Prelab Introduction to Qualitative Analysis part 2

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IN QUALITATIVE ANALYSIS OF GROUP 3 CATIONS , COMPLETE THIS TABLE AND WRITE THE CHEMICAL REACTIONS FOR THE IONS THAT OCCURED.   COMPLETE THIS TABLE:   Group IIICations ConfirmatoryReagent Result/Observation SubstanceFormed Inference

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PART ONE: Preparation of FECNS* Solution Prepare the two solutions in table 1 by accurately measuring the required volumes of distilled water and CNS into two labeled test tubes. The absorbance of the solutions must be measured soon after adding the Fe" solution from a buret. TABLE 1 Fe 5 ml 5S mL Solution Distilled Water CNS 2 mL Total Volume 3 ml 2 ml 10 ml 3 mL 10 ml In this part of the experiment you are to explore what the above quote means. As a PRELIMINARY Exercise, formulate a hypothesis as to what would happen under each of the following circumstances: 1. 1ml of 0.0020 M CNS' solution is added to the unused portion of solution 1 in the test tube 2. One drop of 0.20 M CNS solution is added to the unused portion of solution 2 in the test tube.

The spectroscopic data in the table is generated with five solutions of known concentration. Concentration (M) 0.0133 m= 0.0266 0.0532 0.106 0.213 Absorbance 0.1271 What is the intercept of the linear regression line? 0.08531 0.5388 1.069 Use a spreadsheet program, such as Microsoft Excel, to graph the data points and determine the equation of the best-fit line. 1.954 What is the slope of the linear regression line formed by these points? M-1

A chemist received a radioactive sample that is suspected to contain U, 23U and other elements. The authority wants to know the distribution, qualitative and quantitative composition of the sample. Propose with justifications, ONE Surface analysis technique that can be performed on this sample.

Read the following short piece titled "The Status of Qualitative Research in Criminology." by Jody Miller, read pages 69- 72. Discuss the validity and reliability issues in relation to qualitative studies.

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Absorbance 1.40 Beer's Law Plot 1.20 1.00 0.80 0.60 0.40 0.20 0.00 0 10 20 30 40 50 Concentration (M x 105) D The slope for the line is 80.23. Use the Beer's Law plot provided to determine the concentration for a solution with absorbance = 0.5786. M

You determine the Mg concentration of a water sample using atomic absorption spectroscopy (AAS). The sample is first diluted: 4.00 mL of the water sample is diluted to a final volume of 25.0 mL. The AAS reading for the diluted sample is 1.755 ppm. What was the Mg concentration of the original water sample, in ppm? (Enter the numerical value without units.)

Document1 - Word Search (Alt+Q) References Mailings Review View Help Write the corresponding letters to the following descriptions. Each proposal can be associated with 0 or 1 match and each letter is not necessarily associated with a proposal. a. [Ar] 4s? b. 1s 2s2p63s23p3 c. 1s2s2p2 d. [Ne] 3s23ps e. [Ar] 4s23d10 f. 1s22s! g. None of those answers 1. I am a halogen 2. I am a transition metal 3. I am alkaline 4. I have exactly 2 single electrons 5. I am the smallest of the atoms presented here 6. I have exactly 3 valence electrons 7.I am the most paramagnetic of the atoms presented here 8. I am the copper 9.I am isoelectronic with Ti2+ IF cessibility: Good to go IA 16 SIS

If Jotaro Kujo measured the amount of current that passes through a sample to measure the amount of analyte in the sample, what kind of method did he use?   Volumetric method   Spectroscopic method   Gravimetric method   Electroanalytical method

Dangerous Paint Stripper Jessica has a summer job working for the city parks program. She has been using a cleaner called “Graffiti Gone” to remove graffiti from the bathrooms. She has to take a lot of breaks, because the chemical makes her throat burn. It also makes her feel dizzy sometimes, especially when the bathrooms don’t have very many windows. On the label, she sees that the cleaner has methylene chloride in it. She feels like she’s managing to get the work done, but she is worried about feeling dizzy. She wants to find out more about this chemical, what harm it can cause, and whether there are safer ways to do this work. Questions for following story. 1. What went right in this situation? 2. What went wrong in this situation? 3. What steps should be taken in this workplace to make sure employees are better protected and prepared the next time?

[References] Use the References to access important values if needed for this question. Taking logarithms and antilogarithms is necessary to solve many chemistry problems. For practice, complete the following table, where N is a number. In N log N 26.7 --0.261 0.246 Submit Answer Retry Entire Group No more group attempts remain Visited eq req

A water sample was analyzed for iron content using the iron-phenanthroline method. Using the set of data from Question 15 (as presented below), Reagent Blank Absorbance Absorbance (au) Reagent Blank Absorbance 0.003 Concentration of Stock Solution: 10 ppm Volume of Stock Solution (mL) Total Volume of Standard Solution (mL) 0.50 10.00 1.00 10.00 2.00 10.00 3.00 10.00 4.00 10.00 5.00 10.00 Volume of Trial Unknown Solution (mL) 1 5.00 2 5.00 3 5.00 find the true concentration of Fe2+ of the original sample. A) 5.12 ppm B) 2.56 ppm 2.52 ppm D) 5.05 ppm Concentration of Standard Solution (ppm) Total Volume of Unknown Solution (mL) 10.00 10.00 10.00 Absorbance (au) 0.012 0.132 0.267 0.349 0.428 0.560 Absorbance (au) 0.289 0.296 0.281

7. Chemical Formula: C3H7NO₂ 1H, broad 12 10 2H, broad Final Answer 8 PPM 6 1H q A- 3H d 2 0

If an analytical method relies on a measurable property of an analyte that can be correlated with the amount of the said analyte, what type of analytical method is it?   Oxidative methods   Instrumental methods   Blank Correction methods   Classical methods

What is the importance of the following analytical methods in chemical analysis? i. UV-vis spectrophotometry ii. HPLC iii. GC

Give a detailed description of how these both analytical separation protocol will be employed to recover river bodies from heavy metals and particulate matter. I. Centrifugation II. Chemical precipitation

M Apple Google Disney ESPN Yahoo! Biomedical Careers Program Apple iCloud Yahoo Images Bing Google Wikipedia COWLv2 |... b D2L ☆ & G For the reaction r r Submit Answer prod03-cnow-owl.cengagenow.com Fe(s) + 2HCI(aq)→→→FeCl₂(s) + H₂(g) AH° = -7.4 kJ and AS° = 107.9 J/K D2L D2L D2L Facebook Twitter LinkedIn Use the References to access important values if needed for this question. The Weather Channel Yelp TripAdvisor b D2L M G C The maximum amount of work that could be done when 2.08 moles of Fe(s) react at 286 K, 1 atm is Assume that AH° and ASº are independent of temperature. Retry Entire Group 4 more group attempts remaining kj. +88 M

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The spectroscopic data in the table is generated with five solutions of known concentration. Concentration (M) 0.0179 0.0358 0.0716 0.143 0.286 Absorbance 0.1425 0.1896 0.5722 1.126 2.110

Why is strict implementation of LQMS (Laboratory Quality Management System) or GLP is necessary ? What are the elements ?

NO 85 At RI Astatin 209967 222.018 117 118 Uus Uuo Chunoctium unknown 84 Bi Po Pulonium [2002) 3 116 up Lv Livermorum nuncium own [298] unknown 69 70 Tm Thulum 168934 Yb Yicerbium 123055 102 101 Md No Mendelevium Nobellum 258.1 259.101 71 Lu Lutecium 174.967 103 Lr Lawrencium [262] DELL 2015 He org Stoichiometry (On Your Own) Solve the following stoichiometry grams-grams problems: 1) Using the following equation: 2 NaOH + H₂SO4 → 2 H₂O + Na₂SO4 How many grams of sodium sulfate will be formed if you start with 200 grams of sodium hydroxide and you have an excess of sulfuric acid? 2) Using the following equation: Pb(SO4)2 + 4 LINO3 → Pb(NO3)4 + 2 Li₂SO4 How many grams of lithium nitrate will be needed to make 250 grams of lithium sulfate, assuming that you have an adequate amount of lead (IV) sulfate to do the reaction?

Explain Qualitative Chemistry and Quantitative Chemistry .

The best fit curve line to an absorbance vs. concentration plot for standard solutions of a dye has a slope of 0.1815 mL/mg and intercept of 0.0477. A sample solution prepared of the same dye has an absorbance of 0.464 at the wavelength used to establish the Beer's law plot. What is the concentration of dye in the prepared solution? Select one: O a. 0.132 mg/mL b. 2.29 mg/mL O c. 0.464 mg/mL O d. 2.82 mg/mL e. 0.0365 mg/mL Next page Law Tutorial Part 2 Jump to... Exp #9 - Laboratory Practical► Worksheet étv A

The following Absorbance vs concentration of nitrite graph is obtained for a set of data: Absorbance Vs Concentration y = 1.6628x+0.0373 R? = 0.9893 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0.2 0.4 0.6 0.8 1 Concentration of nitrite (mg/L) Determine the concentration of unknown solution for which the absorbance is determined as 0.69 A. More data is required В. 0.69 С. 0.65 D. 0.39 Absorbance

A direct ELISA experiment was done to determine the amount of protein present in a sample. A standard curve was prepared by plotting log Absorbance versus log concentration of protein in (ng/mL). The equation of the line is Y= 0.895 X -1.25. If an unknown protein shows an absorbance of 1.23. Calculate the concentration of this protein in the sample in (ng/mL).

how do i find x？

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Explain the importance of analytical chemistry in medicine. As well as: 1. Chemical chemistry 2. Medicinal chemistry 3. Pharmacology 4. Toxicology

Which of the hypothetic equations below is incorrectly balanced:   a. 2 X + 3 Y2Z4  → 1 X2 (Z4)3 + 6 Y2   b. 2 D2F4G + 5 G2 → 4 DG2 + 4 F2G   c. 2 KLMN3  → 1 K2MN3 + 1 MN2 + 1 L2N   d. 1 J12B22C11 → 12 J + 11 B2C   e. 1 ABC4 → 1 AB + 2 C

The concentration of methylene blue in the sample is estimated through (select the correct)   options:   refractive index measurement (refractometry).   turbidity measurement (turbidimetry).   absorbance measurement (spectrophotometry).   titration with 2% HCl solution.