Atmospheric chemistry is a branch of atmospheric science in which the chemistry of the Earth’s atmosphere and that of other planets is studied. Environmental chemistry is the scientific study of the chemical and biochemical phenomena that occur in natural places. It can be defined as the study of the sources‚ reactions‚ transport‚ effects‚ and fates of chemical species in the air‚ soil‚ and water environments; and the effect of human activity on these. Environmental chemistry is an interdisciplinary
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increases thus large‚ pure crystals of precipitate was able to obtain. Subtracting the mass of the petridish alone from the mass of the petridish with CaC2O4 2H2O precipitate‚ one can get the mass of calcium oxalate dihydrate. And from that using stoichiometry‚ one can determine the mass of calcium. Based from what we have computed the resulted mass of calcium is 0.3267 grams. I. INTRODUCTION Gravimetric methods are quantitative methods that are based on determining the mass of analyte and one of
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The reactions are all exothermic‚ so the heat produced will be directly proportional to the amount of reaction that occurs. There’s an objective of this experiment and its • Measure the enthalpy change of a series of reactions • Determine the stoichiometry of an oxidation-reduction reaction in which the reactants are known but the products are unknown Materials • Lab Quest • Lab Quest App • Temp. Probe • Two 10mL graduated cylinders • Two 25mL graduated cylinders • Two 50 mL
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in concentration of the NO was (0.062 M - 0.100M) = - 0.038 M. Thus -2 x = - 0.038 and x = 0.019. Note: the negative sign indicates a decreasing concentration‚ not a negative concentration. The changes in the other species must agree with the stoichiometry dictated by the balance equation. The hydrogen will also change by - 0.038 M‚ while the nitrogen will increase by + 0.019 M and the water will
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Experiment 5 Gravimetric Determination of Sulfate Eisman E. Morales TA: Jackeline Pennywiit Chemistry 121 02/14/2011 Purpose: To determine the percent sulfate in a sample using a semimicro scale gravimetric procedure. Procedure: Refer to pages 41-42 of General Chemistry volume 1 Laboratory Experiments by Judith Casey and Robert Tatz‚ Hayden McNeil Publishing‚ 2010 Report Sheet See attached report sheet. Report Questions 1. Explain how your calculated value for percent
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Calorimetry: Enthalpy of Neutralization Introduction: The purpose of this lab experiment was to determine the molar concentration of the unknown HCl by using a coffee cup calorimeter. A coffee cup calorimeter is made of Styrofoam cups with a thermometer that is placed from the top and into the calorimeter to measure the temperature as the reaction happens. The Styrofoam cup used for the calorimeter creates an isolated system as it acts as a heat insulator between the cup and the surrounding
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Experiment 5 Title: Volumetric Analysis – stoichiometry Purpose: To determine the exact concentration of a monobasic acid‚ HX (KA1) Materials and apparatus: 1. Volumetric flask and stopper (250cm3) 2. Electric balance ±0.01 g 3. Pipette and pipette filler (25cm3) 4. Volumetric flask and stopper (100cm3) 5. Burettes (50cm3) 6. Retort stand and clamp 7. White tile 8. Wash bottle filled with distilled water 9. Spatula 10. Titration
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the lab had pinpoint accuracy. Proved by the data table below Trials Volume of Pb(NO3)2 Mol Pb(NO3)2 Mol KI Mass of Precipitate 1 1ml 0.0005 0.006 0.23g/0.0005mol 2 6ml 0.003 0.006 1.38g/0.003mol The numbers in the data table were just simple stoichiometry. For the first trial we took the moles of Lead(II)NItrate which is 0.0005 and since the ratio from the balanced chemical equation shows that we have a 1 to 1 ratio we don’t have to put a ratio in the equation. Then we would take the molar mass
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The data gathered and calculated in the experiment accurately portrayed the way the reactions would have taken place. The chloride analysis was a little bit off from other groups due to the fact that our AgCl was in clumps‚ creating less surface area‚ thus our product took longer to burn and may not have burned correctly compared to other groups; yet there are several experimental factors that could have caused us to have different results than other groups‚ i.e. different measurements for samples
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Level *0281936391* CHEMISTRY Paper 5 Planning‚ Analysis and Evaluation Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams‚ graphs or rough working. Do not use staples‚ paper clips‚ highlighters
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