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What type of change do we see when a folded paper is unfolded?
reversible change
SOLUTION: (i) Folding of a paper is a reversible change because paper can be unfolded to get it back.
Is cement a reversible change?
Answer: Due to water, cement hardens and its composition changes. Since it is a chemical change therefore it cannot be reversed.
Can the change in POP can be reversed?
Can the change in POP be reversed? Solution: No, the change in POP cannot be reversed because the plaster of Paris on getting mixed with water changes into a hard mass and form a new compound.
What kind of change is folding of paper?
Folding of a paper sheet: A paper can be folded or unfolded, and hence it is an example of physical change. Moreover, no new substance is formed in this process, so it is a physical change.
How do you describe the changes happened to a folded paper?
The folding of paper is a physical change. Paper is made up of cellulose molecules. Folding the paper does not alter the structure of cellulose. Any action which alters the structure of cellulose will be called a chemical change.
When you walk on a muddy road you mostly shorten the length of your dress by folding it is it reversible change or not?
Q1) To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed? Solution: Yes, this change can be reversed by unfolding the dress.
What type of change is mixing of cement and water?
Mixing cement with water is an irreversible change because we cannot get back the original cement even after boiling it. It is a chemical change.
What would happen to the cement bags if kept in waterlogged road?
(b) If the cement bags have been kept in waterlogged roads then the cement would have reacted with water to form a substance with other property and evolution of heat. Thus, the cement would have got wasted.
What is paper cutting and folding?
Paper Folding and Cutting is a process in which a transparent sheet is folded and then a few cuts or folds are made. Therefore, the figures symbolize the flow during which the paper is to be folded. The patterns from the cut will appear on all of the folds formed on the paper.
Why is folding of a paper said to be physical change?
folding of paper is a physical change because no new substance is formed . In a chemical change a new substance is formed.
What is changed when you tear cut and crumple the paper?
During the physical change neither the chemical composition nor chemical nature of the substance changes. For example:Tearing a paper is a physical change because when the paper is torn only the appearance of paper is changed. 3.No new substance is formed.