580102 Scientific Method Q

Analysis of Percent Organic Matter of * a soil sample was conducted and the data are shown below. Calculate the Percent Organic Matter of the sample. (Write answer with 3 significant figures with no %unit) Deionized water blank Reagent blank Sample with reagent Absorbance 0.001 0.089 1.231 Standard Solution (%) Absorbance 10 20 40 80 100 0.291 0.489 0.889 1.692 2.075

RAW DATA LABORATORY REPORT Mass of Mg(s) Final burette reading for Mg(s) procedure Difference in solution levels for Mg(s) procedure Atmospheric pressure, Patm (provided by lab instructor) Temperature of trapped gas (provided by lab instructor) 0.0769 77.42 138 102.5 18.5 mL mm H₂O kPa °C

analyte concentration(C)(mg/ml) injection volume (ul) elution time (time) peak DAD signal(mAU) caffeine 1 1 4.67 302.85 aspartame 5 1 7.53 15.83 benzoic acid 1 1 8.14 89.98 saccharin 1 1 1.91 84.86 mixture(add everything above with 1:1:1:1 ratio)   1 4.47 69.58 How to get the concentration of the mixture in this case?

A standard curve was produced using varying concentrations of KCl and the results are shown below. A sample of pond water was found to have a conductivity of 535 µS/cm. What is the concentration of total dissolved solids in the water sample? Recall the TDS constant is 0.67. CONDUCTIVITY (MICROS 1600 1400 1200 1000 800 600 200 0 Standard Curve of Conductivity vs Concentration Concentrations (M) 0.002 A. 392 mg/L B. 478 mg/L ✓C. 798 mg/L D. 247 mg/L 0.004 y = 132208x + 19.045 R²-0.9996 0.006 CONCENTRATION (M) 0.008 0.01 0.012

Pay close attention to whether you are provided the density/SG of the solution or the density of the solute (what is being dissolved in the solution). a. The density of sorbitol 70% w/w solution is 1.285g/ml. What is the concentration of sorbitol in the solution, expressed as a w/v% concentration? b. Try the same calculation, but instead of using the SG of the sorbitol solution, use the density of sorbitol powder (1.49g/ml) to convert sorbitol 70% w/w to a w/v% concentration. Do the calculation without using the density of the solution given to you in Question 1. (You should get pretty close to the same answer as in part a!)

DATA Note: Use the videos as references except when data is provided here. Table 1. Selection of Recrystallizing Solvent. Solvents Dissolution at room temperature? (+ or −) Dissolution at elevated temperature? (+ or −) Distilled water - - Acetone + n/a 95% ethanol - + Toluene + n/a              Solid sample: Naphthalene   Table 2. Mass Measurements.   Mass, g Sample solid 0.5021 Empty watch glass 35.7602 Watch glass with recrystallized sample 36.2485   Table 3. Melting Point Determination. Temperature, oC Appearance of Sample in Capillary Tube … Solid 78.4 Solid 79.3 Solid with signs of liquid 79.9 Solid, liquid 80.6 Liquid, solid 81.3 Liquid with signs of solid … Liquid Theoretical Melting Point, oC: 80.2°C (176.4°F)  QUESTIONS   Which solvent should be used as the recrystallizing solvent? Check if your chosen solvent satisfies all characteristics of a good…

C. Purification of Water 1.For this part of the experiment, watch the video on the link(s) below:  a. Flocculation: https://www.youtube.com/watch?v=5uuQ77vAV_U&t=82s Question:      Observation before flocculation. Observation after Flocculation

Home Tools Lab Experiment #... x ... +) 玩, 1 | 2 97.4% Record your observations following each reaction including changes in color and state of matter. AGNO3 (Ag*) Pb(NO3)2 (Pb²*) Ca(NO3)2 (Ca²+) а e i NazCO3 Light orange solid white, cloudy solid white, cloudy, solid (СО2) b NaOH f dark brown solid stay clear, liquid white, cloudy solid (OH) g k NazSO4 stay clear, liquid white, cloudy, solid white, cloudy, solid (SO?) d NaCl 1 white, cloudy solid white, cloudy solid stay clear, liquid (CF) .... Remember to complete and submit this table to your instructor before the end of the class session.

tion 12 - Chapter 10 Home X ezto.mheducation.com/ext/map/index.html?_con=con&external_browser=0&launchUrl=https%253A%252F%252Fclasses.alaska.edu%252Fwebapps%252Fport ter 10 Homework i 2 ts Skipped eBook Hint Print References + Mc Graw Hill NH4NO3 → (Click to select) N20 + Balance the chemical equation. Note that you must select "1" if that is the correct coefficient, though the "1" is not typically written in a balanced equation, but is implied. (Click to select) NH4NO3 5 2 1 JUL 11 Saved (Click to select) H20 AN 1 átv Help A S

5. A student mixed 5 mL of 3% m/v H202 with 10 mL of 0.5M IKI solution and measured the volume of water displaced over time. Use their data to prepare a plot of volume water displaced (mL) versus time (s) in Excel and find the rate of this run. Attach your spreadsheet and plot to your pre-laboratory assignment. Volume of Water Displaced (mL) Time (s) 2.0 39 4.0 76 6.0 106 8.0 137 10.0 166 12.0 192 14.0 222 16.0 242 18.0 20.0 270 302 Rate =

Please check image below. A. Primaquine PO4. How much Primaquine PO4 should be added to compound the whole batch? (Answer should be in grams. Round the final answer up to 2 decimal places. Example: 43.89g) * Formulation of Primaquine Phosphate Tablets, 30mg/ tab. Mg/tab 30 Formula Primaquine PO4 Lactose 56.6 |Starch PVP 16.6 0.57 | Stearic Acid 0.23 You are required to produce a batch of 600, 000 pieces of tablets. 2. Compute for the amount of each of the five (5) ingredients to be added during the compounding of the batch. (Answer should be in grams. Round the final answer up to 2 decimal places. Example: 43.89g) a) Primaquine PO4 b) Lactose c) Starch d) PVP e) Stearic Acid

nc.comwomen SC S X O MyLab x O Course X C Consta X C Suppo x C Nitron x C The Ai x https:/ x G Suppo x + ege.com/course.html?courseld=16985674&OpenVellumHMAC=d4abff74a80d41d197d6c57220120253#10001 View Available Hint(s) Value Units Submit Previous Answers Request Answer

A small intermittent fraction is collected and discarded. This is a good practice because     intermittent fractions contain unknown substances   intermittent fractions contain substances synthesized during distillation   intermittent fractions are composed of both unseparated components of the mixture   intermittent fractions are toxic   intermittent fractions decompose quickly over time

Data Collection Kinetic Data Collection Time, t (s) Volume of added base (mL) First addition 40 0.50 Second addition 101 1.00 Third addition 160 1.52 Fourth addition 224 1.99 Fifth addition 278 2.49 Sixth addition 334 3.01 Seventh additlon 389 3.48 Calculations Concentration of NaOH stock solution: 0.01 M Concentration of t-BuCl stock solution: 0.2 M Volume of t-BuCl solution: 10 mL stock stock solution added to 25 mL acetone Table view List view Kinetic Data Volume of Moles of Amount of t-Bucl (mol) [-Buc] In[-BuC Time, t (s) added base added base (mL) (mol) First addition 40 0.50 Second additlon 101 1.00 Third addition 160 1.52 Fourth addition 224 1.99 Flfth additlon 278 2.49 Sixth additlon 334 3.01 Seventh addition 389 3.48 Use the data in the table above to plot In[t-BuC]]; vs time (s). Include labelled axis, a title, and a linear trendline. Upload your plot here.

3 E D 20 F3 [Review Topics] [References] Use the References to access important values if needed for th a. When 52.70 and 44.375 are divided, the answer should be based on 4 Enter the answer with the correct number of digits. 52.70 44.375= 1.188 An error has been détected in your answer. Check for typos, miscalculations etc. before submitting your answer. C b. When 44.375 is subtracted from 52.70, the answer should be based on 2 decimal place(s). Enter the answer with the correct number of digits. 52.70 44.375= 8.32 Submit Answer $ 4 888 R F Retry Entire Group V % 5 Cengage Learning Cengage Technical Support F5 T G 6 4 more group attempts remaining B MacBook Air F6 Y H & 7 F7 U N * 00 8 J DII FB - M ( 9 K F9 O ) [ V 1 F12 11 21 ? 1

Table #2 Worktable for BCA Assay Standard Water (μl) Tube # 1 2 3 4 5 6 7 8 9 0 125 325 175 325 325 325 400 400 BSA source (μl) 300 stock 375 stock 325 stock 175 of tube #2 325 of tube #3 325 of tube #5 325 of tube #6 100 of tube #7 0 Protein (ug) Add the volumes listed in Table 2 to each tube. Add the water first and then the appropriate standard. Pipette each of the protein samples directly into the water, do not dribble on the side of the test tubes. The standard is at a concentration of 2 mg/ml and contains bovine serum albumin (BSA). Calculate the amount of BSA protein added to each of the tubes and write this in Table 2 (Protein (ug)).

← Chrome File Edit View History Bookmarks Profiles Tab Evolution of the Gex tab → 13.1 Solution Form.... M Gmail YouTube Maps Ghess law organic c..... M esc caps lock 75% D Sat 10:20 PM a Gp and reactants-G X Significant Figures X Bb Department of Che X M Mathway | Algebra x A ALEKS-Lara Althax www-awu.aleks.com/alekscgi/x/isl.exe/1o_u-IgNsikr7j8P3jH-lvTqeviKFP6W0cqJcWJdIACROQwyw24GWHin4XFyQvsTuo6422Ls2TWa4xMOJZaDSVCHQol7p3... ☆ O KINETICS AND EQUILIBRIUM Using Le Chatelier's Principle to predict the result of changing... Carbon disulfide and oxygen react to form carbon dioxide and sulfur dioxide, like this: CS₂(g)+30₂(g) → CO₂(g) +2SO₂(g) perturbation Some O₂ is removed. Some CO₂ is added. Suppose a mixture of CS₂, O₂, CO₂ and SO₂ has come to equilibrium in a closed reaction vessel. Predict what change, if any, the perturbations in the table below will cause in the composition of the mixture in the vessel. Also decide whether the equilibrium shifts to the right or left. Explanation 1…

Is number 11 a true or false statement and why? this is a non graded practice worksheet