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Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter20: The Representative Elements

Section: Chapter Questions

Problem 40E

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3. Assume that you have a piece of intrinsic silicon.
(a) You are trying to make a device that requires the silicon to be doped p-type. What dopant
can you use?
(b) If the silicon is doped with 1017 boron atoms/cm³, determine the hole concentration.
Assume that all the boron atoms have been ionized. Write all formulae and values of
constants very clearly.

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If an electric current is passed through molten sodium chloride, elemental chlorine gas is generated as the sodium chloride is decomposed. :math>2NaCl(1)2Na(s)+Cl2(g) at volume of chlorine gas measured at 767 mm Hg at 25 °C would be generated by complete decomposition of 1.25 g of NaCl?
What possible uses exist for the natural gas liquids that are removed from natural gas during its processing?
If 1.5234 grams of H2C2O4·2H2Ois dissolved in water to prepare a0.250 L solution, identify the equipment needed for this preparation.
i saw this in a book called chemistry principle and reactions. I was wondering if you could help me answer it with solutions. the answer is 1.7 x 10^6
The maximum wavelength of light that a certain silicon photocell can detect is 1.11 μm. (a) What is the energy gap (in electron volts) between the valence and conduction bands for this photocell? (b) Explain why pure silicon is opaque.
Which of these statements about alloys and intermetallic compoundsis false? (a) Bronze is an example of an alloy. (b) “Alloy”is just another word for “a chemical compound of fixedcomposition that is made of two or more metals.” (c) Intermetallicsare compounds of two or more metals that have a definitecomposition and are not considered alloys. (d) If you mixtwo metals together and, at the atomic level, they separate intotwo or more different compositional phases, you have createda heterogeneous alloy. (e) Alloys can be formed even if the atomsthat comprise them are rather different in size.
12. Which one of the following statements is INCORRECT: (A) X-ray crystallography can give the three-dimensional arrangement of all the atoms in a molecule The ratio of the two main isotopes of Cl (chlorine) is about 3:1 (B) (C) The index of hydrogen deficiency (IDH) for C5H8O is 4. (D) Generally speaking, the longer the wavelength of the UV-Vis spectrum maximum (2max), the more conjugated the molecule is. The energy of photons used in UV-Vis spectroscopy is much higher than those used in NMR spectroscopy. (E)
Calculate the mass of KI needed to saturate 111.11g H20 at 20° C.
Why the semiconducting properties of silicon are improved by adding minute amounts of boron?
What are the various phases of SiO2?
Consider we have a silicate glass composition, this composition as shown below in percent by weight 15Na₂O +5K₂O + 2.5MgO +9.5 CaO +6 BaO + 5Al₂O3 +57 SiO₂. First, convert this composition to mole percent. Then classify each oxide added to the glass according to Sun's bond criteria. According to this classification, is this composition make glass or not? Min MO K Mg Ca Al Si Valance 1 1 2 2 2 3 4 Dissociation energy per MOX (in Kcal.) 120 115 222 257 260 402 424 Coordination Number 6 9 6 8 8 4 4 Molecular weight of oxides is shown below Oksitier (Molekil Agri): NajO (61.97), K,0 (94.18), MgO (40.31), CaO (56.08), Bao (153.33), ALO, (1015), 50, (60.08) Single Bond Strength (Kcal/mole) 20 13 37 32 33 101 106
Sketch the silicon–oxygen tetrahedron and explain how these fundamental building blocks join together to form other silicate structures.

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