مدرستنا الثانوية اإلنجليزية‚الشارقة OUR OWN ENGLISH HIGH SCHOOL‚ SHARJAH A GEMS SCHOOL CHEMISTRY WORKSHEET TOPIC: METALS AND NON-METALS GRADE:8 Note: Revise the symbols and valency of metals and non-metals. Q1.What would you observe when you put a) Some zinc pieces into blue copper sulphate solution? b) Some copper pieces into green ferrous sulphate solution? c) An iron nail into blue copper sulphate solution? Q2.Complete and balance the following equations: a) Zn + O2 b) Pb + O2 c) Cu
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Compleximetric Determination of Water Hardness Caindec‚ Patricia Ysabel B. Water hardness is a measure of the amount of calcium and magnesium carbonate dissolved as Ca 2+ and Mg 2+ in water. There are no health hazards associated with water hardness‚ however‚ it causes scaling‚ as well as forming of soap suds. Compleximetric titration is one of the best ways of measuring total water hardness using a standard ethylenediaminetetraacetic acid (EDTA) solution. EDTA solution is used as it has the
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Heat of Neutralization Introduction: The purpose of this experiment was to measure‚ using a calorimeter‚ the energy changes accompanying neutralization reactions. In order to measure the amount of heat produced by a reaction‚ an instrument called a calorimeter was used. The calorimeter used in this experiment was somewhat rudimentary. It was constructed as shown in the following picture: After finding the heat capacity of the calorimeter‚ the student and partner neutralized two acids and
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An example of potential energy is A) a coiled spring. B) running water. C) tree branches blowing in the breeze. D) a moving elevator. E) electrical energy. Points Earned: 1.0/1.0 The correct answer is A. The definition of potential energy is an inactive type of energy that is stored for future use. All of these answers describe active energy‚ for example‚ running water is very active but can generate other types of energy. Which one of the following substances will float in gasoline
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ChemActivity 10: Exercises 1. Draw a complete mechanism including the intermediate and most likely product for the reaction of each alkene below with H-X. H + H Cl + Cl Cl + + Br H Br H I Br + H I H + I H 2. Draw a complete mechanism of each pair of reactant including any favorable rearrangements and all important resonance structures of all intermediates. Reactant Pair 1 Cl H Br 1 + Cl No shift stable benzylic carbocation H: shift H H Br
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Christina Hang Vanessa Hang Seng Xiong Period 5 December 14‚ 2012 Molecular Mass by Freezing Point Depression Objective: Determine the molecular mass of an unknown substance by finding the change in freezing point of a solvent when the unknown substance is dissolved in it. Qualitative Data: Trials BHT (g) Cetyl –Alcohol (g) Unknown substance (g) Melting Temperature 1 0.48 g 0 0 69.3 2 0.46 g 0.09 g 0 66.9 3 0.49 g 0 0.11 g 53.7 Analysis: 1.) Determine ___ for the solution of cetyl
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Zoo Virtual Field Trip Katherine A. Cottrell Liberty University EDUC 500 Zoo Virtual Field Trip In today’s technology age‚ virtual field trips can provide cognitive and affective gains similar to those of a real-life study trip. Field trips taken online can transport students to locations too far away to travel and are cost effective for the school district and parents as well. Teachers can guide and interact with all students in the class for the duration of the virtual field trip‚ which
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Fe(s) b. CaO(s) + CO2 (g) CaCO3 (s) 5. Calculate the H for the reaction: ClF + F2 ClF3 Given: 2ClF + O2 Cl2O + F2O H= 167.4 kJ 2ClF3 + 2 O2 Cl2O + 3F2O H= 341.4 kJ 2F2 + O2 2F2O H= -43.4 kJ Hess’s Law and Heat of Formation 1. Given: S(s) + 3/2 O2 (g) SO3 (g) H = -395.5 kJ 2SO2(g) + O2 (g) 2 SO3 (g) H = -198.2 kJ Find H for: S(s) + O2 (g) SO2(g) 2. Given: O2 (g) + H2 (g) 2OH(g) H= 77.9 kJ O2 (g) 2O(g) H
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When Milena was 8 months old. Q. How does your baby’s eating‚ sleeping and motor development compare to the typical developmental patterns? It’s recommended to give solid foods to an infant at 6 months of age‚ but in my child Milena’s case she only started to become interested in them at 8 months of age. Her pediatrician recommended that Milena should eat different types of foods that are taken from our family dinners. The Doctor also recommended to ground up our table food. After the physical
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NAME Dr. Harvey English 201 April 9‚ 2014 “Youthful Indiscretions: Should Colleges Protect Social Network Users from Themselves and Others?” As an attorney specializing in labor and employment and higher education law‚ Bostonian‚ Dana L. Fleming wrote an article entitled‚ “Youthful Indiscretions: Should Colleges Protect Social Network Users from Themselves and Others? The article was published in the Winter 2008 The New England Journal of Higher Education. In 2008‚ two social networking sites
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