Lab Report Essay Assignment Project
Order ID 53563633773 Type Essay Writer Level Masters Style APA Sources/References 4 Perfect Number of Pages to Order 5-10 Pages Description/Paper Instructions
Lab Report Essay Assignment Project
Separation of a MixtureIntroduction: This experiment separates a mixture using the physical property of solubility. You will learn decantation and filtration and will use a hotplate to evaporate a liquid.You will use the Law of Conservation of Mass to check your
accuracy.Background:Mixtures are combinations of substances in which the components keep their individual characteristics, can be mixed in variable proportions and can be separated by simple physical means. Contrast this with the composition of compounds that are inseparable by
physical changes. Some of a mixture’s components have physical properties like melting point, boiling point, or solubility that allow us to selectively remove one component from the mixture.Then the percentage of each component in the original mixture can be calculated. Example:A
student has a mixture of NaCl(s) and I2(s) weighing 2.75 grams.She heats the mixture, which turns the solid iodine into a purple gas. The salt remains as a solid.After cooling the salt, it weighs 1.59 g.To find the mass of iodine in the original sample, the student assumes that the
difference in mass of the mixture and the salt is the mass of the iodine originally present.Thus: (2.75 g mixture – 1.59 g salt) = 1.16 g iodine The percent of iodine in the mixture: (1.16 g iodine / 2.75 g mixture) x 100 = 42.2% iodine in this mixtureTo find the percent of salt in the mixture:
(1.59 g salt / 2.75 g mixture) x 100 = 57.8% salt in the mixtureMaterials: Procedure: WEAR YOUR GOGGLES! Obtain a sample (approximately 2.0g) of mixture of sand and salt of unknown composition. Record the sample number in your laboratory notebook.Determine the mass of a clean
and dry beaker on a balance to the nearest 0.01 g.Empty all of your sample into the beaker and determine the mass of the beaker and the sample.Measure 25-mL of distilled water in the graduated cylinder and add the water to the beaker with the mixture. Stir thoroughly with the stirring
rod to dissolve the salt. You may want to gently heat this mixture. While salt is very soluble in water, it can take some time for complete dissolution. Heating will speed this up. Determine the combined mass of a watch glass and a piece of filter paper. Record this mass. Fold the filter
paper, as shown in figure below, and fit into the funnel.Place the filter funnel on top of the Erlenmeyer flask. Moisten the filter paper with distilled water from the bottle and press it to the walls of the funnel, so that it adheres.Filter the mixture by decanting the liquid slowly into the center of
the funnel. The liquid filtered through will be collected in the Erlenmeyer flask.Note: Pour the liquid through the funnel at such a rate as not to overfill the funnel.After all the liquid has been filtered, use two 5 mL portions of water to transfer any sand remaining in the beaker to the filter
paper.10. Use three additional 5 mL portions of water to wash the material on the filter paper. (The first of these is also used to rinse the rubber end of the stirring rod that was used in transferring the sample).After all the water has dripped from the end of the funnel, carefully remove the
filter paper from the funnel (without tearing it) and place on the watch glass and place it in the drying oven to dry.When the sample is dry, determine the mass of the watch glass, filter paper and sand, and record in your notebook.Rinse the beaker clean, but not dry, and pour the liquid from
the Erlenmeyer flask into it.Place the beaker on a hot plate and heat carefully to evaporate the water off.GOGGLES ARE MANDATORY – HOT SALT SPLATTERSNote: Take caution not to overheat the beaker and splatter the salt. To avoid loss ofsample due to spattering, when the water
level becomes low, heat at a gentler rateuntil you hear popping sounds. At this time remove the beaker from the hot platecarefully, and return when the popping action has stopped.Remember to turn off the hot plate when done.When all the water has been evaporated, remove the beaker
from the hot plate carefully, and let cool on the bench. Do NOT place the hot beaker directly on the benchtops. Instead place the beaker on top of a wire gauze. After the beaker has cooled to the touch, determine its mass with the salt, and record this value in your notebook. Place the
beaker on the hot plate again, and carefully heat a few more minutes, watching closely for signs of excessive spattering.After the second heating, remove the beaker, cool, and determine its mass again. Record in your notebook.Compare the first and second mass obtained for the beaker
and the salt. If you have dried your sample properly, the difference should be within 0.1 g. Use the lower mass value for your calculations.If your values are not within 0.1g of each other, continue drying until two such values are obtained. Disposal:The sand can be tossed in the trash and
the salt rinsed into the sink.Since there were only two components in the mixture, the percent recovered should equal 100. Any deviation from 100 is an indication of the accuracy of your work.You will write a lab report for this lab. Your lab report should include:Abstract: State the
objective of the lab, the means by which this objective was accomplished and the results obtained. Background: Explain what a mixture is and how the components of a mixture can be separated. Outline the process used to separate this mixtureData: Reproduce the data table below and
incorporate it into your lab report. Analysis: Show the calculations needed to arrive at the percent recovery, the percent sand and the percent salt in your mixture. Ask your instructor for the actual mixture composition and report your percent error for both the percent salt and the percent
sand. Include a brief summary paragraph of the discussion questions at the end of your lab.Conclusion: Restate your results. If your results deviated from those expected explain what specific errors might have occurred. Your explanation must be aligned with your results. Staple to the
back of your report the hand written data sheet completed in lab and answers to the questions. Name______________________________ UNKNOWN NUMBER :_____________Data Table:*Please show any calculations needed for #’s 8 – 14 below this table.Calculations (make sure to assign a
number to your calculations that corresponds to the data table above)Analysis Questions: (make sure to include your responses to the questions below in your lab report, in the discussion section of your lab report)Many students do not recover 100% of the original mixture.Describe at
least two possible problems that could cause less than 100% recovery of the mixture.A student received a mixture that actually contained 50.0% salt and 50.0% sand.At the end of the experiment, this student calculated that his sample was composed of 45.2% salt and 54.8% sand. What
might he have done (or not done correctly) during the experiment to cause this error in his results?A student obtains the following data:Mass of evaporating dish 25.87 gMass of dish with mixture sample 28.12 gMass of beaker 146.36 gMass of beaker with dried salt 147.10 g Mass of
evaporating dish with dried sand ???However, this student spills her sand sample out of the evaporating dish before weighing it.If the student believes in the Law of Conservation of Mass, what should have been the weight of the evaporating dish with the sand in it? Show your work.4. A
student receives a sample of a mixture with three components, solid iodine that is removed first from the mixture by evaporation, solid salt that is dissolved to separate it from the third component, solid sand.The salt and sand are dried and weighed but the iodine escapes as a gas and is
not recovered.The student starts with 8.35 g of mixture and recovers 2.37 g of salt and 4.11 g of sand.What is the percent of each component in the original mixture?Show your work.(Attach a separate sheet of paper, if necessary.)
RUBRIC
QUALITY OF RESPONSE NO RESPONSE POOR / UNSATISFACTORY SATISFACTORY GOOD EXCELLENT Content (worth a maximum of 50% of the total points) Zero points: Student failed to submit the final paper. 20 points out of 50: The essay illustrates poor understanding of the relevant material by failing to address or incorrectly addressing the relevant content; failing to identify or inaccurately explaining/defining key concepts/ideas; ignoring or incorrectly explaining key points/claims and the reasoning behind them; and/or incorrectly or inappropriately using terminology; and elements of the response are lacking. 30 points out of 50: The essay illustrates a rudimentary understanding of the relevant material by mentioning but not full explaining the relevant content; identifying some of the key concepts/ideas though failing to fully or accurately explain many of them; using terminology, though sometimes inaccurately or inappropriately; and/or incorporating some key claims/points but failing to explain the reasoning behind them or doing so inaccurately. Elements of the required response may also be lacking. 40 points out of 50: The essay illustrates solid understanding of the relevant material by correctly addressing most of the relevant content; identifying and explaining most of the key concepts/ideas; using correct terminology; explaining the reasoning behind most of the key points/claims; and/or where necessary or useful, substantiating some points with accurate examples. The answer is complete. 50 points: The essay illustrates exemplary understanding of the relevant material by thoroughly and correctly addressing the relevant content; identifying and explaining all of the key concepts/ideas; using correct terminology explaining the reasoning behind key points/claims and substantiating, as necessary/useful, points with several accurate and illuminating examples. No aspects of the required answer are missing. Use of Sources (worth a maximum of 20% of the total points). Zero points: Student failed to include citations and/or references. Or the student failed to submit a final paper. 5 out 20 points: Sources are seldom cited to support statements and/or format of citations are not recognizable as APA 6th Edition format. There are major errors in the formation of the references and citations. And/or there is a major reliance on highly questionable. The Student fails to provide an adequate synthesis of research collected for the paper. 10 out 20 points: References to scholarly sources are occasionally given; many statements seem unsubstantiated. Frequent errors in APA 6th Edition format, leaving the reader confused about the source of the information. There are significant errors of the formation in the references and citations. And/or there is a significant use of highly questionable sources. 15 out 20 points: Credible Scholarly sources are used effectively support claims and are, for the most part, clear and fairly represented. APA 6th Edition is used with only a few minor errors. There are minor errors in reference and/or citations. And/or there is some use of questionable sources. 20 points: Credible scholarly sources are used to give compelling evidence to support claims and are clearly and fairly represented. APA 6th Edition format is used accurately and consistently. The student uses above the maximum required references in the development of the assignment. Grammar (worth maximum of 20% of total points) Zero points: Student failed to submit the final paper. 5 points out of 20: The paper does not communicate ideas/points clearly due to inappropriate use of terminology and vague language; thoughts and sentences are disjointed or incomprehensible; organization lacking; and/or numerous grammatical, spelling/punctuation errors 10 points out 20: The paper is often unclear and difficult to follow due to some inappropriate terminology and/or vague language; ideas may be fragmented, wandering and/or repetitive; poor organization; and/or some grammatical, spelling, punctuation errors 15 points out of 20: The paper is mostly clear as a result of appropriate use of terminology and minimal vagueness; no tangents and no repetition; fairly good organization; almost perfect grammar, spelling, punctuation, and word usage. 20 points: The paper is clear, concise, and a pleasure to read as a result of appropriate and precise use of terminology; total coherence of thoughts and presentation and logical organization; and the essay is error free. Structure of the Paper (worth 10% of total points) Zero points: Student failed to submit the final paper. 3 points out of 10: Student needs to develop better formatting skills. The paper omits significant structural elements required for and APA 6th edition paper. Formatting of the paper has major flaws. The paper does not conform to APA 6th edition requirements whatsoever. 5 points out of 10: Appearance of final paper demonstrates the student’s limited ability to format the paper. There are significant errors in formatting and/or the total omission of major components of an APA 6th edition paper. They can include the omission of the cover page, abstract, and page numbers. Additionally the page has major formatting issues with spacing or paragraph formation. Font size might not conform to size requirements. The student also significantly writes too large or too short of and paper 7 points out of 10: Research paper presents an above-average use of formatting skills. The paper has slight errors within the paper. This can include small errors or omissions with the cover page, abstract, page number, and headers. There could be also slight formatting issues with the document spacing or the font Additionally the paper might slightly exceed or undershoot the specific number of required written pages for the assignment. 10 points: Student provides a high-caliber, formatted paper. This includes an APA 6th edition cover page, abstract, page number, headers and is double spaced in 12’ Times Roman Font. Additionally, the paper conforms to the specific number of required written pages and neither goes over or under the specified length of the paper. GET THIS PROJECT NOW BY CLICKING ON THIS LINK TO PLACE THE ORDER
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