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This is because the stretching does not change the chemical composition of the rubber band.
Rubber bands are made of cross-linked polymers, long chain molecules connected to each other, that initially exist in a coiled state. Stretching forces these chains to lengthen, and aligns them in the direction of the applied stress, without forcing them to undergo any chemical change.
Think about a whole mass of tangled yarn. When you pull the left and right sides of it, it will get longer and more of the yarn will be pointing from left to right, but the yarn will be the same yarn that initially was in the tangled state. Because it is the "same yarn" in the before and after states, it is a physical change.
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Is a glass breaking a chemical change?
A chemical change is when the molecules of an object / solution are changed. A physical change is when the object / solution is altered without molecular change. Breaking glass is a physical change.
Is size of an object a physical property a physical change a chemical property or a chemical change?
i am pretty sure it is a physical property! :)
What is an example of a physical change that can be reversed?
A reversible change is when something can turn back into its original shape for example when ice is melted it turns into a liquid but then you can freeze it into a solid again do the change is reversible because it can change back into its original starter which is the ice in this case. But if you make a cake it is not reversible because all of the mixture has mixed together and it turns into one object this is called a chemical change. Also a reversible change is a physical change! Hope this helped ;)
What do we call the tendency of a object to stay at rest or to stay in motion?
We use the term inertia to describe the resistance of an object to any change in its motion. If an object is not moving, it doesn't want to move. If it is moving, it doesn't want to change is speed or the direction it is moving. This is covered by Newton in his laws of motion.
Is crushing an aluminum can a physical irreversible change?
Yes. Physical change is when you change the appearance but not the actual object. Crushing an aluminum can is a physical change because you have only changed its shape, but not its chemical composition.
What is after a physical change?
a physical change is when the object changes in a way but it is still that same object Example: A piece of bread if u toast (burn) it it will still be bread
What forces enable an object to be in motion?
If an object is moving, no force is required to keep it moving. Forces are required to CHANGE its motion, for example, to speed it up, or to slow it down.
Is the size of an object a physical property or physical change?
An object's size is a physical property of the object.
Example of physical change in an object?
A physical change is a change which affects only the physical properties of an object, not its chemical properties. Examples include breaking glass, smoothing a rock with a sander, and freezing water. As long as a new substance is not created in a process, the process is a physical change.
What determines the change in direction of an object after it collides with another moving object?
the force or other moving object
Can a unbalanced force change an objects motion?
An unbalanced force can: change the speed an object moves at change the direction an object is moving cause an object to start/stop moving
If you change the mass of a moving object you change its?
density
How do you when an object is moving?
Change of position relative to another object
Why is change of color a physical change?
Because a physical change just alters the appearance of an object, where as a chemical change alters the texture or state of an object.
What are the different effects of forces on object?
force can change the shape and size of an object force can change the direction of an moving object force can make a stationary object move and make a moving object move faster force can slow down or completely stop a moving object
What changes and what doesn't change in a physical change?
The changes and constant features in a physical change depend on the object tested. The makeup of the object does not change but the visual may.
Can an object be accelerated if it is moving with constant speed if yes explain giving example?
Yes, it can. Perhaps the simplest example is when an object moves at constant speed, in a circle. In this case, the speed doesn't change; the velocity does.
