SNC 2DO EXAM REVIEW January 2014 The exam is based on the entire semesters work. Chemistry 1. Label the following on a periodic table: a) Alkali metals b) Alkaline earth metals c) Halogens d) Noble gases 2. Indicate the metals‚ non-metals and metalloids. -38100431803. Show the trends for reactivity and atomic radius. 4. Which of the following elements has the largest atomic radius? Why? a) fluorine b) oxygen c) nitrogen d) calcium Calcium has the largest atomic radius
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Conductivity in metal-organic frameworks Metal–organic frameworks (MOFs)‚ are a class of crystalline materials whose crystal structure is made up from metal-containing clusters connected by multidentate organic linkers1‚2. MOFs are attracting considerable attention due to the possible rational design of crystal structures of coordination frameworks with versatile metal ions and organic ligands. In principle‚ MOFs topologies along with intermolecular distances between various building blocks can be
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therefore required three coordinates‚ or three quantum numbers‚ to describe the orbitals in which electrons can be found. The three coordinates that come from Schrödinger’s wave equations are the principal (n)‚ angular (l)‚ and magnetic (m) quantum numbers. These quantum numbers describe the size‚ shape‚ and orientation in space of the orbitals on an atom. The principal quantum number (n) describes the size of the orbital. Orbitals for which n = 2 are larger than those for which n = 1‚ for example. Because
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CHM113 summer 2014 Name: __________________________ EXAM 4 SHOW YOUR WORK 1) Of the molecules below‚ the bond in __________ is the least polar. A) HBr B) HI C) HCl D) HF E) H2 2) Ethanol (C2H5OH) melts at -114°C. The enthalpy of fusion is 5.02 kJ/mol. The heat capacity of solid and liquid ethanol are 0.97 J/g-K and 2.3 J/g-K‚ respectively. How much heat (kJ) is needed to convert 25.0 g of solid ethanol at -135°C to liquid ethanol at -50°C? A) 207.3 B) -12.7 C) 6.91 D) 4192 E)
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Chemistry 110 Midterm 1 October 11‚ 2005 1. What are the possible values for the orbital angular momentum quantum number l given the following values for the other three quantum numbers: n = 4‚ l = ?‚ ml = 0‚ ms = +1/2 A. B. C. D. E. 0 1‚ 2‚ 3‚ or 4 3 0‚ 1‚ 2‚ or 3 none of these answers 2. If the wavelength of an electron is equal to the radius of the n=2 orbit in He+‚ what must the velocity of the electron be? A. B. C. D. E. 6.88 x 106 m/s 1.38 x 107 m/s 3.44 x 106 m/s 5.47 x 105 m/s The velocity
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complexes form‚ the electron donating groups (called ligands) form coordinate covalent bonds through empty orbitals on the metal ion. An example appears in Figure 1‚ where the copper(II) ion complexes with four ammonia molecules (the electron donor ligands) to form the square planar‚ copper-ammine complex cation. NH3 | H3N— Cu2+ —NH3 | NH3 Figure 1. The complex ion tetraamminecopper(II) [Cu(NH3)4]2+. Some polyatomic ligands have multiple lone pairs of electrons available for bonding to the central
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Chemistry 1211 Prof. Dan Schwartz Exam #2 Thursday‚ 3/13/2003 7:00 – 8:30 P.M. There is a single correct choice for each question. Answer all questions on the Scantron sheet by filling in the proper bubble with a #2 pencil. If you change an answer‚ erase the undesired mark thoroughly. Be sure to fill in the boxes for your student number‚ name and lab section; then correctly fill in the corresponding bubbles beneath them. A periodic table and other useful information are attached to the back
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about 1.90 BM. In regular octahedral Cu (II) complexes ground term is 2Eg and hence no orbital contribution is expected. The spin only magnetic moment value corresponding to one unpaired electron is 1.73 BM‚ but the observed values fall in the range 1.80-2.10 BM. The slightly higher value is due to the spin orbit coupling. In regular tetrahedral Cu (II) complex the ground term being a triplet state‚ orbital contribution is expected and theoretically predicted value of magnetic moment is 2.20 BM
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present in 117g of Na2 CI 2 moles 4) I have 54g of water (H2O) and 84 g of iron (Fe) do I have more moles of water or of iron I have more miles of water (54 g = 3 moles H20 ‚ 84g = 1.5 moles Fe) Arrangement of Electrons 1) Draw diagrams to show the electron arrangements to the following elements: Carbon‚ Fluorine‚ magnesium‚ sulfur 2) Write the electron arrangements of the following elements using the format shown above: lithium
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kinetics‚ which provide the basis for understanding the relationship of structure to stability and reactivity. Reactions are usefully described in terms of potential energy diagrams such as shown in Figure 3.1‚ which identify the potential energy changes associated with the reacting molecules as they proceed to products. The diagram plots the free energy of the system as a function of the progress of the reaction. For each individual step in the reaction there is a transition state representing the highest
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