asap please 1. Assume your analytical method requires a volume flow rate of 2.5 lpm. The required volume is 25 liters to 125 liters. Employees work four hours before lunch and four hours after lunch. What will be your sampling plan? Please explain fully.

02A: 2.1-2.5 and Accuracy Handout (70 min) ulate Figures of Merit for Trueness ▾ Part A. Absolute Error A breathalyzer is a portable electrochemical instrument that measures the concentration of ethyl alcohol in a sample of exhaled breath A forensic chemist checks the calibration of a breathalyzer by testing a standard air sample known to contain 0.174 mg/L of ethanol seven times. The average value of these seven replicate measurements is found to be 0 157 mg/1 Calculate the absolute error of the breathalyzer. 1971 ΑΣΦΑ Submit Previous Answers Request Answer ? Previous x Incorrect; Try Again: 4 attempts remaining Q Search mgl ly Colle 16 of 17 E dx Next 11:44 PM 1/31/202 BANG &

A standard reference material is certified to contain 94.6 ppm of an organic contaminant. Your analysis gives you the follow values, 98.6, 98.4, 95.1 and 97.2 ppm. Can you say with 95% confidence that your values differ from the certified value. Please show work

1. A wastewater sample has the following composition: NO3 = 37 mg/L as N CO3²-2.5 x 10 mol/L PO4³ = 10 meq/L Ca²+ = 75 mg/L as CaCO3(s) Express each of the above concentrations in mg/L, mol/L, meq (of charge)/L, and ppm. Make and list any necessary assumptions. Show your work and summarize the results in a table.

Calculate the concentration (Mdil) of potassium permanganate (KMnO4) when 600 mL (Vconc) of the potassium permanganate solution is added to 400 mL of water. Note: first add the potassium permanganate solution (choose dropper) in the absence of water, move the sensor over the solution, and determine the concentration of the solution prior to adding water (Mconc). Knowing these three pieces of data, you can now calculate (Mail), and enter this calculated number as your answer. You can also confirm your answer by adding 400 mL of water to your 600 mL of potassium permanganate solution and checking the concentration with the sensor (NOTE: the sensor concentration will likely be slightly off the calculated number since it's difficult to add exact volumes in the simulator). Please report your numerical answer only with three significant figures and NO units (eg., 1.23). Mdildil MconcVconc A R

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

Which is correct?     Random errors affect accuracy and systematic errors affect precision.     An accurate result shows agreement with the true or accepted value.     Precise results can contain significant random error, but little systematic error.     The standard deviation is a good measure of accuracy.   Polydimethylsiloxane (PDMS) stationary phases have low polarities.  Which of the following statements is TRUE about gas chromatography using PDMS stationary phases?     The gas chromatography column is typically packed with silica microparticles.     An oven is used to control the column temperature because a constant temperature is always needed in gas chromatography     Octane (C8H18, boiling point: 126 ºC) is eluted later than dodecane (C12H26, boiling point: 216 ºC)     3-Pentanone ((C2H5)2CO, boiling point: 102 ºC) is eluted later than propanol (CH3CH2CH2OH, boiling point: 97 ºC)

Part A What mass of KBr (in grams) should you use to make 100.0 mL of a 1.70 M solution of KBr? Express the mass to three significant figures and include the appropriate units. m = Submit 0 μA Value Provide Feedback Request Answer Units ?

E ! G Google Docs: Online Document Editor | Google Workspace Hiranrat_Analysis_CHM235LL DO File Edit View Insert Format Tools Extensions Help A P 100% F1 C Pure A: Pure B: Pure C: Compound 2 F2 Normal text A 146 1 BO с O junk O Crude Fractions. The following table shows a sequence of TLC "lanes" that correspond to fractions collected from a column. After completing the column, a student wants to condense containers while maintaining high purity for each of the components, then what fractions, if any, can be combined to provide # 3 Y 1 2 80 F3 O Times New... Y - 11 + 213 Oo 3 2 0 0 0 0 0 0 0 $ 4 Last edit was 2 minutes ago B IU A UA 45 S Fractions from column 000 F4 6 docs.google.com Hiranrat Analysis_CHM235LL - Google Docs % 5 F5 6 O GOD O O 2 = 2 MacBook Air F6 & 7 6 E 7 F7 Solvent Front Starting Line T 8 DII IE = E 8 9 y DD C F9 pe

1. As shown below, a student obtains two quality chromatograms for her distillate and pot samples, containing methanol and cyclohexanol. Match Chromatograms A and B with distillate or pot, and explain your conclusion. Circle your response: Chromatogram A A: Distillate or Pot Explain your answer: t=0 Chromatogram B B: Distillate or Pot