自然科學 大學 約1個月以前 請問一下大家像這類型的題目該怎麼把得到的數字轉換成H+ 11.計算以下各溶液的[H+],並指出溶液是酸性或鹼性。 * H30KW解離常教[M307CMJ=1.0x107 a. [OH] = 2.32 x 10-4 M b. [OH] = 8.99 x 10-10 M C. [OH] = 4.34 x 10-6 M d. [OH] = 6.22 x 10-12 M 已解決 回答數: 1
自然科學 大學 約1個月以前 希望有人可以解救一下 關於壓縮功率的問題 第二題求得出 但第一部分怎麼算都算不出來… 20:44 目。 1 2 練習題 注意 3. 填空題(50分) 中 一個使用R-134a作為冷媒的家用冰箱,該冰箱冷媒的進入蒸發器的比焓為165 kJ/kg,進入壓縮機的比焓為 295 kJ/kg,進入 冷凝器的比焓為 330 kJ/kg。系統的制冷負荷為400W。 1. 請計算該壓縮機的功率。1 2.請計算該冰箱的性能係數(C.O.P.)。 2 1 4.67 2 3.71 答題情況 待回答 回答數: 0
自然科學 大學 8個月以前 這題很難理解 Potential energy (MeV) a. 3 fm. b. 4 fm. 1 2 3 FIGURE 7.24 Potential energy for two deuterons (Passage Problems 70-73) (MeV), a unit commonly used in nuclear physics, and the separation is 10-¹5 m). c. -3 MeV. d. 0.3 MeV. 5 in femtometers (1 fm 劉 70 The force between the deuterons is zero at approximately 10 Separation (fm) c. 3.3 MeV. d. 3.6 MeV. = c. 5 fm. d. the force is never zero. 71. In order for initially two widely separated deuterons to get close enough to fuse, their kinetic energy must be about a. 0.1 MeV. b. 3 MeV. 72. The energy available in fusion is the energy difference between that of widely separated deuterons and the bound deutrons after they've "fallen" into the deep potential well shown in the figure. That energy is about a. 0.3 MeV. b. 1 MeV. 73 When two deuterons are 4 fm apart, the force acting on them a. is repulsive. b. is attractive. c. is zero. d. can't be determined from the graph. 待回答 回答數: 0
自然科學 大學 約1年以前 這幾題有人會嗎? 8. (14 points) Write down the Slater determinants (or linear combination of Slater determinants) for (a) (8 points) the He atom at the lowest excited state in accord with Hund's rule with Ms = 0. (b) (6 points) the Li atom in its ground state with Ms = -1/2. 9. (24 points) For a two electron system, (a) give all the electronic spin functions for the triplet state and the singlet state; and (b) draw plots to show the orientations and the magnitude of the spin vector S1, S2, and S (S = S1+S2) for both spin states of S= 1, Ms = 0 and S = 0, Ms = 0. 10. (12 points) For a hydrogen-like atom, give the results for the following operation on the spin-orbital function: (a) L²(3d¹ß); (b) Lz(2p₂a); (c) S²(2sa); (d) $₂(3poß) 尚未解決 回答數: 0
自然科學 大學 約1年以前 有人會這題的嗎? (12 points) Find the possible term symbols for the following electronic configurations (spin-orbit interaction is not necessary included) (a) (1s)¹(2p)¹ (b) (1s)²(2p)¹'(3p)¹ (c) (1s)²(2s)² (2p) (3s)² (3p)³ 尚未解決 回答數: 0
自然科學 大學 約1年以前 想要請問反應式(畫螢光筆)是如何假設 範例 12 12:BT 10容器內在 27℃時,充入 10atm NH密閉,使其在催化劑存在下加熱至 327℃,容器內壓力爲 30atm,則NH之分解百分率爲 (A)20 (B)30 (C)40 (D)50。 【68 私醫】 P 解:(D) (1) 假設原有NH, a mole,當依下式分解後,容器內的總莫耳數變成 N 已解決 回答數: 1
自然科學 大學 1年以上以前 求問這題怎麼解 練演2-3.將10克的銅片放入硝酸銀溶液中,等銅片表面附有一層金屬銀後取出, 洗淨、乾燥,然後稱得其重量為 12 克,則在銅片上析出的銀重量約為多少克? (原子量:Ag=108,Cu=63.5) (A)7.6 (B)4.8 (C)2.8 (D) 6.4。 尚未解決 回答數: 1
自然科學 大學 1年以上以前 想請問這題🙏,有點看不懂圖三的公式是從何而來,卡住了 EXAMPLE 21.11 FIELD OF A UNIFORMLY CHARGED DISK A nonconducting disk of radius R has a uniform positive surface charge density o. Find the electric field at a point along the axis of the disk a distance x from its center. Assume that x is positive. SOLUTION IDENTIFY and SET UP: Figure 21.25 shows the situation. We rep- resent the charge distribution as a collection of concentric rings of charge dQ. In Example 21.9 we obtained Eq. (21.8) for the field on the axis of a single uniformly charged ring, so all we need do here is integrate the contributions of our rings. EXECUTE: A typical ring has charge dQ, inner radius r, and outer radius r + dr. Its area is approximately equal to its width dr times its circumference 2πr, or dA = 2πr dr. The charge per unit area is σ = dQ/dA, so the charge of the ring is do = o da = 2πor dr. We use dQ in place of Q in Eq. (21.8), the expression for the field due to a ring that we found in Example 21.9, and replace the ring 21.25 Our sketch for this problem. Idr dQ X P dEx dEx radius a with r. Then the field component dEx at point P due to this ring is 1 2πσrx dr 4π€0 (x² + ²)3/2 SOLUTION Continued 尚未解決 回答數: 1
自然科學 大學 1年以上以前 求解,拜託🙏🏻 氯酸鉀(KCO3)加熱分解出KCI與O2 (1) 當取0.8 mol的KCIO,可產生O2多少mol? (2) 標準狀態下,產生3.36 L的O2,同時有多少克的KCI生成? 2KClO3 → 2KCl + 3O2 (9) 標準狀態 : 0°C, 1 atm ■ MW: KCl3 (122.5), KCI (74.5), O₂ (32) 待回答 回答數: 0
自然科學 大學 1年以上以前 為什麼此題答案為D -8 範例7 設氯有二種同位素,分別爲C1,C1,且已知在自然界中,Cl佔 75 %, 37 Cl佔 25 %,試回答下列各問題: (1)在質譜儀中,Cl+2,Cl+,C咕離子可產生幾條譜線? (A)1條(B)3 條(C)5條(D)7 條(E)9 條。 尚未解決 回答數: 1