Some physical properties: transparency‚ flexibility‚ elasticity‚ permeability‚ water resistant‚ electrical resistance‚ Specific Gravity‚ soft when hot. Some chemical properties: solubility‚ chemical resistance‚ thermal stability‚ reactivity with water‚ flammability‚ heat of combustion. Resin refers to the basic chemical composition of each type of plastic. Each resin has unique properties and is used (often mixed with additional chemicals and materials) in the manufacture of a variety of plastic
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ABS 757 physical and chemical characters Matter states: white colloid Shape: granular Smell: no Flash point: 404°C Natural temperature: 466°C explosion limits: 45g/㎡ Minimum fire energy: 3.6MJ Specific gravity: 1.03-1.10 ABS 757 material characters properties Test method Test condition ABS 757 Tensile strength ASTM D638 1/8”‚ 6mm/min 480(6800) Tensile elongation ASTM D638 1/8”‚ 6mm/min 20 Flexural modulus ASTM D790 1/4”‚ 2.8mm/min 820(11660) Flexural modulus ASTM D256 1/4”‚ 2.8mm/min
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What is Forensic Science? The word forensic comes from the Latin word forensis: public; to the forum or public discussion; argumentative‚ rhetorical‚ belonging to debate or discussion. From there it is a small step to the modern definition of forensic as belonging to‚ used in or suitable to courts of judicature‚ or to public discussion or debate. Forensic science is science used in public‚ in a court‚ or in the justice system. Any science used for the purposes of the law is a forensic science. What
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January 18th‚ 2011 Why Forensic Science? “What do you want to do after high school?” this seems like a simple question but I can’t tell you how many of my friends couldn’t come up with an answer. I graduated from high school this past June‚ and I was asked that same question at least a hundred times. My answer was the same every time “I want to be a forensic scientist”. I received a lot of different responses‚ but the one that was the most common was; “Why forensic science?” I was tired of answering
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Lab 15: Chemical and Physical Properties Introduction Pre-lab Questions 1. Determine if the following scenarios represent a chemical or physical property. a. Dry ice (CO2) sublimes (changes from a solid to gas) at -78 ⁰C at standard atmospheric pressure. Physical b. Iron metal rusts in moist conditions. Chemical c. Hydrogen peroxide decomposes in the presences of light or heat. Chemical d. Silver metal does not react with hydrochloric acid (HCl). Chemical e. Copper is a
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Title: Physical and Chemical Properties Purpose: To investigate the physical and chemical properties of pure substances as distinguishing characteristics. Procedure: 1. Set up a well plate with 24 pieces and fill two with either Dilute HCl or Dilute NaOH. 2. Set up four test tubes with any single substance in each one. 3. Observe and record original color and odor of substance. 4. Light flame with matches. -Hold test tube with substance in it over flame with clamps -Observe and record
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you observer any chemical changes in this experiment? Yes. CuCo2 turned green when I applied heat to it. B. What evidence did you use to decide that something was a chemical change? I viewed my other test tubes to see if it there was a chemical change in those. C. Give at least two examples of chemical changes you observed. Zn and MgO when I Diluted HCL D. Classify the following properties of sodium metal as physical or chemical: • Silver metallic color: Physical • Turns gray in
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9/23/2014 Experiment # 3 Purpose: the purpose of this experiment was to explore the distinctions between physical and chemical properties and between physical and chemical changes. Lab questions: 1. Based on my observation CaCl2 is soluble in water. 2. When 15% of HCl was added to CaCl2 as the teacher was performing the experiment I observed and realized some changes took place physically. It was physical change because the color was clear. 3. By adding 15% of HCl of CaCo3 ‚ made it change chemically
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Element: Simplest form of matter to have unique chemical properties. Atom: The smallest particles with unique chemical identities. Nucleus: Center of an atom (composed of protons and neutrons). Proton: Have a single positive charge (+1). Neutron: Have no charge. Electron: Tiny particles with a single negative charge and very low mass (-1)/determines chemical bonding properties of an atom. Atomic Number: Number of protons in the nucleus. Atomic Mass: Approximate number of protons and neutrons
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Review Questions 1. What are the four types of evidence in a criminal investigation? The four types of evidence is physical evidence‚ documentary evidence‚ demonstrative evidence and testimony. 2. What are individual characteristics? Give an example of an individual characteristic? Individual characteristics are properties associated with a common source to a high degree of certainty. An example of individual characteristics that forensic scientists may look for are the ridge characteristics of
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