Patel Chem 101 10-13-09 Introduction The objective of this lab was to show how stoichiometry is applied to a specific chemical reaction. Stoichiometry is pretty much the math behind chemistry. Doing stoichiometry can calculate masses‚ moles‚ and percents with a chemical equation. The use of stoichiometry is how we were able to find the limiting reagent in this lab. A limiting reagent is the chemical that will be used up first. Many calculations had to be made throughout this lab. Some
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Object Length (cm) Length (mm) Length (M) CD 12cm 120mm .12M Key 5.3cm 53mm .053M Spoon 15.5cm 155mm .155M Fork 19.8cm 198mm .198M Water Temperature C° Temperature F° Temperature K Hot from tap 38 C° 100.4 F° 311K Boiling 93 C° 199.4 F° 366K Boiling 5 minutes 95 C° 203.0 F° 368K Cold from tap 15 C° 59 F° 288K Ice water 1 minute 8 C° 46.4 F° 281K Ice water 5 minutes 5 C° 41.0 F° 278K Object Estimated mass (g) Actual mass (g) Actual mass (Kg) Mechanical pencil 4g 5
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S.4Chemistry 2nd Term Project Be a Chemical Analyst-Analysis on ethnoic acid. Objective This experiment aims at determining the percentage by mass of ethanoic acid(CH3COOH) in a commercial vinegar using titration method. Chemical reaction involved: CH3COOH(aq) + NaOH(aq)→ NaCH3COO(aq) + H2O(l) Apparatus: An electronic balance‚ a 10.0cm3 pipette‚ a 25.0cm3 pipette‚ a pipette filler‚ a 250.0cm3 volumetric flask‚ a burette‚ stand and clamp‚ a conical flask‚ a white tile‚ 3 large beakers‚
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Investigating the Determining Characteristics of Cations and Anions Chem 111 Sec 560 Introduction: The purpose of this lab was to study the specific characteristics of cations and anions‚ and ultimately to be able to identify an unknown substance based on our studies and tests using the logic trees developed through the experiment. A logic tree is a graphical display of the findings from this lab which‚ through a series of yes/no questions‚ elimination tests
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Pre-Laboratory Assignment 1. What are the hazards associated with sodium hydroxide (NaOH) solution? Sodium hydroxide solutions‚ especially in high concentrations‚ are toxic and corrosive. 2. (a) What buret reading should you record when the liquid level is as shown in Figure 2? In Figure 2‚ the lower meniscus lies below the 3 mL line and 4 minor gradations that signify 0.1 values. Estimating the uncertain digit to be 0.04 mL‚ the reading we record for this particular buret is 3.44 mL.
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Gabriel Alizaidy Liquid Chromatography September 14‚ 2009 Objective: To separate the components of unsweetened‚ grape flavored Kool-Aid. Procedure: Using two syringes‚ inject different concentrations of alcohol to extract red and blue dyes‚ and artificial flavoring. Data: Conclusion: Different dyes are shown when separated by different concentrations of isopropyl alcohol. Discussion of Theory: Chromatography‚ resolution and selectivity played major roles in making the experiment work
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Synthesis Procedure 1 -1.0 Introduction A Cobalt-Amine-Halide compound is synthesized from cobalt (II) chloride hexahydrate. An orange-tinted solid is produced and is considered to be unknown since the specific ligand amounts are unknown. By determining the percent composition of various elements and compounds in the unknown‚ its true identity can be predicted. Chloride‚ ammonia‚ and cobalt are three examples of percent compositions determined to help narrow the selection of possible unknowns
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Purposes of Experiment: To synthesize a transition metal complex‚ potassium tris (oxalate)ferrate(III) trihydrate in a two step process‚ to learn new laboratory techniques such as decantation‚ recrystallization‚ gravity and suction filtration. Also the purpose of the experiment is to determine the actual‚ theoretical‚ and percent yields of product‚ and characterize the final compound by determining the number of waters of hydration by gravimetric analysis List of Observations: After adding
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CHEM 2204 Chromatography Lab by wyk.wong » Fri Jul 11‚ 2014 10:25 am Results and Calculations Rf values Rf=(Distance moved by the spot (cm))/(Distance moved by the solvent front (cm)) Toluene: Rf=2 cm/3.8 cm=0.53 (Fluorenone) Rf=1.1 cm/3.8 cm=0.29 (Fluorene) Hexane: Rf=1.8 cm/2.2 cm=0.82 (Fluorene) Rf=0 cm/2.2 cm=0 (Fluorene Table 1: Experimental IR peaks compared to literature IR peaks for fluorenone Functional group Experimental peak (cm-1) Literature peak (cm-1) C-H 3010.5 3013
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density increases‚ concentration does as well. The density of a substance is something that stays constant‚ for solutions of material the density is expected to increase in direct translation to the concentration increasing. The theory surrounding this lab was to see in practice how density could be determined with displacement and then to determine whether the density does in fact increase directly with the concentration. Summary of Key Data Figure 1: From Part 1 Mass of Brass 13.2200g Initial Volume
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