identity of the unknown sample are listed in Table 1. Density (g/cm3) Molecular Weight (g/mol) Melting Point (ºC) Polypropylene 0.905 42.08 170 Polyethylene 0.92 28.05 130-145 Polycarbonate 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)
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To calibrate a 100 mL volumetric flask To calibrate a 50 mL measuring cylinder INTRODUCTION The purpose of this experiment is to study the relationship of several types of volumetric glassware and the accuracy of measuring the volumes of liquids very precisely in quantitative laboratory work. The accuracy of the measurement the volumes is the degree of closeness of measurements of a quantity’s actual volumes while the precision of the volumes is the degree to which repeated measurements under
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Rongrong Office: N1.2-B2-32 Office: N1.2-B1-08 Phone: 6316 8830 Phone: 6514 1055 Email: wmlau@ntu.edu.sg Email: rrjiang@ntu.edu.sg Course Outline • Particulate Technology – Particle size analysis – Packed bed – Gas-solid fluidized bed – Gas-liquid-solid fluidized bed • Filtration • Crystallization • Drying Covered by Prof. Jiang Rongrong Grading • Continuous Assessment – 30% Quizzes • Exam – 70% Final Exam Text Particulate Technology • Liang-Shih Fan and Chao Zhu‚ Principles
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Senior Science Half-Yearly Revision 1. Surface tension - A property of the surface of a liquid. It is what causes the surface portion of liquid to be attracted to another surface‚ such as that of another portion of liquid. Surface tension is caused by cohesion (the attraction of molecules to like molecules). Since the molecules on the surface of the liquid are not surrounded by like molecules on all sides‚ they are more attracted to their neighbours on the surface. Mercury has a high surface
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Measurement and Density Your Name: ____________________________________________________________ __ Purpose of this Lab What is the goal of this lab? What question are you trying to answer‚ or what problem are you trying to explain? Hypothesis After reading the lab instructions - but before starting the lab - record your best “educated guess” about each experiment: Experiment 1: Which method of finding the density give you the least percent error and why? Experiment 2: After completing the
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Fundamental of Engineering Calculation 1. Determine the following unit conversions to SI units: a. Density value of 60 lbft3 to kgm3‚ Ans: 961.1 kg/m3 b. Energy value of 1.7 ×103Btu to kJ‚ Ans: 1.8 x 103 kJ c. Enthalpy value of 2475 BtulbtokJkg‚ Ans: 5756 kJ/kg d. Pressure value of 14.69 psig to kPa‚ Ans: 201.88 kPa e. Viscosity value of 20 cp to Pa∙s‚ Ans: 2 x 10-2 Pa∙s Table of Conversion Factor 1 lb | 0.454 kg |
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bottle‚ put 3-4 cups of cold water into the bottle‚ then add the vegetable oil till its nearly full up to the top‚ then add 10-15 drops of food colouring‚ after that add 1 or 2 alka-seltzer tablets and watch the effect happen. Finding out about the density of water and oil. | Learning Outcomes for the Children from the National Curriculum; | During Key Stage 2 pupils learn about a wider range of living things‚ materials and phenomena. They begin to make links between ideas and to explain
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| M.P.℃ | B.P.℃ | Density g/cm3 | D-glucose | 180.16 | 146 | - | 1.54 | ZnCl2 | 136.315 | 292 | 756 | 2.907 | Acetic anhydride | 102.9 | -73.1 | 139.8 | 1.082 | Methanol | 32.04 | -98~-97 | 64.7 | 0.7918 | α-D- glucopyranose | 390.34 | 109-112 | 452 | 1.3 | 3. Phenomena and data The reaction in pear shape flask is not vigorously because the amount reflexed solution can even not bring the raw material attached on condenser back to flask. The color of the liquid in reactor is brown
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examine 2 different types of liquid body armour. Liquid body armour is protective clothing with liquid chemicals designed to strengthen it to absorb and/or deflect slashing‚ stabbing and penetrating attacks by weapons. The poster will discuss two different liquid used to strengthen kevlar (modern armour material). The first is a colloid of silicon dioxide particles suspended in polyethylene oxide. this liquid is a Shear thickening fluid which hardens on impact. the second liquid used is a magnetorheological
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Ralph - One of the main characters in the novel. He has many characteristics such as being very athletic‚ charismatic‚ leading‚ and a smart protagonist of the group of kids. Ralph was elected the leader of the boys at the beginning of the book. While most of the other boys are mainly concerned with having fun and not doing any work‚ Ralph focuses on building huts and thinking of ways to increase their chances of being rescued. Ralph’s influence over the other boys is safe at the beginning of the
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