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