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Dietary minerals

lab5

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lab7

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89 68th and Zinc A key aspect of chemistry once a reaction is completed, is analysis. So far you have quantitatively analyzed your white colored compound from the reactant side based on your knowledge of how much iodine and zinc reacted. Now you will determine the amount of zinc from the product side. To do this you will perform a titration which is basically a reaction between a known quantified substance, Na2H2EDTA, and an unquantified substance in this case, the amount of zinc ion in your product, zinc iodide. Once you have mastered the technique of titration, you will be given an unknown zinc salt and asked to find out how much zinc ion is in this substance. By doing this activity you will see how one quantity can be logically deduced

lab3

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49 The Redox Arena Redox is a compressed way of writing reduction and oxidation. Reduction refers to an atom gaining electrons and oxidation involves an atom losing electrons. Together, this process is very telling, in that it points to a very important aspect of chemical change: the electrons. For a reaction to occur, new bonds must form between atoms. lt is the ability of electrons to be shared or transferred between atoms that cause new bonds to form. The electron, more so than the proton or neutron, is the active player in the arena of chemical change. 'u! pupr{ ol ^Jeuruns lo ^docolorld aIBU\l 'z pue I sued rol sernpecold ruEroElo ,(oll Jo ezuEluuns g lool peau lqel lsrll rno^ u! g-[ slool ,ura!^au ls!llcor.lc qe'I-ard v n n tr AJls!uaqc ouolsrauroc :sllPloo aqf

lab1

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15 Southside Seaweed Seaport Chemists are often depicted in movies or in books as eccentric and absent-minded p:ofessors. ln reality chemists are very in touch with the needs of society and are more practical tnan you nay think. Chemists often isolate substances found in nature or create new substances that benefil our heai:h. This activity is a case in point. You will be isolating an iodide salt that will be used to prepare a tinctlrre of lodine. Sold as an over-the-counter drug in your local pharmacy, iqQlne is used as an antiseptic on cL(s and scrapes of the skin. lodine has also been used to sanitize swimming pools and medical instruments pur,fy drinking water and is used in the treatment of goiter (swelling of the thyroid). I hope that this acti\.i}, r,rill convince many of

Bob Jones PPT Notes -- Chapter 8b

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Nomenclature What?s In a Name? Common names describe some aspect of the compound Examples: soda ash Epsom salts What?s In a Name? IUPAC system International Union of Pure & Applied Chemistry Common Name Chemical Name Formula Common Names of Some Industrial Chemicals oil of vitriol sulfuric acid H2SO4 caustic lime calcium hydroxide Ca(OH)2 lye sodium hydroxide NaOH Common Name Chemical Name Formula Common Names of Some Industrial Chemicals soda ash sodium carbonate Na2CO3 milk of magnesia magnesium hydroxide Mg(OH)2 IUPAC System Developed in the late 1800s Requires determining the type of compound before naming it Has a different set of naming rules for each type of compound Flow Chart Green: questions what type of bond Blue: gives naming information

Stoichiometry review questions

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A substance with the formula AB has the composition by mass of 30% A and 70% B. What is the composition by mass of the compound A2B? 70% A, 30% B 50% A, 50% B 46% A, 54% B 60% A, 40% B 65% A, 35% B A mass of 21.5 grams of calcium hydroxide reacts with an excess of phosphoric acid. What mass of calcium phosphate could be recovered from solution? 31.6 grams 94.7 grams 326 grams 284 grams 186 grams Given the equation 3A + 4B ? 2C + 3D, you react 5 moles of A with 7 moles of B. Which of the following statements is true? B has a greater molar mass than A A is the limiting reactant A has a greater molar mass than B
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