The rationale of the experiment is to determine how heat affects the elasticity of rubber bands. Rubber is known to be a natural polymer, because of this the chains in molecules in rubber bands are elastic, or in other words they stretch when they are pulled. When at room temperature, and stretched, the elastic polymers in rubber bands are known to stretch and return back to their original size when let go. But when heated, it is known that the movement of the molecules is looser so in other words the rubber band can stretch farther without snapping. The main goal of the experiment is to determine whether rubber bands are gradually worn down in appliances, knowing that we use rubber and heat in almost all home appliances, the experiment allows us to determine of the produce is worth our well earned money. …show more content…
The experimental hypothesis states: If a substantial amount of heat is applied to a normal rubber band and stretched it will stretch farther because of the rapid movement of the molecules when heated, allowing the polymers to stretch farther.
To correctly conduct the experiment the following steps and procedures need to be followed,
Gather Materials
Heat water to desired temperature on stovetop. (check temperature using thermometer.)
Use scissors to cut the rubber band so that it is a straight line.
Tie one end of the rubber band to the stick on the top of the cylinder, tie the other to the weight
Pour the water into the graduated cylinder
Slowly submerge the rubber band into and the weight into the water
After 1 minute in the water measure the rubber bands stretch.(Check water temperature again using thermometer)
Record results.
Repeat steps 1-8 2 more times with desired temperature
Repeat steps 1-9 2 more times desired temperature
Repeat steps 1-9 2 more times with desired
The purpose of the experiment is to determine the ID of an unknown diprotic acid by establishing its pKa values. The first phase is to determine the unknown diprotic acid by titration, which is a technique where a solution of known concentration is used to determine the molecular weight. While the second phase involved seeing how much NaOH needed to standardize diprotic acid.
Problem/Question- How much will the shape, size, and color change if you put it in water, salt water, Kool -aid and chlorine overnight?
Step 4: Pull the clamping handles present on either ends of the machine down, and clamp the sheet metal.
The data which was collected in Procedure A was able to produce a relatively straight line. Even though this did have few straying points, there was a positive correlation. This lab was able to support Newton’s Law of Heating and Cooling.
Stiffness The effect of this additive of the polymer in terms of stiffness is that it affects the polymer in a good way. This is because it makes the polymer stiff and more tough when it is made.
tube 1, which was at 0° C produced very little )2. As the temperature increased in test tube
Place the mouthpiece in your mouth. Make sure your lips are closed tightly around it.
Step 4:Make sure the person holds the clothespin between their thumb and index finger and squeeze until the two ends meet.
5.) One at a time, place your test tubes in the water bath and heat the first test tube to 25 , the second to 50 , the third to 75, and the last to 100 degrees c. Remeber to stir with your stirring rod every so often.
- Hold the bob at a right angle from the clamp stand, and let it drop,
Since the early 1900’s, many different plastics have been developed, each having a special characteristic or advantage that makes it good for various purposes. Some plastics stood heat better, while some withstood shock better. Some could be spun into thread from making fabrics such as nylon. In 1938, Du Pont publicly announced the new synthetic fiber, nylon. The memo, that went out announcing nylon, defined “Nylon is the generic name for all materials defined scientifically as synthetic fiber-forming polymeric amides having a protein-like chemical structure; derivable from coal, air and water, or other substances and characterized by extreme toughness and strength and the peculiar ability to be formed into fibers and into various shapes such as bristles, sheets, etc” (138, 139).
Also, when we put the insulation cans in warn water the water heated up the can. And lastly, in the insulated can experiments, both cooling and heating, when the cans temperature was changed it in turn changed the air temperature
The Effect of Applying Weight to an Elastic Band and How it Affects the Length it Stretches To
Rubber is a valuable commodity in today's economy. A vast number of products are made from it, including washers, gloves, gaskets, tubing, waterproof clothing, toys, erasers, belts, elastics, bottle stoppers, and insulation for electrical wiring. The largest single use of rubber is in the manufacture of pneumatic tires which consumes 60% to 70% of the total world production each year. Demand for rubber has grown remarkably since the beginning of the industrial revolution.