Name__________________________ Chemistry 190: Organic Chemistry EXAM 3 Thursday April 21‚ 2011 1. (12) ______ 2. (14) ______ 3. (20) ______ 4. (12) ______ 5. (54) ______ 6. (16) ______ 7. (12) ______ 8. (10) ______ Total (150) ______ The exam consists of twelve numbered pages and an unnumbered cover sheet. Make certain that you have a complete exam. You will have two hours to work on the exam. No books or notes are allowed; however‚ you may use a molecular model set and a calculator
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1) Demonstrate understanding of the terms atom and molecule. Atom= Smallest Unit of Matter Molecule= 2 or more atoms chemically bonded. 2) Describe paper chromatography. 3) Interpret simple chromatograms. A method used to separate a Solution‚ using a Paper and a beaker of water. The Substances in the Paper go up depending on their Mass. We can say that a Solution has the same substance as another solution because they form a line of the same height. 4) Describe methods of separation
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Chemistry Exam 2 Notes/Outline Exam Chapters and Topics: 13.1-13.2 Reaction Rates 13.3-13.4 Integrated Rate Law 13.4-13.6 Effect of Temperature‚ Catalysts‚ Reaction Mechanisms II 21.1-21.2 Radioactive Particles‚ Rates of Decay 14.1-14.2 Introduction to Equilibrium‚ Reaction Quotient 14.3 LeChatelier’s Principle 14.4-14.5 Equilibrium Calculations Chapter 13 I. Reaction Rates Chemical Kinetics: The study of the rates of chemical reactions These reactions occurs when a reactant species
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something + 2Fe+2 Equation 2: 8H+ + 5Fe+2 + MnO4- --> 5Fe+3 + Mn+2 + 4H2O Equation 3: 6H+ + 2MnO4- + 5H2C2O4 --> 2Mn+2 + 10CO2 + 8H2O Conclusion: Therefore the concluded reaction would be: NH3OH+ + 2Fe+3 --> N2O + 2Fe+2 This was obtained by using stoichiometry half reactions the product of that reaction was determined to be N2O. Some systematic errors could be if the wrong molarity was determined for the permanganate because then that would though off the calculations for the Fe+2 and the rest of the
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Chemical Lab Report INVESTIGATING THE FACTOR AFFECTING THE VOLTAGE OF VOLTAIC CELL Name: Lim Seong Hseng Date: 20th March 2013 IA CRITERIA ASSESSED: D Declaration: I declare that this report I have submitted is my own original work and I have acknowledged the use of words or ideas of another person. Signature:……………… Marks:………………. Introduction Aim: To investigate the factor affecting voltage of voltaic cell. Research Question: How does coupling of different metals from the electroactivity
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DIRECTIONS 1. USING GRAPH PAPER construct the following graphs BY HAND. Make sure to label the axes (include units) and give each graph a title. Make sure to use an appropriate scale. 2. Answer the questions. 3. USING LOGGER PRO construct the same graphs. Compare your results. 1. Several samples of pure tin were weighed and placed in a graduated cylinder filled with water to measure their volume by water displacement. Show the relationship between the mass and volume of the samples
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FORM 4G ELECTROLYSIS WORKSHEET TERM 3 2010-2011 1.Figure 1 below is a diagram of the apparatus used in the electrolysis of fused sodium bromide. Figure 1 a)Write the formulae for the ions present in the fused sodium bromide. b)Write an ionic equation to represent the reaction taking place at the positive and negative electrodes. c)When the heat source was removed‚ the crucible cooled and the lamp went out. Explain why the lamp went out when the crucible cooled. d)At the end of the experiment
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Chem Final Exam Combination Combination reactions‚ also known as synthesis reactions‚ involve the combination of two or more substances into a single new substance: A + B ---> AB Many metal oxides‚ for example‚ absorb carbon dioxide (CO2) from the air to form carbonates: CaO(s) + CO2(g) ---> CaCO3(s) Decomposition Decomposition reactions represent the reverse of the combination process in that one substance breaks down into two or more substances: AB ---> A + B Water‚ or H2O‚ for example
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ZnCI2 .4531g of ZnCl2 x 1 moles ZnCI2/m. moles ZnCI2 x 1molZn/1 mol of ZnCI2 x 65.39 of Zn/1 mol Zn = .2174g Zn Materials needed: Scale Burette Beaker Spatula Erlenmeyer flask Prenolpthen (color indicator) ZnCL2 NaOH Tube Vacuum Paper filters Rubber base Questions: 1. What is the weight of a post 1982 penny? 2.5 grams 2. What is the percent copper and zinc in a post 1982 penny? 97.5% of zinc and 2.5% of copper 3. How many grams of copper and zinc are in a post
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A colorless liquid. Insoluble in water. Corrosive to metals and tissue. Non-combustible‚ substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood‚ paper‚ oil‚ clothing‚ etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Sodium carbonate Odorless white crystalline powder or lumps. Slightly alkaline (bitter) taste. pH (of freshly prepared 0.1 molar aqueous
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