White precipitate shows the presence of chloride (Cl-). Chloride anion equation: HCl(aq) + AgNO3 (aq) → HNO3 (aq) + AgCl(s). The nitrate anion test involves cooling a mixture containing 1 mL of test solution and 3mL 18M H2SO4. 2mL is poured down the inner test tube side and the presence of a brown ring shows nitrate (NO3-) to be present. The carbonate anion test mixes 1 mL of test solution and drops of 6M HCl.
| Observations of Chemicals | Zinc Sulfate | Powder of a white solid | Barium Iodide | Powder of a white solid. | Deionized water | Liquid, transparent. | Trial # | BaI2 | ZnSO4 | Theoretical Yield of ZnI2 | Actual Yield | Percent Yield | 1 | .67g | .45g | .499820g | .52g | 104% | 2 | .67g | .45g | .499820g | .52g | 104% | 3 | .66g | .46g | .493117g | .48g | 97% | Calculations for Cost | Double Replacement | Synthesis | 0.48 grams of Zinc Sulfate - $0.02 | 1.00 gram Granular Zinc - $62.50 | 0.67grams of Barium Iodine Dihydrate - $0.886 | 2.00 gram Iodine - ($74.90 × 2) - $149.80 | 0.52 grams of Zinc Iodide - $0.906 | 1.00 gram zinc - $0.212 | 1000 grams of Zinc Iodide = $1,923.00 | 1000 grams of Zinc Ioidide = $212.30 | Focus Question Should chemists prepare Zinc Iodide, from its Elements or from a Double Replacement Reaction between Barium Iodide and Zinc Sulfate?
Fash was a very interesting book that catalogued the history of the Maya from the Preclassic Period (2000 B.C.E to 250 AD) to the Postclassic Period (900 AD- 1200 AD) including the collapse of the Classic Period centers in the southern lowlands, to the arrival of the Spanish conquistadores in 1519 AD. The first section of the book talks about Copan as being the classic Maya center describing Copan as “the Athens of the New World” and also explains the importance of archeological studies at the site. Copan has more hieroglyphic inscriptions and other sculpted monuments than any other Maya ruin, or any other site in the New World. The principal group of ruins, or site core, consists of a series of large buildings constructed around open courtyards which frequently contained stelae and alters. The principal groups contained two basic parts; the north included many low-lying plazas and to the south, the upraised courtyards and constituent structures were built upon the Acropolis .
Results APPEARANCES OF MATERIALS USED Substance Physical Appearance Zinc Carbonate White; powderish Calcium Hydroxide White; powderish; like zinc carbonate 3 M HCL Clear liquid, resembles water 20 mesh granular zinc Grey, metallic, shiny 3% hydrogen peroxide Clear liquid; resembles water Manganese dioxide Very dark grey, black and powdery Copper sulfate Blue, crystalline in structure. Sky blue Zinc iodide Very dark purple, shiny and crystalline in structure 0.1 M acetic acid Clear liquid, resembles water Zinc oxide Very white powdery substance RAW RESULTS Data Specifided (Page 112 CRC handbook) Raw data Volume of Gas Collection Bottle (Average of 3 Trials) 14.04mL Mass of boiling tube (empty) 41.57g Mass of boiling tube with zinc carbonate 43.42g Mass of zinc carbonate 1.75g Volume of water in gas collection bottle after reaction 78.5mL Volume of gas product collected 185.2mL Mass of solid product with boiling tube after reaction 1.11g QUALITATIVE TEST RESULTS Group # Test Observation: Standard Positive/Negative Observation: Experimental Positive/Negative 1 H2 HCL + Zinc bubbling + flaming stick POP! + + flaming splint no POP - 2 CO2 Turned cloudy + Negated from experiment Negated from experiment 3 O2 MgO2 + Hydrogen Peroxide bubbling. Glow stick re-ignited + + wooden splint; glowing stick went out - 4 H2) Added 1 pea size CuSulfate + 1 drop of deionized water; blue, positive + Copper sulfate did not change color when put into wet filter paper - 5 Zn (OH)2 Zinc iodide + 3mL H2O Clear suspension + Visual inspection; cloudy. Acid test= solid + 3M Acetic acid cloudy + 6 ZnO ZnO + Heat yellow Zn Cooled White + ZnCO3 + heat yellow solid.
NaHCO3 (sodium bicarbonate - baking soda) and HCl (hydrochloric acid). The bubbles formed are carbon dioxide. HCl (hydrochloric acid) and BTB (bromothymol blue). Bromothymol blue is one of many acid-base indicators. What color do you observe?
Art History I Chapter Seven Summary Roman Art – Key Ideas: Roman Art Roman temples developed during the Republican period echo the Greek prostyle plan. Early evidence of Roman building characteristics can be seen in the sanctuary of Fortuna Primigenia at Palestrina, east of Rome. From early 1st century, this complex shows an early use of concrete, barrel vaults, and engaged columns. The Forum of Caesar, constructed during the end of Julius Caesar’s life, furnished the prototype for all later Imperial forums. Impressive examples of Roman architecture in the Provinces include the Pont du Gard and Maison Carree in Nimes.
49 of No. 3. College Art Associatio, 1967. http://www.jstor.org/pss/. [6] Spieser, J. M. "The Representation of Christ in the Apses of Early Christian Churches." In Gesta, 63-73.
10/26/09 Egypt: quest for afterlife Second essay History 1001 Nilam Amatya [pic] The false door of redines (Old kingdom, Dynasty 6, 2323-2150 B.C) What is afterlife? What do we know about ancient Egypt and what it meant in Egyptian culture? Ancient Egypt that we know is mostly identified by its enormous pyramids, in particular the Great Pyramid at Giza, which was built during the middle of the third millennium, BC. These pyramids are massive monuments built over or around a crypt or tomb. These pyramids are served as royal tombs.
Beginning in 2100-2050 BCE with the Nanna Ziggurat the flat head pyramid was seen in usage in Iraq. Keeping similar architecture style with the Khafre’s Pyramids built in 2520-2494 BCE located in Egypt present the structure of a three dimensional triangle. Both structures found in the Middle East can be compared similarly in the sense of shape, base, and structure while being built in different time periods with different resources and with distinct specific purposes. The Nanna Ziggurat is one of the most remarkable surviving archaeological remains. Ziggurats built above flat plains publically made known the wealth, and stability of city ruler’s and glorified its gods (Cothern and Stokstad 2011, 28).
They both used stone and mud bricks as the predominant building material. Ancient Egyptian houses were made out of mud collected from the Nile River. It was placed in molds and left to dry in the hot sun to harden for use in construction. There is consensus among historians and Egyptologists that the ancient Egyptians were the first builders ever known to man; they taught humanity how to design and erect buildings; thus laying grounds for human civilization, urbanization and man's settlement in a specific homeland of his own for the first time in history. Cities were built in cultivation land near the Nile River so the natural flooding would water their crops, and bring with it natural minerals needed by the crops.