CHAPTER 5: PERIODIC TABLE Development of the Periodic Table • i) Substance exist: naturally in elemental form Example: Gold‚ Uranium as unstable compound Example: Radioactive compounds as stable compound (majority) How to know whether a substance is a compound OR an element? ii) iii) • • • Grouping system: 1800: 31 elements identified 1865: 63 elements identified Audi Majdan – DMC 101 – KLIUC 1 • Dmitri Mendeleev: i) ii) iii) iv) Develop a system to group
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Topic 1.2 AMOUNT OF SUBSTANCE The mole Reacting masses and atom economy Solutions and titrations The ideal gas equation Empirical and molecular formulae Ionic equations Mill Hill County High School THE MOLE Since atoms are so small‚ any sensible laboratory quantity of substance must contain a huge number of atoms: 1 litre of water contains 3.3 x 1025 molecules. 1 gram of magnesium contains 2.5 x 1022 atoms. 100 cm3 of oxygen contains 2.5 x
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Sensation and Perception Chapter 15 - Taste Taste Versus Flavour Retronasal Olfaction • The sensation of an odour that is perceived when chewing and swallowing forces an odourant in the mouth‚ up behind the palate into the nose. • Such odour sensations are perceived as originating from the mouth‚ even though the actual contact of odourant and receptor occurs at the olfactory epithelium Flavour • The combination of true taste (sweet‚ salty‚ sour‚ bitter) and retronasal olfaction Taste
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synthesis coordination compound. Coordination compounds are formed when a neutral metal atom: Fe acting as a Lewis acid‚ reacts with some neutral molecules‚ acting as Lewis bases; or when a metallic cation‚ acting as a Lewis acid‚ reacts with any of a variety of organic or inorganic molecules‚ cations‚ or anions‚ acting as Lewis bases. These Lewis bases: C2O4 and H2O are called ligands. (Lewis acids are electron pair acceptors and Lewis bases are electron pair donors. Ferrous ammonium solution is added
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experiment‚ the high charge density‚ positive charge and their vacant bonding orbitals leads to tendency to attract lone pair electron by filling up their vacant orbitals. Metal acetylacetonates‚ formed by a metal and multiple acetylacetonate anions‚ are prime examples of coordination complexes. In this experiment‚ the metal use is copper (II) ion which is crystal blue in colour when it is copper(II)nitrate. All metal ions in solution can react well with water. The water molecules can also be
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formed? (compound). What represents a compound? (chemical formula). How do we write the formulas of compounds? PROCEDURE: 1. Let the students define the following terms: compound‚ metal‚ non-metals‚ ionic compound‚ covalent compound‚ ion‚ cation‚ anion‚ polyatomic ion‚ oxidation no. ‚ chemical formula‚ binary compounds‚ ternary compounds. 2. Ask the importance of giving chemical formulas to compounds. 3. Classify compounds as ionic or covalent. If ionic‚ identify whether binary or ternary
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The Essence of Chemistry & Significant Contributors to scientific development | 1 HONORS CHEMISTRY Introduction to Chemistry Notes Make sure you can understand these basic questions and concepts so that you can build on the basics to understand the complex material These are just the basics of what is covered in class lectures. This should not be the only resources you use to study. Who developed the concept of atoms? What are atoms? What is the Law of conservation of mass? What is the law of definite
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Clinical Chemistry When people consider their careers in the health care field‚ most of them would think about being a physician‚ a nurse or a surgeon. Individuals with interest in the health care field are not aware of clinical laboratory science. I am one of those individuals who don’t know much about clinical laboratory science before. After taking the class “Introduction to Clinical Laboratory Science”‚ I start to realize that clinical laboratory scientists are just like other health care members
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Oxygen Requirements of Bacteria BACKGROUND The GasPak system is useful for culturing anaerobic bacteria on standard microbiological media because the GasPak generates carbon dioxide and hydrogen. The hydrogen will combine with oxygen present in an anaerobic jar to produce water. This system can reproducibly attain oxygen levels in the parts per million range if used correctly. This is the best method for determining the oxygen requirements of unknown organisms. A candle jar is useful
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to learn how to calculate the percent of water (by mass) in barium chloride and an unknown hydrate salt‚ as well as properly calculating the water of crystallization for the unknown hydrate salt. A hydrate salt is composed of anions (-) and cations (+) surrounded by a fixed number of water molecules‚ called water of crystallization. The hydrate decomposes upon heating and produces an anhydrous salt. After finding the formula mass of the hydrate by adding the amu ‚ we can calculate
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