NCERT Solutions for Class 7 Science Chapter 6: Physical and Chemical Changes

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NCERT Solutions for Class 7 Science Chapter 6 Physical and Chemical Changes are provided in the article below. The important topics covered in this chapter are:

Physical changes
Chemical changes
Rusting of iron
Crystallization

Download PDF: NCERT Solutions for Class 7 Science Chapter 6 Physical and Chemical Changes

NCERT Solutions for Class 7 Science Chapter 6

NCERT Solutions for Class 7 Science Chapter 6 Physical and Chemical Changes are given below:

Class 7 Science Chapter 6 Physical and Chemical Changes: Important Topics

A Physical change is a temporary change that affects only physical properties such as shape, and size. It is said that, whenever a substance goes through a physical change, its composition remains the as it is despite its molecules being rearranged. A chemical change is a permanent change having both physical and chemical properties of a substance. It is said that whenever a substance goes through a chemical change, its molecular composition is completely changed.

Physical changes

Physical changes are defined as the changes affecting the form of a chemical substance, but not it is chemical composition. Physical changes are generally used to separate mixtures into their component compounds, but can not be used to separate compounds into chemical elements or simpler compounds.

Chemical changes

Chemical changes take place when a substance combines with another in order to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are known as chemical reactions which, in general, are not reversible except by further chemical reactions.

Rusting of iron

Rusting of iron is an oxidation reaction. The iron reacts with water and oxygen in order to form hydrated iron(III) oxide, which we perceive as rust. Iron and steel rust when they come into contact with water and oxygen – both are needed for rusting to occur.

Chapter Related Links:

Difference Between Physical and Chemical Changes	Chemical change	Difference between physical and chemical properties
Oxygen Cycle	Examples of Weak Acids	Noble Gases
Weak Base	Difference Between Acid and Base	Solvent Examples

Class 7 Science Additional Resources:

CBSE Class 7 Science NCERT Textbook	CBSE Class 7 Science Sample Paper	NCERT Solutions

CBSE X Related Questions

1.
Write chemical equations to show what happens when an acid reacts with a:
Write chemical equations to show what happens when an acid reacts with a:
(i) Metal
(ii) Base
(iii) Carbonate
Write the name of the main product formed in each case
View Solution
2.
In our houses we receive A.C. electric power of 220 V. In electric iron or electric heater cables having three wires with insulation of three different colours – red, black and green are used to draw current from the mains. What are these three different wires called? Name them colourwise. What is the potential difference between the red wire and the black wire? What is the role of the wire with green insulation in case of accidental leakage of electric current to the metallic body of an electrical appliance?
View Solution
3.
State the chemical property in each case on which the following uses of baking soda are based upon:
(i) As an antacid
(ii) As a constituent in making baking powder
(iii) In soda-acid fire extinguishers
View Solution
4.
Write one function each of the parts - (i) petals (ii) anther (iii) style and (iv) ovary of a bisexual flower.
View Solution
5.
Name the type of lenses required by the persons for the correction of their defect of vision called presbyopia. Write the structure of the lenses commonly used for the correction of this defect giving reason for such designs.
View Solution
6.
What is stainless steel? How is it prepared? Write one important property which makes it more useful in making cooking utensils as compared to its primary metal.
View Solution

View All

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NCERT Solutions for Class 7 Science Chapter 6: Physical and Chemical Changes

NCERT Solutions for Class 7 Science Chapter 6

Class 7 Science Chapter 6 Physical and Chemical Changes: Important Topics

Physical changes

Chemical changes

Rusting of iron

CBSE X Related Questions

1.
Write chemical equations to show what happens when an acid reacts with a:
Write chemical equations to show what happens when an acid reacts with a:
(i) Metal
(ii) Base
(iii) Carbonate
Write the name of the main product formed in each case

3.
State the chemical property in each case on which the following uses of baking soda are based upon:
(i) As an antacid
(ii) As a constituent in making baking powder
(iii) In soda-acid fire extinguishers

4.
Write one function each of the parts - (i) petals (ii) anther (iii) style and (iv) ovary of a bisexual flower.

5.
Name the type of lenses required by the persons for the correction of their defect of vision called presbyopia. Write the structure of the lenses commonly used for the correction of this defect giving reason for such designs.

6.
What is stainless steel? How is it prepared? Write one important property which makes it more useful in making cooking utensils as compared to its primary metal.

Similar Science Concepts

Comments

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NCERT Solutions for Class 7 Science Chapter 6: Physical and Chemical Changes

NCERT Solutions for Class 7 Science Chapter 6

Class 7 Science Chapter 6 Physical and Chemical Changes: Important Topics

Physical changes

Chemical changes

Rusting of iron

CBSE X Related Questions

1.Write chemical equations to show what happens when an acid reacts with a:Write chemical equations to show what happens when an acid reacts with a: (i) Metal (ii) Base (iii) Carbonate Write the name of the main product formed in each case

3.State the chemical property in each case on which the following uses of baking soda are based upon: (i) As an antacid (ii) As a constituent in making baking powder(iii) In soda-acid fire extinguishers

4.Write one function each of the parts - (i) petals (ii) anther (iii) style and (iv) ovary of a bisexual flower.

5.Name the type of lenses required by the persons for the correction of their defect of vision called presbyopia. Write the structure of the lenses commonly used for the correction of this defect giving reason for such designs.

6.What is stainless steel? How is it prepared? Write one important property which makes it more useful in making cooking utensils as compared to its primary metal.

Similar Science Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
Write chemical equations to show what happens when an acid reacts with a:
Write chemical equations to show what happens when an acid reacts with a:
(i) Metal
(ii) Base
(iii) Carbonate
Write the name of the main product formed in each case

3.
State the chemical property in each case on which the following uses of baking soda are based upon:
(i) As an antacid
(ii) As a constituent in making baking powder
(iii) In soda-acid fire extinguishers

4.
Write one function each of the parts - (i) petals (ii) anther (iii) style and (iv) ovary of a bisexual flower.

5.
Name the type of lenses required by the persons for the correction of their defect of vision called presbyopia. Write the structure of the lenses commonly used for the correction of this defect giving reason for such designs.

6.
What is stainless steel? How is it prepared? Write one important property which makes it more useful in making cooking utensils as compared to its primary metal.