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What does XRD and XRF methods are used for?
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- If a Schottky defect concentration of 6.2 x 1010 /cm3 is observed in Al2O3, what is the total vacancy concentration (in 1/cm3) present in this sample of Al2O3? a. 2.3 x 108b. 3.1 x 1010c. 6.2 x 1010d. 1.24 x 1011e. 3.1 x 1011 When compared to that of a covalent material, the short-range atomic structure of amaterial assembled using ionic bonding can be characterized as having a:a) higher coordination numberb) lower atomic packing factorc) higher atomic packing factord) lower coordinationnumbere) a and c onlyWhich of the following variables does absorbance not depend upon? A. Molar absorptivity of the solute. B. Path length of the sample. C. Concentration of the solute in solution. D. Conductivity of the sample.A solution of potassium permanganate of unknown concentration was analyzed against a standard of various concentrations. What is the concentration of KMNO4 if its absorbance is 0.678? Table 1. Data for the Standard Calibration Curve KMNO4 Standard Solution (mol/L) Absorbance at 525 nm 0.000400 0.112 0.000800 0.295 0.000120 l0.443 0.000160 0.701 0.00200 0.932 O 0.00173 M 0.00194 M O 0,00189 O 0.00155 M
- Choose true or false3) Use The CRC Handbook of Chemistry and Physics to determine the Ksp value for silver oxide. 0.00259 A920 100g H₂0A student prepared this calibration curve: Absorbance 0.6 0.5 0.4 0.3 0.2 0.1 0 Beer's Law Plot: Cobalt (II) Nitrate Standards 0.0000 0.0200 y = 5.5185x -0.0114 R² = 0.9995 0.789 M 0.0283 M 0.9997 M 0.0242 M 0.0400 0.0600 Concentration (M) 0.0800 0.1000 0.1200 Linear regression of the data yields an equation of y = 5.5185x-0.0114 with R² = 0.9995 What is the Molarity of an Unknown Solution that has Absorbance = 0.145
- The Graph below is an example of... * Absorbance 0.7- Mole Ratio Slope ratio Job's plot 0.6- 0.5- 0.4 0.3- 0.2 0.1 Yoe Jones Plot 0.0 Continuous Variation 0.2 0.4 0.6 Cm 0.8 1.0 1.2Which of the ff. wavelengths will avoid the problem of colored samples during turbidity measurements? 860 nm 500 nm 370 nm O 240 nm1. Make an acrostic definition of analytical chemistry 2. Summarize the common practices and application of analytical chemistry? 3. Explain the methods and techniques of analytical chemistry 4. What does analytical chemist do in research (analytical) process?
- What is the maximum number of unpaired delectrons that anatom or ion can possess? Give an example of an atom and an ionthat have this number.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?I’m not sure if question 5a and 5b are right or not
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