editable file which can be sent to an instructor. Observations Questions A. Write net ionic equations for all reactions that produce a precipitate. Ag+(aq.) + Cl-(aq.) ---- AgCl (s) 2 Ag+(aq.)+ 2OH- --- Ag2O (s) + H2O(l) 2 Ag+(aq.)+2NH3+ H2O(l) --- Ag2O (s)+ 2NH4+ (aq.) Pb2+(aq.)+2Cl- (aq.) ---- PbCl2(s) Pb2+(aq.)+2OH-(aq.) ----Pb(OH)2 (s) Pb2+(aq
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Acidity’s effects on Fruit Browning Aim: To test whether the acidity of the surface area of an apple has an effect on the rate of enzymatic browning over 70 minutes. Hypothesis: the more acidic the surface area the longer it takes for the fruit to oxidise. Variables: Independent: acidity of surface area of the apple Dependent: the progression of melanin (brown pigment) after 70 minutes Controlled/fixed: time of day‚ knife used to cut fruit‚ portion of fruit‚ environment
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Illustrating the Oxidation States of Mn & V © KCl http://hk.geocities.com/fatherofchemistry Procedure © KCl http://hk.geocities.com/fatherofchemistry Discussion Part A: Making Mn(VI) from Mn(VII) and Mn(IV) 1.> Explain why only one of the three mixtures reacted to give green Mn(VI). [ANS] By Le Chatelier’s Principle‚ only the alkaline medium will shift the equilibrium to right and yield green MnO42-. 2.> What happened when acid was added
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Bleach Oxidation of 9-Hydroxyfluorene The purpose of this experiment was to oxidize an alcohol (9-hydroxyfluorene) to a ketone (9-fluorenone) using aqueous sodium hypochlorite (bleach) as the oxidizing agent‚ while introducing techniques used in microscale experiments. Reaction: Results 1. Recrystallized Product Yield Product yield = (actual yield/theoretical yield) x 100% 3mL 9-hydroxyfluorene x (1mL/1000mL) x (0.09 mol/L) = 2.7 x 10-4 moles 0.05g 9-fluorenone / (180.20g/mol) = 2.77 x 10-4
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Observations of Chemical Changes Purpose/Hypothesis: To observe how acids react with bases and examine reactions of common household cleaners and the macroscopic changes these chemicals undergo. I expect for each solution to react differently when mixed with acids and bases. Procedure: I have a well-plate-96‚ a piece of white and black paper‚ and the chemicals from the Observation of Chemical Changes Experiment Bag. I used a different well for each combination of solutions. I placed two
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Section: Bio 202 labpaq rep 01 LAB REPORT: ENDOCRINE SYSTEM You must get all parts of the question correct to get credit for the question Step 1 (Can be observed on the following slides‚ either from your lab kit or from the Labpaq web site (http://www.labpaq.com/ex-1-endocrine-system)). List the following: · Location in the body of the following structures · Slide #/location observed · One hormone secreted by each Please pay special attention to properties like shapes‚ sizes
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Case 13 Reducing Fertility in Bangladesh Geographic area: Bangladesh Health condition: in the mid-970s‚ a Bangladeshi woman had more than six children on average. in combination with poor nutrition and lack of access to quality health services‚ this high fertility rate jeopardized the health of both the woman and her children. Beyond the health impact‚ high fertility and rapid population growth represented a major constraint to the country’s economic development and social progress. Global importance
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uncertainty reduction theory from its origin to date. Ever since uncertainty reduction theory was first created‚ many researchers have examined it by comparing it with other theories. Uncertainty reduction theory had been tested across different cultures in order to confirm its generalizability. It had also been applied to real life situations to examine how individuals interact in their initial encounters with strangers. In addition‚ researchers suggested testing uncertainty reduction theory beyond
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By Vivian Cheng Health: Period 4 Mrs. Darpino December 2011 By Vivian Cheng Health: Period 4 Mrs. Darpino December 2011 Harm Reduction Theory Harm Reduction Theory Vivian Cheng Health Period 4 December‚ 2011 “Harm Reduction Theory” The war against drugs is an unwinnable war. Today‚ this seems to be a growing argument in the modern world. In a study performed in 2009‚ it was found that approximately 8.7% of Americans‚ twelve years
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REDUCTION GEARBOX DESIGN PROJECT DESCRIPTION You are the designer and you have been asked to design a speed reducer that will take power from the shaft of an electric motor rotating at 1500 rpm and deliver it to a machine that is to operate at approximately 750 rpm. Assume that you have decided to use spur gears to transmit the power and you are proposing to use a single-reduction speed reducer. The power to be transmitted by the shaft is 20 KW and the input shaft is coupled to
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