203L PostLab_Ex5

An organic chloro-compound has the molecular formula: C₁4H22Cl2. Give the ratio of the% (M+2)* to M* peak intensity for the above compound to two decimal places. The masses in Daltons of selected isotopes and their abundances are given in the table below: Isotope abundance and mass data Element Mass (Da) 1.00783 12.0000 14.0031 15.9949 18.9984 27.9769 30.9738 31.9721 34.9689 78.9183 126.9045 H C N F Si P S CI Br I Mt Isotope H-1 C-12 N-14 0-16 F-19 Si-28 P-31 S-32 Cl-35 Br-79 I-127 ANS - (M+2)/M* (%) = (M+1) Isotope H-2 C-13 N-15 0-17 F-20 Si-29 P-33 S-33 CL-36 Br-80 I-128 Abundance 0.015 1.08 0.37 0.04 0 5.1 0 0.8 0 0 0 (report the % to 2 decimal places) (M+2)* Isotope Abundance H-3 0 C-14 0 N-16 0 O-18 0.2 F-21 0 Si-30 3.4 P-34 0 S-34 4.40 CI-37 32.5 Br-81 98.0 I-129 0

Based on the data, calculate the concentration of analyte in the ORIGINAL sample in ppm. Report to 1 decimal place Sample: A 10.00 mL aliquot of the unknown was placed in a 100.0 mL volumetric flask and made up to the mark will distilled water. The absorbance of this solution is 0.185. Sample + Spike: A 10.00 mL aliquot of the unknown and a 13.00 mL aliquot of the 46.00 ppm stock were both placed in the same 100.0 mL volumetric flask and diluted to the mark with water. The absorbance of this solution is 0.326.   ( Please type answer note write by hend)

One of the spectra below is produced by 1-chloropropane and the other by 1-iodopropane. Which is which?

Hello please help with number 4.

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Qno3 solve please dont reject. Fill all and asignmnt list also fill dont reject okk

2

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CATION CONFIRMATORY TEST OBSERVATION ADDED REAGENT(S) OBSERVATIONS Excess NH3 NVR KSCN NVR K4Fe(CN)6 NVR K3Fe(CN)6 NVR Na2C2O4 NVR NaOH (in evaporating dish) Litmus paper: red to blue   ANION CONFIRMATORY TEST OBSERVATION ADDED REAGENT(S) OBSERVATIONS HNO3, Fe(NO3)3 Blood red aqueous layer; colorless toluene layer HNO3, KMnO4 Peach aqueous layer; colorless toluene layer (to the ppt) CH3COOH White ppt does not dissolve MgCl2 NVR 6M H2SO4, FeSO4, 18M H2SO4 NVR     Select one or more: NH4+  CO32- Fe3+ SO42- Cu2+ NO3- Ca2+ I- Br- PO43- Zn2+ SCN-

Using the lab instructions and data table with data, please help me complete part 1 and 2 of my lab worksheet

Write the IUPAC name of each molecular formula

5 and 6

Continued... 5. Answer ALL parts of this question The stability of chloramphenicol in eye drops is being studied at different temperatures and times. The concentration (in mg/L) of chloramphenicol at three different temperatures over time is provided below. Time (day) -18°C 25°C 40°C 25 28 23 7 27 20 20 30 20 21 20 180 23 25 19 (a) Using the data in the tables below assess and explain if the reaction time (after 1 hour of the start of the reaction) was an important factor affecting the yield of the reaction and provide the null hypothesis of the statistical test carried out. (b) The amount of chloramphenicol at -18 °C seems to vary with some values appearing to be higher than others. Explain what may be causing this variation AND suggest a methodology to identify if there was a systematic error in the measurement. ||

Choose the suitable GC detector (Thermal conductivity, Flame lonization or Electron capture) which are described by the given statements. i) Organic compounds that can be burnt ii) Halogen-containing organic compounds for example pesticides iii) Organic compounds that can be ionized

What happen to the glowing wood splint when it is inserted inside the test tube?

I would need help getting a example/drawing and explanation of each words: Aliquot Analyte Aqueous Calibration curve Composition sample Decant

a.) H3O+ b.) PhCH₂O c.) d.) 1.) H2, cat. Pd/C 2.) H3O+ HO HO PTSA Benzene A - H₂O OH 1.) H2, cat. Pd/C Ph 2.) H3O+ e.) HCI “དྲི་ང་མ་ H3C OH OC(CH3)3 H₂O f.) PTSA Benzene Δ - H₂O

Q5: If the Ksp of Ca3N2 is 6.06 x 10-3, how many moles of calcium nitride (s) could you dissolve in 1.589 L of solvent (assume that calcium nitride (s) dissolves in water to form Ca2+(aq) and N3- (aq))? Enter your answer with at least 3 sig figs.    Please provide only typed answer solution no handwritten solution needed allowed

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Chemistry how can find the thin layer with EPMA (electron probe micro analyzer ? please Explain how can find this graph Anodizing: 1. A   please explain only this graphs

6. Relative Intensity Determine the molecular formula that goes with the following mass spectrum. Write this on the spectrum, and draw a structure that fits with this molecular formula. 100 80 69 20 m/z 51.0 52.0 53.0 9.7 6.6 3.3 77.0 18.8 78.0 7.3 79.0 8.9 89.0 7.5 104.0 7.4 105.0 3.2 106.0 72.5 107.0 5.9 140.0 32.0 141.0 100.0 142.0 8.0 143.0 31.7 144.0 2.3 tarantorpille 25 50 75 m/z 100 abou 125 [M]+ 141 amu

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?

is one able to help? please

Please don't provide handwritten solution ...

3. Using the data at right: a. Calculate the absorbance of each sample. You will need to express the %T values as decimals before calculating the logarithms. (e.g., for T = 25%, A = -log 0.25 = 0.602) b. Use the graph paper on the back of this page (or a spreadsheet) to plot absorbance vs. concentration. Make a proper graph, with labeled axes, uniform scales, etc. Use a ruler to draw the best-fit line.. C. Use the graph to find the concentration of the un- known sample. (Draw dotted lines on the graph showing how you found your answer.) CONCENTRATION PERCENT (ppm) TRANSMISSION 0 100.0 100 74.1 200 54.9 300 40.7 400 30.1 500 22.3 unknown 31.6 ABSORBANCE

In the HQS-Mg fluorescence part of Lab 6, a calibration curve is made of fluorescence intensity vs. MgCl2 concentration (M). The standard solutions for the calibration curve were made by mixing a small amount of 0.01 M MgCl2 with some HQS solution. Calculate the concentration of MgCl2 (M) in each of the following standards. Report your concentrations to 3 sig figs. Fluorescence Volume of 0.01 M Volume of 1 mM Concentration of MgCl2 (M) Intensity MgCl2 (mL) HQS (mL) 0.031250902 0.8 100 0.049490754 0.8 50 0.059803507 2 100 0.085834029 3.6 100 Hint: The total volume of each solution is volume of 0.01 M MgCl2 + volume of 1 mM HQS.

Direction: Match column A with column B. Write the letter of the correct answer. COLUMN A COLUMN B 1. C+ O₂ CO₂ a. Synthesis 2. Cu + 2Ag(NO3)2Ag + Cu(NO3) b. Decomposition 3. 2NaCl2Na + Cl₂ c. Single Displacement 4. CaSO4 + Mg(OH)2 Ca(OH)2 + MgSO4 d. Double Displacement 5. HCl + NaOH-NaCl + H₂O e. Combustion f. Acid-Base Reaction

Macmillan Learning The selenium content in soil can be determined fluorometrically upon conversion of the selenium to the fluorescent product shown, followed by extraction in cyclohexane. Emission from the fluorescent product is observed at 518 nm. a The selenium content in a 0.147 g soil sample was converted to the fluorescent product and extracted in 50.0 mL of cyclohexane. The method of standard additions was used to determine the selenium content in the soil sample. Initially, 3.00 mL of the cyclohexane solution were placed in a cuvette for fluorescence determination. Several small additions of a 2.66 µg Se/mL standard solution containing the fluorescent product were added to the 3.00 mL solution in the cuvette. The fluorescence was measured at 518 nm. The results are shown in the table. Total added Se standard volume (µl) 0.00 20.0 40.0 60.0 80.0 Se wt% = 50625 Fluorescence intensity (arbitrary units) Determine the weight percent (wt%) of selenium in the soil sample and find the…

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The two spectra below correspond to 2-butanol (CH3CH2CH(OH)CH3) its isomer, 2-methyl-1-propanol ((CH3)2CHCH2OH).  Draw these two isomers, and assign the correct spectrum to each isomer.  Explain what spectral data you used to reach your conclusion.

After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40, a student found that her best fit linear line for FD&C Red 40 was y = 2,681x + -0.002. Her Kool-Aid sample had an absorbance of 0.337. If 0.55 grams of Kool-Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her 8-fl oz cup?