Even if we cut out the stitches, some of the parts of the fabrics can not be undone. We can bring back the initial fabric out of the piece of the dress. Now once the dress is stitched, can the process be reversed? Of course not. Firstly as only the shape and size of the fabric are altered, it is a physical change. Since the dress is made of fabric, its chemical nature would be the same. Stitching dress out of a piece of fabricįor stitching a dress out of a piece of fabric, it has to be in different shapes. It brings no change in the atomic structure or composition of wood and graphite. The sharpener only cuts the wood or graphite of which the pencil is made. Secondly, since the process can not be undone, the pencil size can not be increased it is irreversible. The change in the size of the pencil makes it a physical change. When we sharpen the pencil every time, its size gets reduced. Hence it is also one of the physical irreversible change examples. But that’s not the reality, the shape and size remain distorted to some extent, and the exact original piece of paper can not be restored. Some might question that by sticking the paper strips with tape, we can recover the paper. Now once the paper is shredded into strips, it becomes impossible to bring back the original sheet. A sheet of paper is changed into strips of paper. We all know that shredding or tearing paper is a physical change, as only the size and shape of the paper are changed without altering its chemical composition.
So we can say that pulverizing a rock is one of the physical irreversible change examples. Further, once the rock is crushed down, it can not be undone that is, we can not bring it back to its original position. Therefore, pulverizing a rock is classified as a physical change. The rock gets changed into powder form, but the chemical reactivity before and after the pulverization remains the same. Pulverizing a rockīreaking down the rocks into smaller and minute particles by either crushing, grinding, or beating them is known as pulverizing. The growth of a tree leads to stretching and growth of its branches and heights hence it is also a physical change since we can not reverse and bring a seedling or a small plant back from a tree, so it is an irreversible change. It is an example of both physical and chemical change as for the growth of the tree, a chemical reaction such as photosynthesis occurs. The growth of a small plant into a big tree is a unique chance. So broken glass is an example of irreversible physical change. Even if we try to weld the glass to join the pieces, we won’t get the exact bowl. Of course, we can not bring back the bowl. But can we get back the bowl from the shattered and broken pieces of glass? The answer would be no. We can find that the glass’s internal energy and chemical reactivity remains the same.
The small pieces of glass and the bowl as a whole are of the same material. When we drop a bowl made of glass, it accidentally gets broken into many smaller pieces. Once the cutting is done, it becomes a permanent change. Chopping a tree into small pieces of wood or logs is an irreversible change as we cannot obtain the whole tree back from these logs. But it is not a temporary change that is not reversible. Hence it is an example of physical change.
It is clearly seen that only the size and shape are changed. The chemical elements of the wood and the logs are just the same. On chopping trees to form logs, there is no involvement of internal energy. This is one of the most common physical irreversible change example. Cutting trees into log is a physical change
0 kommentar(er)
