radicals :
OH
Name the following radicals :
Cr2072
Name one ion for each of the valencies +1, +2 and +3.
Name one ion for each of the valencies-1, -2 and -3.
The valency of calcium is 2. Write the valencies of other radical in the following :
- CaO
- Ca(OH)2
- CaC03
- CaCl2
Write the names of `("NH"_4)_2"SO"_4` compounds:
Write the names of `"Ca"("NO"_3)_2` compounds :
Write the names of `"FeS"` compounds :
Write the names of `"CuCo"_3` compounds :
Write the names of `"Na"_3"PO"_4` compounds :
Write the names of `"NH"_4"OH"` compounds :
Write the names of `"HgO"` compounds :
Write the names of `"ZnCl"_2 ` compounds :
Write the names of ZnS compounds :
Write the names of `"H"_2"S"` compounds :
Write the molecular formulae of Sodiun sulphide:
Write the molecular formulae of Magenesium oxide :
Write the molecular formulae of Calcium hydroxide :
Write the molecular formulae of Hydrogen chloride :
Write the molecular formula of sulphuric acid.
Write the molecular formulae of Iron (II) sulphide :
Write the molecular formulae of Iron (III) sulphide:
Write the molecular formulae of Nitric acide :
Write the molecular formulae of Calcium phosphate :
Write the molecular formulae of Aluminium sulphate :
Write the molecular formulae of Magnesium nitride:
The valency of sodium is one, write the molecular formula for sodium oxide ?
The valency of sodium is one, write the molecular formula for sodium sulphate ?
The valency of sodium is one, write the molecular formula for sodium carbonate ?
The valency of sodium is one, write the molecular formula for sodium hydroxide ?
The valency of sodium is one, write the molecular formula for sodium nitratev ?
What is variable valency ? Give two examples of elements showing variable valency.
Give the group number of following elements present in periodic table
An element belongs to group VA. What would be its valency? Name two such elements.
An element belongs to group II. What would be its valency? Write the formula of molcules of compounds it will form with elements in VA, VIA and VIIA groups.
Selina solutions for Concise Chemistry [English] Class 7 ICSE 4 Atoms, Molecules and Radicals Objective type questions
Fill in the blank:
Atoms are _____
Fill in the blank
An ion with positive charge is called ______
Fill in the blank
An ion with negative charge is called _______
Fill in the blank.
2H2 means two _______ of hydrogen.
Fill in the blank
_______ is a triatomic molecule.
Fill in the blank
Metals have ______ valency.
Fill in the blank
Chemical name of caustic soda is _______
Tick (√) the correct answer.
The valency of iron in Fe203 is
1
2
3
6
Which of the following has valency 4?
Aluminium
Oxygen
Carbon
Phosphorus
Tick (√) the correct answer.
The sulphate radical is written as S042-. What is the formula of calcium sulphate ?
Ca(S04)2
Ca2(S04)
Ca(S04)3
CaS04
Tick (√) the correct answer.
Which of the following exhibit variable valency ?
calcium
copper
carbon
chlorine
State the term.
The number of atoms present in a molecule of an element _________
State the term
The symbolic representation of a molecule ______
State the term
A group of atoms that react as a single unit ______.
State the term
The combining capacity of an element _______
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
Selina solutions for Concise Chemistry [English] Class 7 ICSE 4 Atoms, Molecules and Radicals Additional questions
Define: Ions
Define: Chemical bond
Define: Atomic number
Define: Mass number
Define: Relative atomic mass
What does an atom consist of ? Explain.
Give the charge and the mass of an electron, proton and neutron present in an atom ?
Name two particles found inside the nucleus. What are they collectively called ?
Name the particles which revolve around the nucleus.
What are orbits or shells ?
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form negative ion?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
What will be the charge present of the molecule XY after chemical combination?
What is the number of electrons donated by a magnesium atom and number of electrons accepted by a sulphur atom during their chemical combination?
How many units of charge are developed on each atom?
What is the number of electrons after the transfer of electrons in magnesium and sulphur atoms.
Diagrammatically represent the transfer of electrons.
What do you understand by the following terms valency, valence electrons and valence shell?
Name the following radicals and give their valencies:
1. SO4
2. CO3
3. OH4.
4.Cr2O7
What is variable valency ? Give two examples of elements showing variable valency.
Name three elements each whose ions have valency +1, +2 and +3 respectively
Name three non-metals/radicals which have valency -1, -2, and -3.
Define: Ionic bond
Define: Covalent bond
Give two examples for each of ionic and covalent bond.
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
Who originated the word ‘atom’ ?
What does the word ‘atom’ mean?
State Dalton’s atomic theory.
How did Neils Bohr visualise the atom ?
Name the particle or particles you would expect to find in :
The orbit of an atom
Name the particle or particles you would expect to find in :
The nucleus of an atom
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
An atom has 13 protons and 14 neutrons.
How many electrons would be present in this atom ?
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
Define: An Atom:
Define: Atomic number
Define: Mass number :
Define: Atomic weight :
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is such a particle called ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the atomic numebr of X ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
Fill in the blank
If an atom gains an electron, it is called an _______
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
Fill in the blank
A charged particle is called an _____
Fill in the blank
An _______ is electrically neutral.
Fill in the blank
An excess of electrons produces a ________ charge.
Fill in the blank
A deficiency of electrons produces a ________ charge.
Solutions for 4: Atoms, Molecules and Radicals
Selina solutions for Concise Chemistry [English] Class 7 ICSE chapter 4 - Atoms, Molecules and Radicals
Shaalaa.com has the CISCE Mathematics Concise Chemistry [English] Class 7 ICSE CISCE solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. Selina solutions for Mathematics Concise Chemistry [English] Class 7 ICSE CISCE 4 (Atoms, Molecules and Radicals) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. Selina textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.
Concepts covered in Concise Chemistry [English] Class 7 ICSE chapter 4 Atoms, Molecules and Radicals are Naming Chemical Compounds, Atoms: Building Blocks of Matter, Molecules, Classification of Molecules, Dalton's Atomic Theory, Classification of Molecules, Molecular Formula of an Elements, Classification of Molecules, Ions (Radicals) and Its Types, Difference Between Atom, Molecules, and Radicals, Periodic Trends in the Modern Periodic Table, Variable Valency, The Modern Periodic Table, Molecular Formula of Compounds, Chemical Formula or Molecular Formula.
Using Selina Concise Chemistry [English] Class 7 ICSE solutions Atoms, Molecules and Radicals exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in Selina Solutions are essential questions that can be asked in the final exam. Maximum CISCE Concise Chemistry [English] Class 7 ICSE students prefer Selina Textbook Solutions to score more in exams.
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