Objectives The main objective of this experiment is to differentiate between a physical change and a chemical change. A physical change includes a change in the material without affecting its composition‚ such as the physical state change. However‚ a chemical change includes the change in the composition of the substance. The change in color‚ formation of a gas or a solid product‚ and the production of energy are the evidences of a chemical reaction‚ thus‚ of a chemical change. Materials
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Paragraph 1 In this paragraph‚ the structural and chemistry differences between quartz‚ α-FePO4 and β-FePO4 will be discussed. Quartz do have some similarities with the other 2 components. The structure of quartz‚ similarly depends on the temperature of the environment. Quartz can exist as an alpha or beta form. This is one similarity between the 3. The difference between α-FePO4 and β-FePO4‚ is that α-FePO4 is the most common form of existence for FePO4 and is structurally similar to the alpha
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Paragraph 1 - Compare and contrast the crystal structures and crystal chemistry of quartz‚ α-FePO4 and β-FePO4. Both α-FePO4 (space group: P3121) and α-quartz (space group: P3121 and P3221) belong to the trigonal crystal system‚ while β- FePO4 (space group: P6422) and β-quartz (space group: P6222 and P6422) belong to the hexagonal crystal system. At relatively low temperature‚ FePO4 is tetrahedral in structure. This is similar to the tetrahedral structure of quartz. As temperature increases‚ the
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1. The following are essential requisites of a negotiable promissory note except a. must be written and signed by the drawer b. must contain an unconditional promise to pay a sum certain in money c. must be payable upon fixed determinable future time. d. must be payable to order or bearer 2. Which of the following is not an essential element of a bill of exchange? a. must be written and signed by the drawee b. must contain an unconditional promise to pay a sum certain in money c. must
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Why Were Cornell Notes Invented? The Cornell note taking system‚ developed by former Cornell University professor Walter Pauk in 1949‚ features three areas. It features a three-part system used for condensing and organizing notes‚ whether in the classroom or out in the field. One area is for note taking‚ the second is for review notes‚ and the last one is for summarizing. Cornell notes was invented to benefit students in the classroom and help them formulate a way in which they can understand
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Animal testing is wrong and it is cruelty to animals. Each year about five million dogs‚ cats‚ rabbits‚ rats‚ monkeys‚ and other animals die in lethal dose tests performed in many states around the United States. During a lethal dose test‚ the experimental substance is forced into the animals throats‚ or is pumped into their stomaches by a tube sometimes causing death by stomach rupture or from the sheer bulk of a chemical dosage. Substances are mixed in lab chows‚ injected under the skin‚ into a
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ENZYMES IN ORGANIC CHEMISTRY Why enzymes in organic synthesis? | Alternative to chemical methods: * High region- and stereoselectivity * Milder reaction conditions * Environmentally more friendly | Which enzyme(s)? | OxidoreductasesHydrolasesLyasesIsomerases | Which reaction system? | AqueousAqueous and water-miscible organic solventAqueous and water-immiscible organic solventPure organic solventOther solvents (supercritical fluids‚ ionic liquids) | Which ‘chemistry’ | (dynamic) kinetic
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Complete Solutions Manual GENERAL CHEMISTRY NINTH EDITION Ebbing/Gammon David Bookin Mt. San Jacinto College Darrell D. Ebbing Wayne State University‚ Emeritus Steven D. Gammon Western Washington University HOUGHTON MIFFLIN COMPANY BOSTON NEW YORK Vice President and Executive Publisher: George Hoffman Vice President and Publisher: Charles Hartford Senior Marketing Manager: Laura McGinn Development Editor: Kate Heinle Assistant Editor: Amy Galvin Editorial Assistant: Chip
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Development of the periodic table ➢ The elements in the periodic table have been arranged in the order of the number of protons (a.k.a. atomic number) The next significant stage in the development of the periodic table was discovered by came from John Newlands. He arranged the known elements in order of their atomic masses. He introduced the ‘law of octaves’ which meant that every eighth element had similar properties. As it didn’t work for all the known elements it was therefore dismissed
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Amanda Bynes 2.1 assessment p.5 pg. 38 October 1st 1a. Describe the structure of an atom -Proton‚ neutron‚ electron 1b. An atom of calcium contains 20 protons. How many electrons does it have? -20 2b. Compare the structure of carbon-12 and carbon-13 -Carbon-12 has 6 protons‚ 6 electrons and 6 neutrons. Carbon-14 has 6 protons‚ 6 electrons and 8 neutrons. 4a. What are two types of bonds that hold the atoms within a compound together?
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