Table of Contents
- 1 What happens when you stretch a rubber?
- 2 How does rubber stretch?
- 3 Why stretching of rubber band is a physical change?
- 4 What happens to the rubberband?
- 5 Why stretching of rubber is a physical change?
- 6 Is stretching of rubber band is not a physical change?
- 7 What happens during the stretching of a rubber?
- 8 Why does stretching a rubber band increase entropy?
What happens when you stretch a rubber?
A rubber band is an elastic material in nature. When stretched, it changes its shape and when the applied force is removed, it regains its original shape. That is why a rubber band changes its shape even though it is a solid. Also, if excessive force is applied then the rubber band would break.
How does rubber stretch?
The reason rubber bands stretch is because when you pull on the rubber band, the polymers (which are normally coiled up more or less at random) get stretched lengthwise and the rubber band is lengthened. This will cause the polymers to stretch and the rubber band to lengthen.
What type of change is stretching of rubber?
Explanation: in physical change no new substance is formed but in chemical change new substance formed. stretching a rubber band no new substance is formed so it is physical change.
Can a rubber change its shape on stretching?
A rubber band can change its shape on stretching but it is a solid. This happens because pressure is applied on the band which makes it to change the shape and it gains its original shape when released.
Why stretching of rubber band is a physical change?
Stretching a rubber band is a physical change because the size of the rubber band changes. The color of the rubber band sometimes can change as well when it is stretched. However, the material that the rubber band is made of does not change. The rubber band is still rubber.
What happens to the rubberband?
It changes shape when extended and returns to its original shape when the applied force is withdrawn. That is why, after being a solid, a rubber band changes shape. Furthermore, if too much stress is applied, the rubber band will snap.
Can rubber be stretched?
Rubber elasticity refers to a property of crosslinked rubber: it can be stretched by up to a factor of 10 from its original length and, when released, returns very nearly to its original length. This can be repeated many times with no apparent degradation to the rubber.
What causes rubber to expand?
The rubber band actually expands when it gets colder! This occurs because of the unusual polymer structure of rubber. When the long chains get hotter and vibrate, they actually shorten, causing the material to contract. When the chains cool down, they relax and stretch out, causing the material to expand.
Why stretching of rubber is a physical change?
Is stretching of rubber band is not a physical change?
The stretching of rubber band is not a physical change it is just the rubber band is having the elastic property. EXPLANATION: The kinetic property or elastic property makes it expand on stretching without any changes to be faced.
What about a rubber band can it change its shape on stretching is it a solid Byjus?
b) Can a rubber band change its shape on stretching? A force when acted on a rubber band will help to change the shape, and it gets backs to original state also. It is elastic in property. It has the ability to regain the shape as it is by using a force.
Why does rubber stretch even though it’s a solid?
The rubber band is considered as solid because as we apply force and stretch the rubber band it changes its shape and gets elongated but after releasing the force, it moves back to its original shape. This property of rubber is known as elasticity. Therefore, the correct option is D.
What happens during the stretching of a rubber?
Just rapid stretching to a point and holding it raises the entropy initially as the molecules are excited and after the molecules of rubber band settle in their new positions, entropy drops to initial. The entropy of the universe, though, increases.
Why does stretching a rubber band increase entropy?
Heating the rubber band contracts it. Therefore, according to LeChatelier’s principle, stretching the rubber band MUST increase it temperature, because by getting hotter it tends to contract, resisting the stress of stretching. Slow stretching and relaxing of a rubber band has no effect on entropy of band as neither heat is generated nor supplied.
How does the temperature of a rubber band change?
These long chains are called polymers, which can behave in surprising ways when you heat or cool them. In this activity you will change the temperature of a rubber band using hot water and ice water.
How is elasticity a mechanical property of rubber?
Elasticity is the mechanical property of a material to return to its original shape where Tensile Set is the amount on extension remaining after being stretched. A rubber band would have a low Tensile Set percentage. After stretched it relaxes close to, if not exactly to, its original length. Now take a piece of Teflon and stretch it.