化學 PH值計算（多質子酸解離） 請問這題錯在哪裡呢😭

0.3M Na2HPO4 Example #1: Determine the pH of 0.300 M sodium hydrogen phosphate, Na₂HPO4. Phosphoric acid, H3PO4, contains K₁₁ = 7.5 x 10-3, K₂ = 6.2 x 10-8 and K₁3 = 4.2 x 10-13. al a2 a3 x² 0.2x=4.2X10-13 x² = 1.26×10-¹3/- 0.₁126×10/2 x = 0.355x100 HP04² = H30t+ P04² 0.3 0.3-X +x +X X X 3- 04-beg[+0]- (6.459.78 PH= Simp -6

想請問這兩題怎麼解？觀念是什麼？

8. 一圓之外切等腰梯形ABCD 的上底AD=2,下底BC=6,則 (1) AC BD = - (2) 若 AC = x AB+yAD,x,y為實數,則x= 答:(1) 4 太 (2) x=1,y=3 D. 外切等腰梯形: AD+C = AB + CD h 2 92+6=2(AB),AB=4. , y=_ mx 4096180-1 rose.

請問這題要怎麼算呢？是要畫圖理解嗎..？

6. 坐標平面上,有一邊長為2的正六邊形 PABCDE實心木板,其中兩頂點 P(0,0)與 A(2,0),將此木板放在xy平面上且沿x軸正向滾動,過程中只看頂點 P(x,y)移動 的軌跡,當P的坐標為(12,0)時,求P點的軌跡所在曲線與x軸所圍成封閉區域的 面積為 METS (1) 4z +6√3 (2)6元 (3) 6π+6√3 (4) 8元 (5)87+6√3. E (010) y P B (210) B x

求解

Chrome 檔案 Sylves Scores M Gmail ▸YouTube | 地圖 Pearson eText Purchase Options Study Area User Settings Course Home Ghe binding energy of a two-par X + openvellum.ecollege.com/course.html?courseld=17667848&OpenVellumHMAC=9c8d5dd7baa0c70ec3a75db4e52f2d39#10001 Document Sharing Course Tools 檢視 歷史記錄 書籤 設定檔 分頁 視窗 說明 單 > 翻譯 The position of a 280 g object is given (in meters) by x = 5.1 t³ - 8.0 t²-44 t, where t is in seconds. https://session.masteringphysics.com/myct/itemView?assignment ProblemID=176946106 10月 13 Part A tv Determine the net rate of work done on this object at t = 2.0s. Express your answer using two significant figures. Pt 2.0s= = Submit Part B VAΣO Pt=4.18= = Request Answer Determine the net rate of work done on this object at t = 4.1s. Express your answer using two significant figures. VAE P Pearson ? 1999+ ? W Caright © 2022 Pearson Education Inc. All rights reserved. Terms of Use | Privacy Policy. Permissions Contact Us | W G3 ✩ 10月13日 週四 上午 12:38 I Constants 更新

求解

Chrome 檔案 M Gmail 3 My Courses Course Home Syllabus Scores YouTube Pearson eText Study Area Purchase Options User Settings Course Home X Ghe binding energy of a two-par x + openvellum.ecollege.com/course.html?courseld=17667848&OpenVellumHMAC-9c8d5dd7baa0c70ec3a75db4e52f2d39#10001 Document Sharing Course Tools 單 檢視 歷史記錄 書籤 設定檔 分頁 視窗 說明 地圖 > 翻譯 <L.8 Problem 8.51 Part A W = Submit VAE Provide Feedback How much work would be required to move a satellite of mass m from a circular orbit of radius r₁= 2re about the Earth to another circular orbit of radius r2 = 3rE? (rE is the radius of the Earth.) Express your answer in terms of the variable m and constants rE, ME, and G. Request Answer https://session.masteringphysics.com/myct/itemView?assignment ProblemID=176946298 10月 13 tv ? 10月13日 週四 上午12:37 - 999+ ■ 8 of 10 更新: Constants Next >

求解

Chrome 檔案 M Gmail 3 My Courses Course Home Syllabus Scores YouTube Pearson eText Study Area Purchase Options Course Home User Settings Document Sharing Course Tools 單 openvellum.ecollege.com/course.html?courseld=17667848&OpenVellumHMAC=9c8d5dd7baa0c70ec3a75db4e52f2d39#10001 檢視 歷史記錄 書籤 設定檔 分頁 視窗 說明 地圖 > 翻譯 X Ghe binding energy of a two-par x + <L.8 Problem 8.99 A satellite is in an elliptic orbit around the Earth. Its speed at the perigee A is 8526 m/s (Figure 1). Figure 16,460 km B 8230 km 8230 km 10月 13 A 1 of 1 14.255 km tv UB = Use conservation of energy to determine its speed at B. The radius of the Earth is 6380 km. Express your answer in meters per second. Submit Part B VC = VAΣ Submit Request Answer Use conservation of energy to determine the speed at the apogee C. Express your answer in meters per second. VAE Request Answer ? 1999+ m/s ? G m/s 10月13日 週四 上午12:37 ■ 10 of 10 Constants 更新

求救

Chrome 檔案 M Gmail Course Home Syllabus Scores YouTube Pearson eText Study Area Purchase Options Course Home User Settings Document Sharing Course Tools 單 openvellum.ecollege.com/course.html?courseld=17667848&OpenVellumHMAC=9c8d5dd7baa0c70ec3a75db4e52f2d39# 10001 檢視 歷史記錄 書籤 設定檔 分頁 視窗 說明 地圖 > 翻譯 X Ghe binding energy of a two-par x + <L.8 Problem 8.75 The binding energy of a two-particle system is defined as the energy required to separate the two particles from their state of lowest energy to r= ∞o. The potential energy of the two atoms in a diatomic (two-atom) molecule can be written b U(r) = − 6 +12, where r is the distance between the two atoms and a and b are positive constants. 10月 13 Part A Determine the binding energy for this molecule. Express your answer in terms of the variables a and b. Ebind= Submit Provide Feedback VAEO tv JA xa Xb b √x x x X Incorrect; Try Again; 3 attempts remaining Previous Answers Request Answer 1999+ C |X| ? X.10n 10月13日 週四 上午12:33 I 9 of 10 Constants 更新 Next >

求詳解🙏

合 8. 已知以每秒 0 公尺的初速度將物體鉛直上拋,t秒後的高度為y公尺,會符合公 以 12. 式y=vot-4.9t² 棒球練習場有一投球機以 34.3 公尺/秒的初速度將棒球垂直往 。 上發射,試問棒球高度不小於49公尺的時間有幾秒?6 答 (0.8) (0) (0 (D. E-) 10

請問有人會這三題嗎

= 1x 10⁰ p -45. Perform the following unit conversions. meme a. Congratulations! You and your spouse are the proud parents of a new baby, born while you are studying in a country that uses the metric system. The nurse has gibre informed you that the baby weighs 3.91 kg and measures 51.4 cm. Convert your baby's weight to pounds and to ou ounces and her length to inches (rounded to the nearest 3.91 quarter inch). 4536 =8 9.9102 10 20. 2 in, 2b. The circumference of the earth is 25,000 mi at the equa- tor. What is the circumference in kilometers? in meters? 三 c.) A rectangular solid measures 1.0 m by 5.6 cm by 2.1 dm. Express its volume in cubic meters, liters, cubic inches, and cubic feet.

請問第87和90題🙏

AC pd AS (C) highest melting point of any metal (D) metal's highest melting point of any 87. Biochemists use fireflies to study bioluminescence, (A) the heatless light given off by certain plants and animals (B) certain plants and animals give off the heatless light (C) which certain plants and animals give off the heatless light (D) is the heatless light given off by certain plants and animals 88. Canada has two official languages, (A) they are French and English (B) French and English (C) which they are French and English (D) French and English they are a shock wave caused by a convulsion deep in the ground. 89. An earthquake (A) is (B) that is (C) as (D) although 90. Kenyon Cox, an art critic and painter, best known for his murals, portraits, and decorative designs in public buildings throughout the United States. (A) who is (B) he is (C) is (D) and he is