How does temp affect how much the rubber band stretch? And what is the reason behind (at a molucular level)?
117382
As the temperature increases, the stretching of the rubberband will increase. This is because there are intermolecular forces between the fibers of the rubber when it's unstretched. When it's heated, the particles start to vibrate more thus they expand. This causes a decrease in the magnitude of intermolecular forces so it will be easier to pull it now, same as it does in melting. This cause it to be more elastic.
726157
increases temperature and speeds up the centrifugal force between the molecules. Also it weakens the chemical bonding of the individual H2O^0 neutral molecules.
110839
temperature changes de amount of energy in molecules, which has a direct efect on the amount of light transmited through a  solution and, therefore, afects absorbance.  Also, in chemical analysis, the formation of colored compunds is necesary and if the correct temperature is not set, the compound doesn't form correctly. (just some reaction mechanisms from organic chemistry)\nThe AOAC method for testing nitrate content in water is a good example. If you don't give the reaction the correct temperature, the colored compound will never form and the test is invalid.
942030
How are Rubber Bands made :\n\na) Mixing & Compounding\n\nThe rubber is mixed with various chemicals in required proportions depending on rubber content. This compounded mixture is then strained to ensure that there are no extraneous materials in compounded material.\n\nb) Extrusion\n\nThe compounded rubber is then put into an extrusion machine. This extrudes the rubber into tubing form using specific die heads to achieve a required diameter and wall thickness. The tubing is then cut into lengths and put onto mandrels of the same size / diameter.\n\nc) Curing\n\nThe tubing now on mandrels is put into an autoclave (oven) to ensure tubing reaches it's set form. The tubing is then blown off the mandrels for passing to the cutting area.\n\nd) Cutting\n\nThe tubing is then fed into rotary cutters to cut into designated cut widths of rubber bands.
943484
I expect that you have the data on stretch as a result of tension. \na) The object is just at rest. Tension, T = W = m*g.\n\nb) T = W + m*a\n\nc) Tmax = W + m*a
85904
The response of polymers differs from one to another and beyond doubt it is vary complicated. Fortunately there are some references modeling this behavior. If you want more on this send me your questions at david_blear@yahoo.com
847146
who knows about the temp..\nprobably at elevated temps.\nhydrolysis, you need water and preferably with charge carrying species. ie dissolved salts.\n\nhave a look here:\nhttp://www.zahnisers.com/repair/blister/blister1.htm
960007
It's metal that you can set at a specific shape at higher than room temperature.\n\nWhen cooled it can be pulled out of shape but when heated again goes back to how it was set when heated for the first time.\n\nSee http://jchemed.chem.wisc.edu/JCESoft/CCA/CCA2/MAIN/MEMORYM/CD2R1.HTM
428293
there are many ways to correct this depending on what the problem is.  \nIf the elastic is old, it will not draw up (the rubber in the elastic has dried out) like an old rubber band.\n\nuse a shorter length of elastic\n\nthe elastic may not be strong enough(like using pantie ela. for a denim skirt) For your project there is a clear elastic that  you can find at Hancock fabric or Jo Ann Fabrics.  This is the elastic used in manufactured bating suits around the leg and back areas. Although light weight. it has INCREDIBLY DURABLE, 6" will stretch almost 2' and fully recover to original length.  Washable, safe in dryer, even w/ high heat. But do be careful not to get it to tight because it wont grow as some elastic will.
704009
Tempreture effects the volume and pressure of the gas inside the balloon.\nAccording the this formula (Pressure . Volume)=(nR)(Temp)\nby increaseing temp you are gonna have smaller pressure and volume(thus smaller balloon) and by increasing temp, you are gonna have higher pressure and volume(thus bigger/stiffer) balloon.  \nKeep in mind the effect of temp on the volume and the pressure of the gas or liquid inside the balloon depends on many factors such as the type of gas or liquid, what the balloon is made of and...
516732
Well, the temperature doesn't matter. What does matter is the concentration of the water outside of you. It's osmosis/diffusion. You have water in your body and there's water outside of you; but the water outside gonna have a higher concentration that the water inside of you. This is when you take into consideration that the water outside of you  will include dirt(some salts) and other chemicals like from your soap or shampoo, which is why it's concentration is higher. The whole process of your fingers shriveling-up is because the water inside of you leaves your body in attempt to balance the concentration outside to equal yours.
208178
That only happens when its cold bent because you're stretching the chemical bonds, which in turn destroys the color molecules....try heating the plastic before you bend it !!! See below:\n\n[PDF] Plastic MaterialsFile Format: PDF/Adobe Acrobat - View as HTML\nalways carried out in the plastic window, making the bend characteristics ... Very prone to stress (coloured material turns white when it is cold bent). ...
782005
a) stretching - the objects "necks" or thins down\n\nb) compression - the objects "bellows" or gets fatter
60510
Yes, the amount of air affects how firm the outer part is. The more air, the more resistance to flex the skin has due to the pressure, the "bouncier" it will be.
860270
Hi - here are some ideas without seeing your actual data.  First - the system was too hot during transfer to  the membrane - be sure you aren't running it at too high  a voltage.   Second, not an issue with the  blot,  but with  the gel  - was it expired?  not fully polymerized? were the  wells free of debris when loading  samples?   sometimes with highly concentrated samples, especially cell lysates,  this  can  happen  because  of  viscosity  in t he  sample  (from  DNA for example). good  luck.
163367
Muscles are like chewing gum. If you try to stretch cold chewing gum you know it breaks easily. However, if the gum is warmed up through chewing, it becomes more pliable and is less likely to break.\nSo, warm up (Bike, slow jog, less intense movements of whatever exercise you'll be doing). Also, do your stretching at the end of your workout or practice.\nHope that helps!
402998
This is an interesting question.  I think tyba has the right idea.  I would say that higher temperatures lead to a more flexible ball, which in turn will lead to a more elastic collision with the ground.\n\nJust in case you don't know:\nA perfectly elastic collision is one in which the object has exactly equal and opposite momentum after the collision (no loss of kinetic energy).  A perfectly inelastic collision is one in which all kinetic energy is converted to another type of energy.  No real collision is either one of these, but rather somewhere on the spectrum between them.\n\nIn the case of the frozen ball, I would say that most of the energy is converted to thermal energy (heat).