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- Oxidations of alcohols to aldehydes and ketones and reduction of aldehydes and ketones to alcohols
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Recently Asked Molecular Chemistry Questions
Expert help when you need it- Q1:3 - Names of lonic Compounds (5pts) Complete the table with the positive ion, negative ion, and the name for the compounds. Use the subscript (X₂) and superscript (X²) buttons as needed.See Answer
- Q2:Complete the table with the positive ion, negative ion, and the formula for the compounds. Use the subscript (X₂) and superscript (X²) buttons as needed.See Answer
- Q3:3 - Names of Molecular Compounds (5pts) Complete the table with the name for the compounds.See Answer
- Q4:3 - Names of lonic Compounds (5pts) Complete the table with the positive ion, negative ion, and the name for the compounds. Use the subscript (X₂) and superscript (X²) buttons as needed.See Answer
- Q5:Examine the following image of water. Use that image to describe the compound. Then look up and record its density and melting point from the reference materials.See Answer
- Q6:You are expected to write a lab report on the experiment assigned to you by the module leader. The experiment could be one of the following that you have performed in Weeks 2 to 5 of the lab. 1) Residence time distribution for Tanks in Series 2) Degree of conversion and the reaction rate constant in a CSTR 3) Rate of settling in a vertical column 4) Level control in a liquid tankSee Answer
- Q7: ght atomic with as e aver S: 113 In, d 115 In, e aver- alculate otopes. nu of a al con- e atom. Bonding Forces and Energies whic 05 zamotan 100 2.15 Calculate the force of attraction between a Ca²+ and an O2- ion whose centers are separated by a y many ding distance of 1.25 nm. un Sen taken tance? ements atomic , what ecify? ers for in the ite the rons in ond to lowing Sonod sun ly ionic struc- ses? (H)22s22p63s23p64s¹ (c)2s22p 3s²3p63d¹04s²4p64d³5s² (02s²2p635² Th my off 2.14 (a) What electron subshell is being filled for the rare earth series of elements on the periodic table? (b) What electron subshell is being filled for the actinide series? 45-4p⁰ 2.16 The atomic radii of Mg and Fions are 0.072 and 0.133 nm, respectively. bood (a) Calculate the force of attraction between these two ions at their equilibrium interionic sepa- ration (i.e., when the ions just touch one another). plin (b) What is the force of repulsion at this same separation distance? BURSA 2.17 The orce of attraction between a divalent cation and a divalent anion is 1.67 X 10-8 N. If the ionic radius of the cation is 0.080 nm, what is the anion Gradius? 2.18 The net potential energy between two adjacent ions, EN, may be represented by the sum of Equations 2.9 and 2.11; that is, Thank you so much! EN (2.17) Calculate the bonding energy E, in terms of the pa- rameters A, B, and n using the following procedure: No, it's not. A B + " 0 5:59 ollowing ntly ionic on struc- ases? EN = and any Eo between the two ions. Calculate the bonding energy E, in terms of the pa- rameters A, B, and n using the following procedure: EN of the bonding energy (c) Mathematically determine the ro and Eo val- ues using the solutions to Problem 2.18, and com- pare these with the graphical results from part (b). 2.26 = → A B + r p" 2.20 Consider a hypothetical X-Yion pair for which e the equilibrium interionic spacing and bonding en- ergy values are 0.38 nm and -5.37 eV, respectively. If it is known that n in Equation 2.17 has a value of 8, using the results of Problem 2.18, determine explicit expressions for attractive and repulsive energies EA and ER of Equations 2.9 and 2.11. C 2.21 The net potential energy En between two adjacent ions is sometimes represented by the expression r 5G (2.17) + D exp(-) (2.18) Spr in which r is the interionic separation and C, D, 2.1 and p are constants whose values depend on the specific material. (a) Derive an expression for the bonding energy Eo in terms of the equilibrium interionic separa- tion Yo and the constants D and p using the follow- ing procedure: Mixe 2.25 + (i) Differentiate En with respect to r, and set the resulting expression equal to zero. Bon 2.27 +See Answer
- Q8:1- The FCC Lattice 1- Place the FCC lattice pattern ("flower" pattern) into the lattice frame so that a crystal model can be started at the lattice origin. 2- Add marbles to the lattice pattern, building in three coordinate directions. 3. Look at the crystal model you have made and try to determine the basic FCC unit cell. Remember, it must be a repeatable unit in the lattice (see figure below). 4- Using the ruler provided, measure the lattice constant, ag. in millimeters. 5. The marbles (atoms) have a diameter d = 0.5 inches (12.7 mm). Calculate the lattice constant, , for this lattice using d (see figure below). 6- Add or remove atoms from your model until you have developed the atomic plane with the highest atomic density. Calculate the planar atomic packing factor for the plane you constructed. To do that, refer to the last picture below: using d, calculate the surface of the spheres within the rectangle and divide by the surface of the rectangle. Planar Filling Factor = 7- Along which direction is the highest atomic density? (a) Along the cube edge (b) Diagonally across the face of the cube (c) Across the body diagonal (through the center of the cube) 8- Determine the coordination number, CN, for atoms in this crystal lattice. The coordination number is the number of atoms that one atom in the lattice touches. CN= 9. Determine the number of atoms there are in each unit cell (remember that some atoms are shared between adjacent unit cells). Atoms/U.C. 10-Calculate the packing factor for this crystal lattice (using d, calculate the volume of the spheres within the cube and divide by the volume of the cube). packing factor=/n2. The HCP Lattice 1- Place the HCP lattice pattern ("flower" patter) into the lattice frame so that a crystal model can be started at the lattice origin. 2- Add marbles to the lattice pattern, building in three coordinate directions. NOTE: Pay close attention to the difference in stacking between FCC and HCP structures shown previously (see previous page). 3- Look at the crystal model you have made and try to determine the basic HCP unit cell. Refer to the figures below for the geometry of the unit cell, as it is hexagonal rather than cubic. The a, parameter corresponds a side of the base hexagon and the c parameter to the tall edge of the unit cell. 4- Using the ruler provided, measure the lattice constants, q, and c, in millimeters. mm mm 5- Along which direction is the highest atomic density? (a) In the basal plane along to the a-axis (b) In the basal plane perpendicular to the a-axis (c) Along the c-axis 6- Determine the coordination number, CN, for atoms in this crystal lattice. 7- Determine the number of atoms there are in each unit cell (remember that some atoms are shared between adjacent unit cells). Atoms/U.C. 8- Calculate the packing factor for this crystal lattice (using d, calculate the volume of the spheres within the cube and divide by the volume of the cube). packing factor 9- Add or remove atoms from your model until you have developed the atomic plane with the highest atomic density. Calculate the planar atomic packing factor for the plane you constructed. To do so, refer to the last picture below: using d, calculate the surface of the spheres within the rectangle and divide by the surface of the rectangle. Planar Filling Factor = 10-Which of the other lattices that you have encountered does the HCP highest-packed plane resemble? None FCC BCCSee Answer
- Q9:5-4. What is the concentration of chlorine (in mg/L) of household bleach that contains 5.25 percent by weight of Cl₂? Assume the density of water = 1,000 kg/m³.See Answer
- Q10:5-8. Calculate the molarity and normality of the following: a. 200.0 mg/L HC1 b. 150.0 mg/L H₂SO4 c. 100.0 mg/L Ca(HCO3)2 d. 70.0 mg/L H3PO4See Answer
- Q11:5-9. Calculate the molarity and normality of the following: a. 80 μg/L HNO3 b. 135 µg/L CaCO3 c. 10 µg/L Cr(OH)₂ d. 1000 µg/L Ca(OH)₂See Answer
- Q12: MSE 110 Laboratory Manual Structure Characterization Properties Processing Performance Department of Materials Science and Engineering University of Arizona Tucson, AZ 85721 LAB 1: Atomic Spectra and Balmer's Experiment 1- Introduction: According to De Broglie's principle, particles with small masses and high velocity can exhibit quantum behavior. In effect, they behave like waves. Electrons orbiting around a nucleus indeed have wavelike characteristics. In particular, they interfere constructively to produce standing waves so that only the orbits which satisfy nλ= 2är are stable (where λ is the wavelength of the electron and r is the radius of the orbit). It derives that electrons can only exist on specific orbits with specific energies, as depicted for the simplistic Bohr hydrogen atom model in Fig. 1. E3 E2 hv Ef E1 hv-E-Ef Fig. 1: Left: Standing wave on a circular orbit. Right: Bohr hydrogen atom model. When an atom absorbs energy (for example in the form of an electric discharge), electrons can be promoted onto higher levels, but they eventually relax back down by re-emitting that energy in the form of a photon (Fig. 1). The photon energy if therefore a measure of the difference in energy between the atomic levels: hv Ef -Ei. The sum of all the photons emitted by an atom is called the "atomic spectrum” and contains information on all the electronic energy levels present in a given atom. = Balmer was the first to observe these atomic spectra back in 1885, although at the time he did not understand its relevance to quantization. Nevertheless, he was able to derive what is now known as the Rydberg constant which permits to quantify the difference in energy between electronic levels of the hydrogen atom. In this lab, you will use a modern spectrometer to duplicate Balmer's experiment and experimentally determine the value of the Rydberg constant. You will first assess the calibration and estimate the resolution of the spectrometer using a helium discharge lamp as a calibration standard. You will then use the spectrometer to measure the energy level of the hydrogen atom and derive an experimental value of the Rydberg constant. 2- Experimental Procedure: List of materials • An helium discharge lamp • A hydrogen discharge lamp A spectrometer Procedure Step 1: Calibration and resolution of the spectrometer 1- Log into the computer (click MSE110LAB) and open the SpectraSuite program. The software should display a flat spectrum (Fig. 2). 2- Bring the helium discharge lamp within an inch of the fiber connected to the spectrometer. 3- Turn on the lamp. A spectrum with multiple peaks should appear on the graph of the software. 4- Lower the Integration time (point A in Fig. 2) until the highest peak intensity is below the maxim of 4000 counts on the graph. Increase the Scans to Average (point B on Fig. 2) until the spectrum intensity stabilizes. 5- Save the spectrum (point C on Fig. 2). In the dialog box use the drop down menu to select the File Type as “Tab Delimited, No Header" (point D in Fig. 2). Browse to save the file on the Desktop. 6- Open Excel, browse for the file using "All Files" and open it. 7- Graph the spectrum on Excel. 8- From your data determine the wavelength resolution of the spectrometer. 9- Determine and record the wavelength of each peak at their maximum intensity. Step 2: Experimental derivation of the Rydberg constant. 1- Bring the hydrogen discharge lamp within an inch of the fiber connected to the spectrometer. 2- Turn on the lamp and lower the integration time as detailed in step 1. 3- Save and plot the spectrum with Excel as detailed in step 1. 4- Determine and record the position of the three peaks at their maximum intensity. A File View SpectrometProcessing Tools Window Help B Integration Time: Scans to 100 milliseconds 100 Boxcar A 1 Nonlinearity Data Sources RED Average: Width: Correction: Stray Light Correction: External Trigger: Normal II Strobe Lamp Enable: Electric Dark Correction: IK C Graph (A) x USB650 Q Q Q @ + 90 SATRI Acquisition Int time: 100ms, avg: 1, b No Pre-processor, Sco Result Properties Data Views Graph (A) Graph (A) Intensity (counts) 4000- 3000- 2000- SpectraSuite Save Spectrum ...Spectrometers Processing 0 USB2G40989 No Pre-processor, Scope Mode Filename: Browse... Spectrum View 120 100- 80- Desired Spectrum: Processed Spectrum File Type: OOI Binary Format Grams SPC CAMP-OX Tab Delimited 300 1000 Wavelength (nm) Tab Delimited, No Header D Save Close File name is required. 1000- Source: USB2G40989 400 500 Wavelength (nm): 1000.00 Oot Binary Format 600 700 Wavelength (nm) 800 900 1000 Fig. 2: View of the SpectraSuite software for collection of atomic spectra. ΜΕ 3- Calculations Knowing the wavelength resolution of the spectrometer, calculate the energy resolution (difference in energy between two adjacent measurement points), at 400 nm and 800nm. hc E = λ Express the energy resolution AE in Joules and in eV. Compare the values of the spectral line collected in step 1 to the National Institute of Standard and Technology values reported in Table 1. Intensity (relative) Wavelength (nm) 300 388.86 200 447.15 30 471.32 20 492.19 100 501.56 500 587.56 200 667.81 100 706.52 50 728.13 Table 1: Main lines of the atomic spectrum of helium from NIST. Estimate the Rydberg constant using the Balmer's relation: 1 λ = R H 1 22 - 1 n 2 Use Excel to plot versus λ (12/17) with n=3,4,5 and obtain the slope of the plot to derive the n Rydberg constant. Your report should include: 1- An Excel graph of atomic spectra for helium and hydrogen. 2- The energy resolution of the spectrometer at 400nm and 800nm in Joules and ev 3- A table comparing the values of helium spectral line collected experimentally to the standard values. 4- A discussion of whether the error on your measurement is within the wavelength resolution of the spectrometer. 5- A list of the spectral line for the hydrogen atom. 6- An Excel graph of versus 1 λ 1 1 and the derived Rydberg constant. 22 2 n 7- A discussion of how accurate your derivation is compared to the actual value and what could be the source of error./nHCP FCC lattice BCC measured 12.3mm a do 20mm 140m Measured do 45mm -70mm -> 17.3mm Calculated C21 mm-3 culculate ao 17.96mm CN 12 78.5% PPF B 44.66mm nighest density direction? Across me of the cube densest direction? atons Le (N 8712 CN PF PF atoms/u.c $74 PFF AFF Packmg Factor. 74.1% FCC BCC none/nSee Answer
- Q13:8. Suppose we used the particle in a three-dimensional cubic box as a crude model for the electron in a hydrogen atom. What value of 1 (the width of the box) would you have to use so that the energy of transition between the ground state (111) and the first excited energy level (112, 211 or 121) transition for this model would be the same as the exact value determined for the n = 1 → 2 from the Rydberg formula En = 2.1799 x 10-18/n²? Is this a reasonable value for the size of a hydrogen atom?See Answer
- Q14:Examine the following image of sodium chloride. Use that image to describe the compound. Then look up and record its density and melting point from the reference materials.See Answer
- Q15:2 - Formulas of lonic Compounds (5pts) Complete the table with the positive ion, negative ion, and the formula for the compounds. Use the subscript (X₂) and superscript (X²) buttons as needed.See Answer
- Q16:Examine the following image of iron(III) chloride. Use that image to describe the compound. Then look up and record its density and melting point from the reference materials. See Answer
- Q17:Complete the table with the positive ion, negative ion, and the formula for the compounds. Use the subscript (X₂) and superscript (X²) buttons as needed.See Answer
- Q18:Examine the following image of potassium carbonate. Use that image to describe the compound. Then look up and record its density and melting point from the reference materials.See Answer
- Q19:2 - Formulas of lonic Compounds (5pts) Complete the table with the positive ion, negative ion, and the formula for the compounds. Use the subscript (X₂) and superscript (X2) buttons as needed.See Answer
- Q20:3- Names of lonic Compounds (5pts) Complete the table with the positive ion, negative ion, and the name for the compounds. Use the subscript (X₂) and superscript (X2) buttons as needed.See Answer
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