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Chapters
2: Physical and Chemical Changes
▶ 3: Elements, Compounds and Mixtures
4: Atoms, Molecules and Radicals
5: Language of Chemistry
6: Metals and Non-metals
7: Air and Atmosphere
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Solutions for Chapter 3: Elements, Compounds and Mixtures
Below listed, you can find solutions for Chapter 3 of CISCE Selina for Concise Chemistry [English] Class 7 ICSE.
Selina solutions for Concise Chemistry [English] Class 7 ICSE 3 Elements, Compounds and Mixtures Exercise I
Write the symbols of helium, silver, krypton, antimony, barium.
Write the names of following elements Na, C, Kr, U, Ra, Fe, Co.
Define: Compounds
Define: Elements-
Name the main metal present in the following :
Haemoglobin
Name the main metal present in the following:
Chalk
Name the main metal present in the following:
Chlorophyll
Name the main metal present in the following:
Chocolate wrappers
Give four examples of non-metallic elements.
What do you understand by :
Metalloids
What do you understand by :
Noble gases
Select elements and compounds from the following list: Iron, plaster of paris, chalk, common salt, copper, aluminium, calcium oxide, cane sugar, carbon, silica, sodium sulphate, uranium, potassium carbonate, silver, carbon dioxide.
Selina solutions for Concise Chemistry [English] Class 7 ICSE 3 Elements, Compounds and Mixtures Exercise II
State four difference between compounds and mixtures.
What are the characteristic properties of a pure substance? Why do we need them?
Give two examples of the following :
Solid + Solid mixture
Give two examples of the following:
Solid + Liquid mixture
Give two examples of the following:
Liquid + Liquid mixture:
Define: Evaporation
Define:- Filtration
Define :- Sublimation
Define :- Distillation
Define :- Miscible liquids
Define :- Immiscible liquids
Name the process by which the components of following mixtures can be separated.
- Iron and sulphur
- Ammonium chloride and sand
- Common salt from sea water
- Chaff and grain
- Water and mustard oil
- Sugar and water
How will you separate a mixture of common salt, chalk powder and powdered camphor? Explain.
How is distillation more advantageous than evaporation?
What is chromatography?
Why is it named so?
What are the advantages of chromatography?
Name the simplest type of chromatography?
On what principle is this method based?
What is meant by stationary phase and mobile phase in chromatography?
On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used
Sublimation
On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used
Filtration
On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used
Sedimentation and decantation
On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used
Solvent extraction method
On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used
Magnetic separation
On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used
By using a separating funnel
On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used
Fractional distillation :
Selina solutions for Concise Chemistry [English] Class 7 ICSE 3 Elements, Compounds and Mixtures Objective type questions
Fill in the blank
_______ are made up of same kind of atoms.
Fill in the blank:
________ and _______ are pure substances.
Fill in the blank
In a _______ the substances are not combined chemically.
Fill in the blank
Clay is separated from water by the method called ______
Fill in the blank:
_________ is a process to obtain a very pure form of a solid dissolved in a liquid.
Fill in the blank
Camphor and ammonium chloride can _______.
Give one word answer
The solid particles which remain on the filter paper after the filtration
Give one word answer
The liquid which evaporates and then condenses during the process of distillation
Give one word answer
The process of transferring the clean liquid after the solid settles at the bottom of the container
Give one word answer
The process by which two miscible liquids are separated
Selina solutions for Concise Chemistry [English] Class 7 ICSE 3 Elements, Compounds and Mixtures Multiple choice questions
Select the correct alternative from the choices given for the following statement:
A pure liquid is obtained from a solution by :
evaporation
distillation
Alteration
crystallisation
Select the correct alternative from the choices given for the following statement:
Components of crude petroleum can be separated by
distillation
evaporation
filtration
fractional distillation
Select the correct alternative from the choices given for the following statement:
Example of a homogeneous mixture is
tap water
distilled water
sand and water
water and oil
Select the correct alternative from the choices given for the following statement:
In chromatography the filter paper is
stationary phase
mobile phase
mixture
none of the above
Select the correct alternative from the choices given for the following statement:
A set of mixture is
ink, honey, ice cream, milk
tapwater, gold, common salt, alloy
milk, brass, silver, honey
butter, petroleum, tapwater, iron
Selina solutions for Concise Chemistry [English] Class 7 ICSE 3 Elements, Compounds and Mixtures Additional questions 1
Fill in the blank
A pure substance has definite _______ and constant _________.
Fill in the blank
Mixtures can be ________ or _______
Fill in the blank
Use of a __________ to separate the components of a mixture of solids is based on the difference in the size of the components.
Fill in the blank.
_________ is used when the constituents of a mixture of solids have a difference in their weights.
Fill in the blank
Iodine, camphor, naphthalene, ammonium chloride and dry ice are some substances that _________
Selina solutions for Concise Chemistry [English] Class 7 ICSE 3 Elements, Compounds and Mixtures Additional questions 2
Filtration is a method used to separate fine particles of solid from a liquid.
Loading is basically speeding up _____.
Name the techniques used to separate a solid from its solution.
A separating funnel can be used for separating a mixture of immiscible liquids. True or false?
True
False
During centrifugation, solid particles of the mixture move towards the bottom. True or false?
True
False
Selina solutions for Concise Chemistry [English] Class 7 ICSE 3 Elements, Compounds and Mixtures Additional questions 3
The constituents of a mixture are present in a fixed ration.
a fixed ratio
a variable ratio
the ratio of 2:1
none of these
Solutions are
heterogeneous mixture
compounds
homogeneous mixture
elements
The methods of separating components of a given mixture are based on the
physical properties and state of the components
colour of the components only.
state of the components
none of these
Tick the most appropriate answer
Winnowing is the method used to separate
chaff from grain.
stones from rice
oil from water
salt from sand
Tick the most appropriate answer.
During filtration the substance left behind on the filter paper is called ________.
distillate
filtrate
sublimate
residue
Tick the most appropriate answer.
Loading is a process in which
impurities become heavy and sink to the bottom.
impurities float on the top.
impurities vaporize.
none of these
Tick the most appropriate answer
Fractional distillation is used to separate liquids having an appreciable difference in their ______________.
size and shape
solubility
boiling points.
none of these
Tick the most appropriate answer.
The different constituents of ink are separated by
handpicking.
paper chromatography
filtration
magnetic separation
Selina solutions for Concise Chemistry [English] Class 7 ICSE 3 Elements, Compounds and Mixtures Additional questions 4
Fill in the blank
A ________ substance has only one kind of matter.
The composition and properties of a _________ mixture is uniform throughout.
Fill in the blan
An ________ is a homogeneous mixture of two or more metals.
Fill in the blank
Chalk powder dissolved in water is an example of a Chalk powder dissolved in water is an example of a _________.
A _______ is formed when one liquid is dispersed as tiny droplets throughout another liquid
Fill in the blanks.
Immiscible liquids are separated by using a ________.
Selina solutions for Concise Chemistry [English] Class 7 ICSE 3 Elements, Compounds and Mixtures Additional questions 5
Write true or false
All pure substances have characteristic melting and boiling points.
True
False
Write true or false
Milk is an emulsion.
True
False
Write true or false
A heterogeneous mixture has a uniform composition throughout the mixture.
True
False
Write true or false
The constituents of a mixture can only be separated by chemical means.
True
False
Write true or false
Handpicking can be used as a separation technique if the particle size of the constituents of the mixture is the same.
True
False
Selina solutions for Concise Chemistry [English] Class 7 ICSE 3 Elements, Compounds and Mixtures Additional questions 6
Match the columns.
| Column A | Column B |
| 1. To separate grain from chaff | a. filtration |
| 2. To seperat sawdust from water | b. sedimentation and decantation |
| 3. To separate iodine from sodium chloried | c. winnowing |
| 4. To separate iron fillings from sand | d. sublimation |
| 5.It is used to separate sand and water | e.magnetic separation |
| f. handpiicking |
Selina solutions for Concise Chemistry [English] Class 7 ICSE 3 Elements, Compounds and Mixtures Additional questions 7
Differentiate between the following.
solution and suspension
Differentiate between the following.
Supernatant liquid and Fill rate
Differentiate between the following
Filter Paper and Alum
Selina solutions for Concise Chemistry [English] Class 7 ICSE 3 Elements, Compounds and Mixtures Additional questions 8
Is food that we eat a mixture ?
Name two methods by which solid-solid mixtures can be separated.
How can you separate iron metal from non-magnetic impurities ?
Name the technique that you use if only the solid component of a solution is required.
Name the substance you will add to speed up sedimentation.
Name the different types of chromatographic techniques.
Selina solutions for Concise Chemistry [English] Class 7 ICSE 3 Elements, Compounds and Mixtures Additional questions 9
What is the difference between a pure substance and a mixture ?
What are the different types of mixtures ?
Why is filtration a better technique than sedimentation and decantation ?
How is distillation method different from evaporation?
What is centrifugation ? Also write the principle on which it works.
Solutions for 3: Elements, Compounds and Mixtures
Selina solutions for Concise Chemistry [English] Class 7 ICSE chapter 3 - Elements, Compounds and Mixtures
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Concepts covered in Concise Chemistry [English] Class 7 ICSE chapter 3 Elements, Compounds and Mixtures are Fractional Distillation Method, Centrifugation Method, Matter (Substance), Natural substances, Separation of Constituents of the Mixtures with More than Two Constituent, Pure Substances, Chromatography Method, Impure Substance, Elements, Types of Element: Metals, Types of Element: Non-metal, Type of Element: Metalloid, Type of Elements: Noble Or Inert Gases, Symbols Used to Represent Atoms of Different Elements, Compound, Mixture, Types of Mixtures, Differences Between Elements, Compounds, and Mixtures, Formation of Mixtures, Separation of Mixtures, Methods of Separation, Winnowing Method, Handpicking Method, Magnetic Separation Method, Gravitation Method, Sublimation Method, Solvent Extraction (Using a Separating Funnel Method), Sedimentation Method, Decantation Method, Filtration Method, Evaporation Method, Crystallisation Method, Simple Distillation Method.
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