Why wool being knitted into a sweater is a physical change?
Answer: In a physical change no new substance is formed . in this case when the wool is knitted into a sweater only the appearance is changed no new substance is formed . we can get back the wool from the sweater and thus it is a physical change .
Is Woollen yarn to knitted sweater a reversible change?
In case of woolen yarn to a knitted sweater, the sweater can be changed into woolen by just taking out the tread so yes it is also a reversed change.
When a woolen yarn is knitted to get a sweater The change can be classified as <UNK> <UNK>?
When a woolen yarn is knitted to get a sweater, the change can be classified as physical change. Q I. 1.
Which of the following are chemical changes and which physical give reason?
Burning of coal in air is a chemical change because the burnt coal cannot be obtained back and it is an irreversible change. Preparation of a cake is a chemical change as all the raw materials that go inside the mixture get cooked after baking and the process cannot be reversed.
Can Yam to knitted sweater be reversed?
Answer: Woollen yarn to knitted sweater is a reversible reaction.
Can you reverse straight string to coiled string?
Answer: The ‘straight string’ to a ‘coiled string’ is reversible. Explanation: Coiling a straight string into a coiled one can be done but this process can be done only under a high pressure, then it becomes reversible.
Which one of the change given below Cannot be reversed?
A change which cannot be reversed is called irreversible change. 2. Setting of cement is an example of a irreversible change.
Why is folding of a paper said to be a physical change?
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.