A student cuts some fabric into two pieces. is this change prysical or chemical? (1 pot) | item
• It is a chemical change because there is no phase change.
• It is a chemical change because the size changes.
• It is a physical change because the process is reversible.
• It is a physical change because there is no reaction.
The correct answer is "It is a physical change because there is no reaction."
It is a physical change because there is no reaction.
To determine whether the cutting of fabric into two pieces is a physical or chemical change, we need to understand the differences between these two types of changes.
A physical change refers to a change in the physical properties of a substance without altering its chemical composition. This means that the substance remains the same at the molecular level.
On the other hand, a chemical change involves a reaction that results in the formation of new substances with different chemical properties. In a chemical change, the original substance is transformed into something new.
In the scenario you provided, the cutting of fabric into two pieces is a physical change. This is because cutting the fabric does not result in a change in its chemical composition. The individual fabric pieces retain the same properties as the original fabric.
Now, let's examine the given statements to understand why they are correct or incorrect:
1. It is a chemical change because there is no phase change.
This statement is incorrect because a phase change (such as melting, boiling, or freezing) is not necessary to determine whether a change is physical or chemical. Cutting fabric does not involve any change in its chemical composition.
2. It is a chemical change because the size changes.
This statement is incorrect because a change in size alone is not indicative of a chemical change. Physical changes can also result in a change in size or shape without altering the substance chemically. Cutting the fabric into two pieces is a physical change that affects its size.
3. It is a physical change because the process is reversible.
This statement is correct. In a physical change, the process can typically be reversed by some means, such as stitching the fabric pieces back together. Cutting fabric is reversible, as the pieces can be reattached by sewing or other methods.
4. It is a physical change because there is no reaction.
This statement is correct. Cutting fabric does not involve any chemical reactions. The fabric's chemical composition remains unchanged before and after the cutting process.
Therefore, the correct answer is: It is a physical change because the process is reversible.