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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?
What volume of acetylene measured at standard conditions could be obtained from 10 grams of calcium carbide?
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.
Using the information from the previous question (where you determined the partial pressure of CO2), calculate the theoretical volume of CO2 that would be produced by this reaction using the Ideal Gas equation (PV=nRT). ( using 0.650 g SrCO3 at a temperature of 27 °C and a barometric pressure of 750 mmHg. The vapor pressure of H2O is 27 mmHg.)
what is the weight percent of oxygen in C10H16N2O6Na4
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State the difference between concrete and Portland cement.(a) There are no differences, in concrete the chemical composition is silicates and in cement aluminates.(b) The chemical composition of concrete is based on silicates and in cement aluminates.(c) Concrete is composed of aggregates bound by cement and cement "only" contains different minerals.(d) Cement is aggregates bound by concrete.
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
KINDLY WRITE IN GOOD PENMANSHIP PLEASE BECAUSE SOMETIMES I CAN'T UNDERSTAND THE WRITINGS. CHEMISTRY OF METALS IS THE TOPIC ACT G-1
The melting point of neon is significantly lower than that of nitrogen, oxygen, of fluorine. Provide a justification for this observation.
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