involves two oxidation-reduction reactions to calculate the oxidizing capacity of a sample of unknown bleach. In order to determine the volume of Na2S2O3 added‚ students will conduct a titration of bleach with thiosulfate with addition of a starch indicator to find the end point of the titration. Moreover‚ the oxidizing capacity of bleach is calculated with the percentage by mass of NaOCl in the unknown bleach sample. The overall chemical reaction throughout the experiment will be balanced with the
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2024 Aluminum Lab Report Abstract “Age or Precipitation Hardening” effects on the 2024 Aluminum sample (Al-4%Cu) was investigated by conducting two sets of experiments on 5 samples. In the first experiment‚ 4 of the samples were artificially aged‚ and in the second experiment‚ only one of the 5 samples were naturally aged. In conclusion‚ it is concluded that the hardness of the samples is directly affected by the time and the temperature of the age hardening‚ so as the samples are age hardened
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BSC 2086C: Anatomy and Physiology I Lab 2: The Chemistry of Life Name ____ Directions: There are eight (8) activities in this lab. Please be sure to complete them all. For all questions‚ type your answers into the yellow box ____ (including your name above) it will expand as you write. Activity 1 1-1: Insert the chemical symbol in the answer blank for each of the following elements. ____ 1. oxygen ____ 2. carbon ____ 3. potassium ____ 4. iodine ____ 5. hydrogen ____
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Microbiology Laboratory Report Identification of Unknown Bacteria 03/10/05- 04/01/05 Authors: Richard Hendricks‚ Jessica Prebish; NMU Abstract: Broth culture 16 was randomly selected by our group and subjected to qualitative tests for taxonomic identification. The culture did appear homogenous throughout the testing period and is currently retained by Northern Michigan University’s department of Microbiology. We suggest that culture 16 is an example of Escherichia coli. Background: Techniques
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experiments is to determine specific gravity‚ absorption capacity‚ and fineness modulus of a f ine aggregate sample and to plot a gradation curve for the sample. The scope of the experiment was limited to one aggregate sample only. In determining the SSD and oven-dry weights needed for calculation of specific gravities‚ a conical mold was used to reach an SSD condition and the sample was later dried in an oven. Sieve analysis determined the particle size distribution by sifting the aggregate
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by the epidemic and it is the dependent variable. This is because it is the variable that is being tested‚ and it is reliant on the probability of infection. The sample size of the experiment is 3‚ which means every different increase of probability of infection was tested three separate times. It is desirable to increase the sample size of an experiment‚ because it decreases the amount of random and systematic errors made. It also provides more reliable and more accurate results‚ because you are
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II. HCV Sample Dilution and Inactivation From each sample 225 µL was transferred to a microcentrifuge tube‚ which containing 25 µL of Triton X-100 Solution; the tubes were Incubated 30 minutes at 37ºC‚ and then the samples were incubated at 56ºC for 30 min in water path (for dissotiation of HCV core antigen-antibody complex). Assay procedure 1. All reagents were leaved to reach room temperature before use‚ and then shacked thoroughly with no foam. 2. The number of strips required for the test
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507-531. Bejar‚ I.‚ Douglas‚ D.‚ Jamieson‚ J.‚ Nissan‚ S.‚ & Turner‚ J. (2000). TOEFL 2000 listening framework: A working paper (TOEFL Monograph Series Report No. 19). Princeton‚ NJ: Educational Testing Service. Berne‚ J. (1995). How does varying pre-listening activities affect second language listening comprehension? Hispania‚ 78‚ 316-329. Brett‚ P. (1997). A comparative study of the effects of the use of multimedia on listening comprehension. System‚ 25‚ 39-53. Brown‚ G. (1995). Dimensions of difficulty
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that changed your excitement into irritation‚ and then you said to yourself‚ “Shit! I forgot what my pin code is!” – that was exactly what I felt when our professor told us that we have to do an activity that we haven’t done before and then make a report about it. I was so excited about the “something you haven’t done before” part to the point I almost forgot that there were so many exciting
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Lab Report 1 Introduction: Proper chemical formulas entitle many challenges such as the Law of Multiple proportions that states that there may be more than one plausible mole ratio for the elements in that compound. However if we determine the mass of each element in the compound we will be able to get the true chemical formula. In this experiment‚ we used the law of definite proportions to find the chemical formula for a hydrated compound containing copper‚ chlorine‚ and water molecules
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