NCERT Solutions for Class 6 Science Chapter 6 – Changes Around us, contains solutions to various questions in Exercise for Chapter 6. At the end of the Solutions, all the keywords and Notes which are important to understand NCERT Solutions for Class 6 Science Chapter 6 – Changes Around us, have been explained in a simple and easy to understand manner. We are providing NCERT Solutions for Class 6 all subjects which can be accessed by clicking here.
NCERT Solutions for Class 6 Science Chapter 6 – Changes Around us – Video Explanation
We see changes in every area of life. A seed germinating into a plant, a kid growing into an adult and the raw vegetables getting cooked, our life progresses with these changes happening all the time.
In this lesson, you will learn about reversible and irreversible changes.
NCERT Solutions for Class 6 Science Chapter 6 – Changes Around us – Solutions to Question 1 to 3
NCERT Solutions for Class 6 Science Chapter 6 – Changes Around us – Solutions to Question 4 to 7
NCERT Solutions for Class 6 Science Chapter 6 – Changes Around us – Definition of the Keywords – Changes, Contraction, Evaporation, Expansion, Melting
Science Chapter 6 Changes Around us, Exercises includes – Questions/ Answers, which helps you to understand the topic covered in the Changes Around us, in a better manner to help you to score good marks in your examinations.
NCERT Solutions for Class 6 Science Chapter 6 – Changes Around us – NCERT Exercises
To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Answer 1: –
Yes, the process can be reversed by unfolding the dress.
You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?
No, this change can not be reversed as the toy is damaged permanently.
Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
A drawing sheet changes when you draw a picture on it. Can you reverse this change?
Answer 4: –
The nature of change depends on the medium used to draw the picture. If the picture is drawn by a pencil, it can be easily erased and we can reverse the change. However, if we use colors or pens, the change is irreversible.
Give examples to explain the difference between changes that can or cannot be reversed.
Answer 5: –
The changes that can be reversed are reversible changes, such as filling a glass of water, opening the lid of a container, wet clothes to dry clothes, etc.
The changes that affect the nature of an object permanently cannot be reversed. For example – boiling of egg, conversion of milk into curd, batter to idli, etc.
A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
Answer 6: –
The hardening of POP is due to a chemical change. Hence, it cannot be reversed.
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Answer 7: –
When the sun shines on the wet cement, it undergoes the process of dehydration to form a solid hard block. Since it is a chemical change, it cannot be reversed.
Topics Covered in Chapter 6 Changes Around us:-
- CAN ALL CHANGES ALWAYS BE REVERSED?
- COULD THERE BE OTHER WAYS TO BRING A CHANGE?
Important Terms Relevant to understand NCERT Solutions for Class 6 Science Chapter 6 – Changes Around us: –
Changes: The differences between the properties of an object at two different times are known as changes.
Contraction: The change in size of an object when it becomes smaller is known as contraction. Grapes dried to make resins contract when they lose water.
Evaporation: The conversion of water into its vapour is called evaporation. It occurs when heat is applied to the liquid.
Expansion: The change in size of an object when it becomes larger is known as expansion. Expansion can be observed in metals due to heat. A balloon expands when air is blown into it.
Melting: The conversion of solid into liquid due to heat is called melting. For example, Ice melts into water when kept at room temperature.