1.2 158 310 Polystyrene 1.05 104 240 Polyvinyl chloride 1.4 62.5 160-172 Table 1 Properties for five known polymers (Callister 737-775) The melting temperature of a polymer is the point at which it transforms from the solid form to a viscous liquid in which there is little molecular order (Callister 500). This temperature depends on the stiffness of the molecular chain‚ molecular weight‚ and the degree or branching (Callister‚ 502). Chain stiffness is controlled by the ease of rotation about
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box. 3. Attach the stopcock to the tip of the titrator by placing the larger‚ clear‚ plastic end of the stopcock into the tip of the titrator and then twisting the stopcock into place. The stopcock should fit tightly into the titrator‚ so that the liquid will not leak. 4. Stack the textbooks on top of one another or stack two textbooks on top of the LabPaq box. 5. Clamp the test tube holder around the middle of the titrator and slide the long end under the top two books in the stack. Place a sheet
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Abstract-Timur Solid phase extraction is a sample preparation technique that overperform liquid /liquid extraction in its efficiency‚ labor intensity and waste disposal. The purpose of this lab is to learn how SPE can be used to identify trace amounts of Vanillin. Stock solution of vanillin in water with concentration of 50 ppm was prepared. Four solutions with concentration of 5 ppm‚ 1 ppm‚ 0.5 ppm and 0.1 ppm were made from stock solution. UV-Vis spectra of standard solution was recorded at 229
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Discussion The mucilage glue would work well with paper because the paper would soak up the glue and the wood would have to have a lot of glue and time. The glue stick isn’t that wet so it wouldn’t be soaked up by the wood. The white glue is a liquid so it’s sticky but takes time to dry. VII. Conclusion I was right when I said that mucilage glue is good on paper. I was right also when I said that‚ a glue stick is pretty good on paper. I said that the white glue just needed time to dry‚ so
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"Diffusion - How atoms move through solids" Diffusion means mass transport by atomic motion. The mechanisms of Gases & Liquids is known as random (Brownian) motion and for solids is known vacancy diffusion or interstitial diffusion. Simply we can define diffusion as‚ the movement of particles in a solid from an area of high concentration to an area of low concentration‚ resulting in the uniform distribution of the substance. (Diffusion chapter 5‚ 2008‚ p.1) Ronald D. Kriz(1999) suggests that
Free Diffusion Molecular diffusion Atom
Effects of Hydration on the Human Body Rebecca St. Clair SCI/241 January 9‚ 2011 Ms. Katherine Jones‚ Ph D Water is an essential nutrient that provides health maintenance by regulating body temperature‚ providing lubrication and shock absorption‚ and is essential to maintain proper physiologic functioning. Over half of the human body weight is comprised of water. Water helps to regulate many human body functions such as: body temperature‚ and the amount of water lost through kidney functions
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on the penny was impressive. Hypothesis: The detergent will thicken the water making a tighter surface tension. Prediction: If soap increased the surface tension‚ then expansion will happen. Materials: (1) Pipette (2) Water (3) Penny (4) Liquid Soap Method: Retrieve materials‚ and set two pennies onto the table. Using the pipette drop as many drops as you can onto the penny until it spill over. Record the amount into your data‚ and repeat four times. Once completed‚ average the trials
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self-conscience. You can also damaging the person’s window or paint by making small scratches on the surface because as your finger collects dirt it turns into sand paper. When working on cars it important to put fender cover to avoid scratching or spilling liquids such as brake fluid that can “eat” away at the paint. Resulting in costly repairs. Furthermore‚ when we are coming up from under the car or working around body panels it’s important to make sure we don’t leave behind finger marks or drops of oil.
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Cheyenne Kenny September 29‚ 2014. Biology Properties Of Water Adhesion How does temperature change affect surface tension? As the temperature of a liquid increases‚ its surface tension decreases. When water heats up‚ the movement of its molecules disrupts the imbalanced forces on the surface of the water and weakens its sheet-like barrier of tightly bound molecules‚ thereby lowering the surface tension. This is why hot water is more effective when cleaning; its low surface
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filtration) Organic layer Unknown (By Evaporation) Procedure and Observation: 0.30093 g of panacetin was weighed and mixed well with 50 ml of dichloromethane. After stirring the solution thoroughly‚ some solid is formed (solid sucrose) and liquid. With using a preweighed filter paper to filter the mixture‚ and after the sucrose had dried‚ it was weighed out to 0.7756g. For the aqueous layer‚ adding 10ml of 6M HCl(pH 2) and filtered using vacuum filtration and after cooled in the ice bath.
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