為什麼不是E

Q搜尋 07.pdf Chapter 7: Atomic Structure and Periodicity 1. When ignited, a uranium compound burns with a green flame. The wavelength of the light given off by this flame is greater than that of A) red light B) infrared light C) radio waves D) ultraviolet light E) gamma rays ANS: D PTS: 1 DIF: Easy REF: 7.1 KEY: Chemistry | general chemistry | atomic theory light | electromagnetic radiation MSC: Conceptual 2. Which form of electromagnetic radiation has the longest wavelengths? A) gamma rays

求解答案是否正確

Multiple-choice questions: (70 points) write the letter of statement that is not true: 1. A.B.U The Drude Model: (a) It is a classical approach using concepts from the kinetic theory of gases. (b) A relaxation-time approximation is used where the probability of collision is l/t. (c) No forces act on the electrons in between collisions. (d) It predicts accurately the electronic heat capacity of metals. 2. The Sommerfeld Model: (a) The crystal potential is replaced by an average Coulomb potential. (b) The separation of states is so close that a continuum model can be applied. (c) The electrons are highly localized due to a strong crystal potential. (Q) The energy of the highest occupied state at 0 K is the Fermi energy. 3. Density of states in k-space, N(k): (a) N(k) is determined by the boundary value conditions. (b) For lattices in any dimensions, N(k) is constant in k-space. (C) N(k) depends on the direction and magnitude of k. (d) It is directly proportional to the volume of the crystal. E影響, c 4. The Fermi surface of a metal: (a) is responsible for many of the transport properties of the metal, (b) depends on the nature of the chemical bonds, (c) is always a sphere, (d) can involve mixing of electron orbitals. ✓ 5. The conductivity of a material () increases with the mobility of its carriers, (b) increases with the density of carriers, (C) it is inversely proportional to the energy gap. cogu changes with temperature. 6. BID Plasmons: (a) They are an important characteristic of the Sommerfeld electron gas model. (b) Plasmons occur spontaneously in metals. (c) They are related to charge density oscillations. (d) The Plasmon energy is typically of the order of 10 eV. The Fermi energy Ef in intrinsic semiconductors 8) is usually close to y E, at OK (b) it ACiD. can increase or decrease with temperature depending on the ratio of hole and electron effective masses, (c) it represents the point at which the probability of occupation is 12, even though there may not been any states with that energy, (d) its value relative to the electronic bands must remain unaffected in the presence of defects or interfaces.

有沒有大神能就救這幾題，快崩潰了嗚嗚

5. How could you prepare cyclohexane starting from 3-bromocyclohexene? (7-53) (4 points) 6. Propose a mechanism for the following reaction. (Chapter 7, slide 10) (6 points) MeOH OCH3 ť + heat OCH3 7. Propose a mechanism for the following reaction. (8-59) (5 points) OH CF3CO2H Y + 8. Identify the reagents a through d in the following scheme. (8-61) (8 points) OH OH a b d H OH

13.求解🙏🙏🙏

Na d. lowest freezing point: N2, CO, or CO2 102 +02 13. When 2.00 moles of SO2(g) reacts completely with 1.00 mole of O2(g) to form 2.00 moles of SO3(g) at 25°C and a constant pressure of 1.00 atm, 198 kJ of energy is released as heat. Calculate AH and AE for this process.com 14. Prediction of molecular structure PC1s. ce ce #batum 15. Calculate AH for the synthesis of diborane (B2H6) from its elements, according to the equation

為什麼答案是B

Page Ref 11.3

普物-請問第41題

41。The surface of the continental United States has an area of about 8x 106 km2 and an average elevation of about 500 m (above sealevel. The average yearly rainfallis 75S cm.The frac- tion ofthis rainwaterthatreturns tothe atmosphere by evapora- tion is生the rest eventually flows into the ocean. Ifthe deerease in gravitational potential energy of the water-Earth_ system associated with that flow could be fully converted to eleetrieal energy, what would be the average power? (The massoflm'of water is 1000 kg.) 人 loon reaches its maximum height? potential energy is taken to be Zere its value atthe launch point) (D W 48 Avoleanicash ttowismovint eneountersa8.0” upslope.The ff up the slope before stopbing. As the flow Ift the flow and thus ground negligible: assume als the front ot the flow is conserve

請問這題氧化還原怎麼算

wt 26.75 mL ofthe KMnO, solution (0.02966M). Caleulate the percentage ofFezOy (Fe=55.8 家提交 | GO 2 0.0090 SOre Sample was reduced quantitatively to the +2 state and then titrated | g/mo1 jm 了he sample. | (A) 95.12% (B) 47.56% (C) 43.12% (D) 38.04% (E) 19.02% 高峰93(60 7

41.c 答案為4*10＾（-7） 可是此題的有效數字不是應該為兩位嗎？ 求解 感恩🙏

ma史 40.。 Perf 1 | am 記 following mathematical] Operatlons, and expDresSS Tesult to the correct number of s1lgnlficant filgures. @@ 036.089o 2 1.01 DOCX OIO22 2 0 0 XX 50021x 103 X 7.3904X 102 2.00 xX 106 SO ad, 41.。 Perform the following mathematlcal operatlonS, and express the result to the correctnumber of signlflcant filgures. 2.626 祝 0.470 80.705 3隆 0.623 0.4326 b. (6.404 x 2.91)/(18.7 一 17.1) CC eduamaaese2ecero0一9521ye+94 (SO 0記 CC_IO 0 1 fa (Assume that this operation is taking the average of tfour numbers.Thus 4 in the denomlnator 1S eXact.) 人 ao,

求此題解法

\ 全閃作食 似合公所 全 TETTTEDEUUH 光 (人 夷浴汪淋浴弦潑地夫《慘 sg 說 /全全 台7夫吉戰潑玉卻瑟旨 3 和 說 記 選下 Fe0o90O1i.06. What percentage of 急 「 The compositon ofa sample of iro | 她Sirgn is in the form ofiron(丁)? (59% 【101 台大5Bj | Bo 全 丈夫 《馮 區嗇參 22.22 7) WUyiOG@ 33 會

只有氧是不規則的命名嗎？ Tetroxide vs tetraoxide Pentoxide vs pentaoxide PCl5 後面Cl 就是 pentachloride

6 机 BLE 2.6 | Prefixes Used to Indicate Number im Chemical Names U選4 7)o7o- g- 7二 Numberindicated 1 7efrg- 2e77o- Agexog- 7epfg- Ocfg- 7o7g- 選和os和 eu |,, decg- INTERACTIVE EXAMPLE 2.8 SOLUTION JPHABnEB 呈_Atomsg, Miolecules, and Ins consider the names ot the s will no To see how these Tules apply, 沿 同 lent compounds formed by nitrfgg 時 as tematic Name 了 同 loxi Nitrous oX1ce de 。 imitrogen InonoX1 1 9 ii monoxide NI 時 4 NO Nitrogen N os Dinitrogen TioX1 同 Noo, Dinitrogen tetIOX1 Noo Dinitrogen pentoxi 2 avoid awkward pron that to hen the element beglns Wtt 7oO/ dinitrogen tetrdox ng examples fthe prefiX trogen tetroxide, tt their common names- esystematic names to Notice from the precedi often drop the final ? % 20 example, N204 1S called dinlt called carbon monoxide, 7 carbo Some compounds are always Te are water, ammonia, and hydrogen pe H2O2 are never used. n monoox1l ferred to by roxide- Th Naming Type 山 Binary Compounds 1. Name each of the following compounds: a. ,PCD DBGIG MS 09 2. From the following systematic nameS, Write the formula for ea a.。 Sulfur hexafluoride b. Sulfur trioxide c.。 Carbon dioxide 1 Formula Name a. PCl Phosphorus pentdehloride Be Phosphorus trichloride c. SO2 Sulfur dioxide 2. Name Formula a.。 Sulfur hexafluoride SFe b.。 Sulfur trioxide SO ce. Carbon dioxide CO