Water is a unique solvent that allow organism to continue and advance. The substantial and chemical aspects of water provide a good medium for aquatic organisms. The bond that is set up between both water and aquatic organisms provide and transport nutrients to the living organism. Since water is transparent plants that live under water can still use the sunlight to perform photosynthesis. Water is also cohesive; water is made up of two hydrogen units and one oxygen unit. They are bonded covalently
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U.S. CHEMIC AL S AFETY AND H AZ ARD INVESTIG ATION BOARD INVESTIGATION REPORT LPG FIRE AT VALERO – MCKEE REFINERY (Four Injured, Total Refinery Evacuation, and Extended Shutdown) Photo: Associated Press VALERO ENERGY CORPORATION SUNRAY, TEXAS FEBRUARY 16, 2007 KEY ISSUES: • FREEZE PROTECTION OF DEAD-LEGS • EMERGENCY ISOLATION OF EQUIPMENT • FIREPROOFING OF SUPPORT STEEL • FIRE PROTECTION FOR HIGH PRESSURE LPG SERVICE • CHLORINE RELEASE REPORT NO. 2007-05-I-TX JULY 2008
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Study Guide:Quiz 1 Concentrate your studies in the following areas. Questions for Quiz 1 will come principally from this material. Lutgens and Tarbuck Textbook: Introduction * What is the definition of Earth Science? Is the name for all the sciences that collectively seek to understand Earth and its surrounding space. It includes geology oceanography, meterogology, and astronomy * What are the sub-disciplines of earth science (geology, meteorology, oceanography, and astronomy)? Know
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Pure chemical substances are classified as ionic, metallic, covalent molecular and covalent network. In this essay I will describe the nature of each bonding present in these different types of substances and use this to explain the physical properties they exhibit and their structures. Ionic compounds are compounds that are composed of positive and negative ions. An ionic compound is a chemical compound in which ions are held together in a lattice structure by ionic bonds. Usually, the positively
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Compounds; Diamond-Very Hard. Very high melting and boiling points. Cannot Conduct Electricity. Graphite-Soft. High Melting and Boiling Points. Conducts Electricity. Metallic Bonding: A ladus of ions in a sea of electrons. Properties of Metals: Conduct Electricity-Usually Dense-Malleable, ductile-High Melting and Boiling Points. Diatomic Molecules-These consist of two atoms the same, covalently bonded. CHEMICAL REACTIONS Mixture-2 or more elements not combined by a chemical reaction.
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involves a larger enthalpy change than does a chemical change. 2. True 3. False: The potential energy of the products is smaller than the potential energy of the reactants in an exothermic change. 4. True 5. False: An endothermic reaction absorbs heat from the surroundings. 6. True 7. True 8. False: Three-quarters of a radioisotope will have changed after two half-lives. 9. False: In an endothermic reaction, only the potential energy of the chemical system increases. 10. True 11. (b) 12.
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| flows easily particles can move past one another | flows easily particles can move/slide past one another | does not flow easily rigid - particles cannot move/slide past one another | ------------------------------------------------- Chemical or Physical? Physical changes do not cause a
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Atoms, Molecules and Ions. AN ATOM is the smallest particle of an element. They cannot be split into smaller particles in chemical reactions. Iron is made of iron atoms (Fe). Sulphur is made of sulphur atoms (S) A MOLECULE is a small group of atoms joined together. The atoms may be the same (e.g. O2) or different (e.g. H2O). The chemical formula shows the number and type of atoms present. Non-metal compounds are made of molecules: Carbon dioxide contains CO2 molecules Methane (natural gas)
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variety of functional groups may be attached. Hence the number of molecular structures which can be adopted by organic compounds is extremely large. Functional groups containing oxygen atoms, nitrogen atoms, and multiple bonds often determine the chemical and physical properties of carbon compounds. Therefore organic chemistry may be systematized by studying related groups of compounds such as alkanes, cycloalkanes, aromatic compounds, alkenes and alkynes, alcohols, ethers, aldehydes and
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in water and then filtrate B. Passing a magnet over the mixture C. Melting the mixture followed by filtration D. Heating the mixture 7. Which of the following substances has a giant ionic structure? A. Iodine B. Diamond C. Sodium chloride D. Graphite 8. Which of the following INCREASES from left to right in period 3 of the periodic table? A. The number of shells in the atom of the elements B. The electrical conductivity of the
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