自然科學 大學 3個月以前 這兩題該怎麼寫 5. Suppose that a reaction C2H6C2H4+H2 is believed to occur by the mechanism: 1. C2H6-2CH3 2. CH3+ C2H6 CH4+ C2H5 ->> 3. C2H5 C2H4+H 4. C2H6+H→C2H5+H2 5. 2 C2H5 C4H10 . Apply the steady-state treatment to C2H5 CH3 Hand obtain an expression for the overall rate. 6. The reaction between chlorine and chloroform in the gas phase follows the stoichiometric equation CHC13 C12 CCl4 + HCl It is believed to occur by the mechanism Cl₂+hv 2C1 Cl+CHCl3 HCl + CC13 CC13 C12 CCl4 + Cl 2C1→Cl₂ Assume that the steady-state treatment can be applied to C1,CC13 and obtain an expression for the overall rate. 待回答 回答數: 0
自然 國中 3個月以前 求解謝謝(希望有人能詳細解釋這10題~ 麻煩了😊 (1)僅按下時,電路中哪些燈泡會發亮?圏 二、題組 1. 春明做電學實驗時,設計的電路如圖所示。假設電路中導線的電阻 為零,且L、L2、L、L為燈泡,K、K、K、K為開關,試 回答下列問題: 〖93.基測〗 K2 K3 24 (3)僅按下K時,電路中哪些燈泡會發亮?圏: (2)僅按下K時,電路中哪些燈泡會發亮?圏: L L4 K₁ 。 V Li 24 (4)同時按下K、K時,電路中哪些燈泡會發亮?圏: 全不亮 (5)同時按下K、K時,電路中哪些燈泡會發亮?圏: L2.23.24.4 (6)同時按下K、K、K時,電路中哪些燈泡會發亮?圏: (7)同時按下K、K、K時,電路中哪些燈泡會發亮?圏: L2 L32420 (8)同時按下K、K、K、K時,電路中哪些燈泡會發亮?: 24全不亮 (9)若春明不按任何開關時,電路中哪些燈泡會發亮?圏: 00若春明想要燈泡全亮,則需按下哪些開關?圏: K2 K30 。 尚未解決 回答數: 1
數學 高中 4個月以前 求這題詳解 2x9 3+19+16 4 2 -3 3X1 • (x+3)-12 (x+3)+) 7 13.如下為T:y=x3+9x2+15x和L:y=x+29的圖形,兩者交於三個點,將L往下平 01-0--4-0-7 -2-h xxx 土 移k單位,得到線,使得L和T交於相異三點A,B和C,且AB=BC,則k=ANA "y=2x+29 y=-28+7 = 1 3x-4 -2 32 ¥2x+1/3+2x²-48+7 ¥2x+1 50. 25=2a+b y=ax+b 3X²+6x²-4X -4x²-4x+7 -4x² 2=-9 A 0.9.1.4. 給你 1分鐘 -2=9 21210 At t 28-61 -50 50 3-4+2+8/16 24=3p 27+3p+1. 8 "P x+3)² + P(x+3)+1 混合題 題目在下頁→ -10jclo alhpix-hitk 4 3)3+ P(x+3)+1 y=a(x-h)+k (1) y=4(x-1)--8 _16-8=8 27+(-5)=22 Q x=-12 yeaxtb 3x2 1+(-2)+7+ -1256 -4-9(x-1)-8 2(x²-4入+2²)+ 244 L44 2 12 -6 12,27) 2+6 - 10 -18 24 -8/25 發送訊息…………… O O ||| 尚未解決 回答數: 1
數學 國中 6個月以前 求解!問這題怎麼算? 41. 如圖,已知L1、L2、L3、L4 皆為直線,L // L2 // L3 // L4,直線M與M2為截線,且 AE:BF:CG:DH=3:5:8:13,若 尚未解決 回答數: 1
數學 高中 11個月以前 求兩題 謝謝~ 4 必考題型 10 11. 槍彈雖有其合法用途,但也常淪為犯罪工具,嚴重危害社會治安。我國嚴格管制 槍彈,違者需要接受法律制裁,因此槍彈鑑識是維護司法正義的堅實後盾。 A 李探長為找尋槍手的可能發射位置,他設定一空間坐標,先從點(0,0,2) 朝向點(10,164) 發射一固定雷射光束,接著又從點(0,8,a)沿平行於x軸 方向發射另一雷射光束。 (1)當a為何值時,兩雷射光束會相交? <答案>:1.(1)3;(2)(5,8,3) (2)求兩光束交點坐標。 48,0 待回答 回答數: 0
自然 國中 11個月以前 有人會嗎 29% (B)甲:脂質,乙:肝臟 (0) 甲:蛋白質,乙:腎臟 (D)甲:蛋白質,乙:肝臟 39.鎂離子為海水中含量第二多的金屬離子,從海水中提取鎂離子為工業上製造鎂的 方法之一。其步驟如下: 2+ 步驟一:在濃縮的海水中加入氫氧化鈉,會產生氫氧化鎂而沉澱析出。 Mg²+ + 2NaOH→2Na++Mg(OH)z 步驟二:之後再加入鹽酸,經處理後可得到固態的氯化鎂。 Mg(OH)2 + 2HCl → MgCl + 2H2O 潛水 小 情形 向海 水白的 而食 潛 步驟三:電解熔融狀態的氯化鎂即可得到鎂。 電解 MgClh → Mg + Cl2 2929x0.8 b 依據上述方法,在某次製鎂的反應後,共產生鎂960公克,則該次製鎂反應中, 理論上會消耗重量百分濃度為80%的鹽酸共多少公克?(鎂的原子量為24,氯 化氫的分子量為36.5) (A) 1825 89 MgClio Mg+42 My cho Meta (B) 2400 2764×194 24 (C)2920 -2698 √x 4 49 9609 (D) 3650 24 = 4and 4 Mygli foltcle 40 Mg C12 +88120 1450 8083665 Mg(OH)2+2HCl4 960 18 自然 尚未解決 回答數: 1
化學 高中 約1年以前 想問這題 18. ...? 9. 下列哪些分子在形成鍵結時,須先提陞部分價電子,再經過軌域的混成? (A)SiCl4 (B)BF3 (C)H₂O (D)BeCl2 (E)NH3 尚未解決 回答數: 1
自然科學 大學 1年以上以前 為什麼[A(org)]=n[An(org)]成立 (第三張圖equation 7.9) 感謝 Experiment 7 Experiment 7 The partition of Organic acid between Water and Organic solvent Objectives Understand the partition of a solute between two immiscible solvents. Introduction A chemical analysis that is performed primarily with the aid of volumetric glassware (e.g., pipets, burets, volumetric flasks) is called a volumetric analysis. For a volumetric analysis procedure, a known quantity or a carefully measured amount of one substance reacts with a to-be-determined amount of another substance with the reaction occurring in aqueous solution. The volumes of all solutions are carefully measured with volumetric glassware. The known amount of the substance for an analysis is generally measured and available in two ways: 1. As a primary standard: An accurate mass (and thus, moles) of a solid substance is measured on a balance, dissolved in water, and then reacted with the substance being analyzed. 2. As a standard solution: A measured number of moles of substance is present in a measured volume of solution - a solution of known concentration, generally expressed as the molar concentration (or molarity) of the substance. A measured volume of the standard solution then reacts with the substance being analyzed. The reaction of the known substance with the substance to be analyzed, occurring in aqueous solution, is generally conducted by a titration procedure. The titration procedure required a buret to dispense a liquid, called the titrant, into a flask containing the analyte. A reaction is complete when stoichiometric amounts of the reacting substances are combined. In a titration this is the stoichiometric point. In this experiment the stoichiometric point for the acid-base titration is detected using a phenolphthalein indicator. Phenolphthalein is colorless in an acidic solution but pink in a basic solution. The point in the titration at which the phenolphthalein changes color is called the endpoint of the indicator. Indicators are selected so that the stoichiometric point in the titration coincides (at approximately the same pH) with the endpoint of the indicator. 待回答 回答數: 0