an oxidation- reduction reaction. • To determine the concentration of an unknown sodium oxalate (Na2C2O4) solution by titrating it against standardized potassium permanganate solution (KMnO4). • To determine the percent by mass of Fe(II) in the form of ferrous ammonium sulfate Fe(NH4)2(SO4)2.6H2O in a mixture by redox titration. B. Theory: (electron transfer reactions) 2Mg (s) + O2 (g) 2MgO (s) 2Mg 2Mg2+ + 4e- O2 + 4e- 2O2- Oxidation half-reaction
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Benzoin Synthesis * When two benzaldehyde molecules condense in the presence of thiamine‚ it leads to the formation of a molecule of benzoin. The thiamine behaves as a coenzyme catalyst. This step of the reaction involves the addition of ethanol and sodium hydroxide into an aqueous solution of thiamine hydrochloride and creating a reaction with pure benzaldehyde. When you heat this mixture to a temperature of 60 degrees Celsius for about 90 minutes and then cool it in an ice bath‚ the benzoin crystallizes
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HKCEE Chemistry 2007 Paper 1 Section A 1. A is a compound formed from oxygen and magnesium‚ while B is a compound formed from oxygen and fluorine. a) Draw the electronic diagram of A‚ showing electrons in he outermost shells only. (1) b) Draw the electronic diagram of B‚ showing electrons in the outermost shells only. (1) c) Compare the melting points of A and B. Explains your answer. Melting point of A is higher than that of B. Ions of A are linked by strong ionic bonds /
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ELEMENTS .These are EIGHT groups numbered I to VII with the final group 0. *Each element in a group has the SAME NUMBER OF ELECTRONS IN ITS OUTER SHELL- for elements in Groups I to VII‚ this number is the same as the group number. *The COMMON OXIDATION STATE (NUMBER) of elements in the Groups I toe *Going DOWN a group‚ each element has ONE MORE ELECTRON SHELL than the previous element. *Elements in the same group have SIMILAR CHEMICAL PROPERTIES. *The METAL NATURE of elements INCREASES DOWN
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State the observable change in this test and explain your answer. (8 marks) 3 4 4. HKCEE 1998 Q5 Each of five unlabelled bottles contains one of the following chemicals: 2 M hydrochloric acid 2 M nitric acid 2 M sodium chloride solution 2 M sodium hydroxide solution distilled water Suggest how you would carry out tests to identify the
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Experiment 9. The action of saliva on starch Study the flow chart on p. 9.02 for a few minutes to gain an idea of the outline of the experiment. (a) Prepare a water bath by using a Bunsen burner to heat some water in a beaker on a tripod and gauze till it boils; then turn the flame down to keep the water just boiling. While waiting for the water to boil‚ carry on from (b). (b) Label eight test-tubes 1 - 8 and in tube 1 collect saliva as follows: (i) Thoroughly rinse the mouth with
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High Vol Petro Analysis Coal Analysis As Received Dry Basis % Moisture 7.52 xxxxxx % Ash 5.10 5.51 0.79 % Sul 0.86 %Volatile 37.35 34.54 Fixed Carbon 57.14 52.84 13‚522 BTU/lb 14‚622 MAF BTU 15‚475 FSI 7 Oxidation 96 ____________________________________________________________ ____________ CERTIFICATE OF ANALYSIS PETROGRAPHIC ANALYSIS Date sampled: 09-Mar 11 MACERAL COMPOSITION VOLUME% REACTIVES V-Types 7 8 9 10 7.3 36.4 20.5 2.0 66.2 0.0 3.4 VITRINITE EXINITE RESINITE Semifusinite
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SCH 4U1 FINAL EXAM REVIEW ATOMIC STRUCTURE AND MOLECULAR ARCHITECTURE 1. Describe the wave mechanical model of the atom. 2. Write the ground state electron configuration for Br. 3. Explain why the first ionization energy for Ne is significantly greater than Na. 4. Distinguish between ionization energy and electronegativity. 5. How does VSEPR Theory account for the fact that the bond angle in H2O is less than NH3? 6. Which of the following molecules are polar? Include diagrams
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Module 7 Exam Review ANSWER KEY 1. Define acid. (7.01) An acid is a substance that produces hydrogen ions‚ H+ or hydrodium ionsH3O+ in solution. 2. Compare the three theories of acids. (7.01) An Arrhenius acid is a substance the increases the concentration of hydrogen ion‚ H+ or hydronium ions H3O+when dissolved in water. You must have water. A BrØnsted-Lowry acid is any substance that donates a hydrogen ion‚ H+ to another substance. A Lewis acid is any substance that accepts a lone pair
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M10/4/CHEMI/HP2/ENG/TZ1/XX/M+ MARKSCHEME May 2010 CHEMISTRY Higher Level Paper 2 18 pages –2– M10/4/CHEMI/HP2/ENG/TZ1/XX/M+ This markscheme is confidential and for the exclusive use of examiners in this examination session. It is the property of the International Baccalaureate and must not be reproduced or distributed to any other person without the authorization of IB Cardiff. –5– Subject Details: M10/4/CHEMI/HP2/ENG/TZ1/XX/M+ Chemistry HL Paper 2 Markscheme
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