Courses
Courses for Kids
Free study material
Offline Centres
More
Store Icon
Store

NCERT Solutions for Class 7 Science Chapter 5 Physical and Chemical Changes

ffImage
widget title icon
Latest Updates

NCERT Solutions for Class 7 Science Chapter 5 Question Answers - FREE PDF Download

Get the comprehensive study with Vedantu through the physical and chemical changes class 7 NCERT Solutions. This gives access to the class 7 science chapter 5 PDF elucidating fundamental principles crucial for understanding the subject's intricacies.

toc-symbol
Table of Content
1. NCERT Solutions for Class 7 Science Chapter 5 Question Answers - FREE PDF Download
2. Glance on NCERT Solutions for Class 7 chapter 5 Science Physical and Chemical Changes
3. Access NCERT Solutions Class 7 Science Chapter 5 Physical and Chemical Changes
4. Topics Covered in Science Class 7 Chapter 5 Physical and Chemical Changes
5. Benefits of NCERT Solutions for Class 7 Science Chapter 5- Physical and Chemical Changes
6. Important Study Material Links for Class 7 Science Chapter 5 - Physical And Chemical Changes
7. Conclusion
8. NCERT Solutions for Class 7 Science - Other Chapter-wise Links
9. Important Related Links for NCERT Class 7 Science
FAQs


By accessing class 7 science chapter 5 questions and answers, students gain comprehensive insights into the core concepts such as physical changes, chemical changes, rusting of iron, and more outlined in the NCERT Solutions for Class 7 Science curriculum. Check out the revised CBSE Class 7 Science Syllabus and get started with Vedantu to embark on a journey of academic excellence.


Glance on NCERT Solutions for Class 7 chapter 5 Science Physical and Chemical Changes

  • You can opt for NCERT Solutions for Science Class 7 physical and chemical changes for Upcoming Exams, and you can find the solutions for all the science chapters below.

  • In Science Class 7 chapter 5 science, you will explore physical changes, chemical changes, and rusting of iron. 

  • Class 7th science chapter 5 question answers opens with several instances of changes that occur every day in our environment. 

  • The first section of class 7th Science chapter 5 employs five distinct tasks to explain what the word "physical changes" means. 

  • In class 7 science chapter 5 question answers, you will notice the formation of one or more chemical substances.

Access NCERT Solutions Class 7 Science Chapter 5 Physical and Chemical Changes

1. Classify the changes involved in the following processes as  physical or chemical changes:

  1. Photosynthesis

  2. Dissolving sugar in water

  3. Burning of coal

  4. Melting of wax

  5. Beating aluminium to make aluminium foil.

  6. Digestion of food

Ans: Physical properties of a substance are shape, size, color and state if the substance undergoes a change in its physical properties, then it’s called a physical change. 

One or more new substances are formed in the chemical change. 

Physical change - Dissolving sugar in water, melting of wax, and beating aluminium to make aluminium foil.

Chemical change – Photosynthesis, Burning of coal, Digestion of food.


2. State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.

  1. Cutting a log of wood into pieces is a chemical change.  

Ans: False. Cutting a log of wood into pieces is a physical change.


  1. Formation of manure from leaves is a physical change.  

Ans: False. The formation of manure from leaves is a chemical change.


  1. Iron pipes coated with zinc do not get rusted easily.

Ans: True


  1. Iron and rust are the same substance.  

Ans: False. Iron and rust are different substances.


  1. Condensation of steam is not a chemical change.

Ans: True


3. Fill in the blanks in the following statements:

  1. When carbon dioxide is passed through lime water, it  turns milky due to formation of ----------.

Ans: When carbon dioxide is passed through lime water, it turns  milky due to  formation of calcium carbonate.

 

  1. The chemical name of baking soda is ----------.

Ans: The chemical name of baking soda is sodium hydrogen  carbonate.


  1. Two methods by which rusting of iron can be prevented  are ---------- and ----------.

Ans: Two methods by which rusting of iron can be prevented are painting and galvanizing.

 

  1. Changes in which only ---------- properties of a substance change are called physical changes.

Ans: Changes in which only physical properties of a substance  change are called physical changes.

 

  1. Changes in which new substances are formed are called ---------- changes.

Ans: Changes in which new substances are formed are called chemical changes.

 

4. When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it?  Explain.

Ans: It’s a chemical change because a new substance carbon dioxide  gas is formed. When baking soda is mixed with lemon juice, then bubbles are formed with the evolution of carbon dioxide gas.

 

5. When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar  process in which both the chemical and physical changes take place.

Ans: First the wax of the candle melts, then vaporizes and burns. Here Melting of wax is a physical change as no new substance is formed and the melted wax can be converted back.

When the wax burns, two new substances are formed which are smoke and carbon dioxide. So, it’s a chemical change.

In LPG both the chemical and physical changes take place. As we know LPG is present as liquid form in the cylinder. 

Here the physical change occurs when it comes out of the cylinder. That time it converts into gaseous form. 

When that gas burns in air it undergoes chemical change.

 

6. How would you show that the setting of curd is a chemical change?

Ans: When some sour substance is added to milk and kept overnight, it turns into curd. Once the curd is formed, then there is no way curd can be converted back into milk. Both milk and curd are different and they have different properties So, formation of curd is a  chemical change.

 

7. Explain why burning of wood and cutting it into small pieces are  considered as two different types of changes.

Ans: Here chemical change is burning of wood  and cutting of wood is a physical change. Burning of wood produces ash and smoke that means two new substances are formed. Hence the properties of wood are changed. So, it’s a chemical change. When a log of wood is cut into small pieces, it’s a physical change. Each small piece  bears the properties of wood and there’s no new substance formed.

 

8. Describe how crystals of copper sulphate are prepared.

Ans: Take a water filled beaker and add a few drops of dilute Sulphuric acid into it. Then the water is heated, when it starts boiling slowly add copper sulphate powder during this process stir continuously. Add more copper sulphate till no more powder can be dissolved. The solution is now filtered and allowed to cool down. Crystal of copper sulphate slowly forms at the rock bottom of the beaker. By the method of crystallization Crystals of copper sulphate can be prepared.

 

9. Explain how painting of an iron gate prevents it from rusting.

Ans: Rusting  is the process in which a piece of iron  in the open air acquires a  film of brownish substance called rust. For rusting, iron should be in contact with both air and moisture. When an iron gate is painted then the layer of paint cuts the  contact between air, moisture and iron. Thus, it prevents rusting. So, when we paint an iron gate it prevents rusting.

 

10. Explain why rusting of iron objects is faster in coastal areas than in deserts.

Ans: Rusting  is the process in which a piece of iron  in the open air acquires a  film of brownish substance called rust. Both air and moisture are necessary for rusting of iron objects. Due to the presence of sea,  In coastal areas there is more moisture in the air. But, in the desert there’s a scarcity of water and hence air is nearly dry. This is the reason why rusting is faster in coastal areas than in deserts.

 

11. The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder it exists as liquid. When it comes out from the cylinder it becomes a gas (change A) then it burns (change B). The following statements pertain to these changes. Choose the correct one.

(i) Process – A is a chemical change.

(ii) Process – B is chemical change.

(iii) Both processes A and B are chemical changes.

(iv) None of these processes is a chemical change.

Ans: (ii) Process – B is a chemical change.

In a chemical change one or more new substances are formed. 

 

12. Aerobic bacteria digests animal waste and produces biogas (change – A). The biogas is then burnt as fuel (change - B). The  following statements pertain to these changes. Choose the correct one.

(i) Process – A is a chemical change.

(ii) Process –B is a chemical change.

(iii) Both processes A and B are chemical changes.

(iv) None of these processes is a chemical change.

Ans: (iii) Both processes A and B are chemical changes.

In a chemical change one or more new substances 


Topics Covered in Science Class 7 Chapter 5 Physical and Chemical Changes

List of Topics Covered in Science Chapter 5 Class 7

Topics

Physical Change

Chemical Change

Rusting of Iron

Crystallisation


Benefits of NCERT Solutions for Class 7 Science Chapter 5- Physical and Chemical Changes

Revising NCERT concepts and exercises is the best way to score good marks in exams. You just need to follow the solution pattern of Vedantu and you can rest assured that you are on the right track. These solutions help you with correct answers as well as serve as a step-by-step NCERT guide for the students having trouble understanding the chapters. Some notable features are:

  • You can download the class 7 science chapter 5 questions and answers PDF at any time at your convenience. 

  • All the solutions for physical and chemical changes class 7 questions and answers prepared by Vedantu experts are correct. 

  • In Science Class 7 chapter 5 science, you will explore physical changes, chemical changes, rusting of iron, and more to get all the answers and clear doubts.

  • Class 7th science chapter 5 question answers opens with several instances of changes that occur every day in our environment, ensuring to learn new concepts related to this chapter.

  • All important points and step-by-step patterns for class 7 science chapter 5 question answers are mentioned in the content and the FREE PDF. 

  • Work hard and keep revising all the solutions from Vedantu solution class 7th science chapter 5 PDF.


Important Study Material Links for Class 7 Science Chapter 5 - Physical And Chemical Changes



Conclusion

NCERT Solutions for Science Chapter 5 class 7 physical and chemical changes provides students with a profound understanding of the fundamental concepts of chemistry and the transformations matter can undergo. This chapter explores the distinctions between physical and chemical changes, offering comprehensive explanations and practical examples. The class 7th science chapter 5 question answers empower students to appreciate the world of science by explaining everyday phenomena and reactions.


NCERT Solutions for Class 7 Science - Other Chapter-wise Links

Dive into our collection of FREE PDF links offering other chapter-wise NCERT solutions, prepared by Vedantu Experts to help you understand and master fundamental scientific concepts.




Important Related Links for NCERT Class 7 Science

Access these essential links for NCERT Class 7 Science, offering comprehensive solutions, study guides, and additional resources to help students master language concepts and excel in their exams.


FAQs on NCERT Solutions for Class 7 Science Chapter 5 Physical and Chemical Changes

1. What is a physical and chemical change according to class 7 chapter 5 science?

Physical Change: Any change in a substance’s physical properties like shape, size, colour etc. is said to be a physical change. It is generally a reversible change, and no new substance is formed during this.


Chemical Change: When a substance combines with any other substance to form a new substance or when it undergoes a chemical reaction, the change that occurs is known as a chemical change. It is generally a non-reversible change.

2. What is a chemical change? Write a short answer as stated in class 7 physical and chemical changes.

When a substance combines with any other substance to form a new substance or when it undergoes a chemical reaction, the change that occurs is known as a chemical change. It is generally a non-reversible change. 


These changes are generally termed chemical reactions. Some examples of chemical change are as follows;

  • Rusting of Iron.

  • Ripening of fruits.

  • Photosynthesis and respiration in living organisms.

  • Digestion of food in living organisms.

  • Curdling of milk.

3. How many questions are present in class 7th science chapter 5 question answers?

Chapter 5 of NCERT Solutions for Class 7 Science comprises a total of 12 questions, among which 3 questions are short-form answers and the rest 9 questions are long-form answers. For extended learning, Vedantu has provided the solutions to the questions free of cost, which are a part of the Activities and Projects mentioned in the textbook. There are a total of 4 questions from this extended learning.

4. What are the important topics in class 7th science chapter 5?

The important topics covered in Chapter 5 of Class 7 Science are physical changes and chemical changes. The distinction between physical and chemical changes and the results obtained after these changes are covered in this chapter. There are questions When a candle is lit, it undergoes both physical and chemical changes:

  • Physical change: wax melting, melted wax vapourisation

  • Chemical change: The combustion of wax vapours produces carbon dioxide, heat, and light.

5. When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place, according to class 7 science chapter 5 question answers.

When a candle is lit, it undergoes both physical and chemical changes:

  • Physical change: wax melting, melted wax vapourisation

  • Chemical change: The combustion of wax vapours produces carbon dioxide, heat, and light.

When LPG flows out of the cylinder and is transformed from liquid to gaseous state, a physical change occurs, and a chemical change occurs when the gas burns in the air.


To do well on tests, you should go through all the NCERT questions and obtain a thorough understanding of all of Chapter 5 of Class 7 Science provided by Vedantu on its website (vedantu.com).

6. How can I identify if a change is physical or chemical from physical and chemical changes class 7 questions and answers?

The solutions will provide tips to recognize the type of change. Look for signs like the formation of a new substance (gas, precipitate, color change), the evolution of heat or light, or permanent changes in properties.

7. Can a physical change become a chemical change, and vice versa discussed in class 7 science chapter 5 questions and answers?

The solutions will clarify that some physical changes can be reversed (tearing paper can be glued back), while others might not (crushing a pill). Chemical changes are generally irreversible.

8. Are there any everyday examples of physical and chemical changes from class 7 science chapter 5?

The solutions might provide examples like melting chocolate (physical), cooking an egg (chemical), or dissolving sugar in water (physical).

9. The chapter mentions burning a candle. What kind of changes occur here?

The solutions will explain that burning a candle involves both physical and chemical changes. The wax melts (physically), but the wax vapour undergoes a chemical reaction with oxygen, releasing heat, light, and carbon dioxide (chemical).