自然科學 大學 6個月以前 2. Eric uses a computer software to simulate a 20-residue peptide in different structures. Structure A is an a-helix structure; structure... 繼續閱讀 尚未解決 回答數: 0
自然科學 大學 7個月以前 這題有人會嗎?嘿嘿 4. Arrange the enthalpy of when the following compounds react with BF3; also explain the reason in detail. (5 pts) tBu N tBu N 尚未解決 回答數: 0
自然科學 大學 7個月以前 有人會這題嗎⋯⋯🙇🏻♀️ 17. What is the relationship between the following pair a structures? H₂C CH₂ CH₂ X H a. They are enantiomers b. They are diastereomers c. The are constitutional isomers d. They are identical 待回答 回答數: 0
自然科學 大學 8個月以前 求問這題的c小題 4. A solid mixture of Na2SO4 and K2SO4. A 0.205 g of sample of the mixture is dissolved in water. A excess of an aqueous solution of BaC12 is added. The BaSO4 is formed is 0.289 g. a. What mass of SO4-2 ion is in the sample? b. What is the mass percent of SO4-2 ion in the sample? c. What are the percent compositions by mass of Na2SO4 and K2SO4 the sample? a. 0.123 g of SO4-2 ion b. 60% of SO4-2 ion c. the mixture is 61% K2SO4 and 39% Na2SO4 待回答 回答數: 0
自然科學 大學 8個月以前 答案如圖 9.47 A frictionless pulley has the shape of a uniform solid disk of mass 2.90 kg and radius 10.0 cm. A 1.60 kg stone is attached to a very light wire that is wrapped around the rim of the pulley (Fig. E9.47), and the system is released from rest. (a) How far must the stone fall so that the pulley has 3.30 J of kinetic energy? (b) What percent of the total kinetic energy does the pulley have? 01442m 47.6% Figure E9.47 T M mg 10 A 116 1.50 kg stone 2.9 2.50 kg pulley 待回答 回答數: 0
自然科學 大學 8個月以前 答案如圖 9.47 A frictionless pulley has the shape of a uniform solid disk of mass 2.90 kg and radius 10.0 cm. A 1.60 kg stone is attached to a very light wire that is wrapped around the rim of the pulley (Fig. E9.47), and the system is released from rest. (a) How far must the stone fall so that the pulley has 3.30 J of kinetic energy? (b) What percent of the total kinetic energy does the pulley have? 01442m 47.6% Figure E9.47 T M mg 10 A 116 1.50 kg stone 2.9 2.50 kg pulley 待回答 回答數: 0
自然科學 大學 約1年以前 想知道答案D的更詳細解釋🙏 75. 11 (Nej 25 Na²O² is less stable than [Na₂ ] 0². This lesser stability is due to (A)the very small size of the Na²+ ion (B)the large size of the O²- ion relative to Na²+ (C) the instability of oxide ions in the presence of 2+ ions W (D)more energy is required to ionize sodium than would be realized in the attraction between Na²+ and 0²- (Ethe statement is false, both materials are stable. 【87 成大】 尚未解決 回答數: 1
自然科學 大學 約1年以前 想請問A選項 4. 有關角度大小何者錯誤? X-M ANHẤNF (B)HO*>H,O (C)NH>BE, (D)NH:>NH, (E) ✓ 12 2 SO₂>SO>SO¹>SO ²0 JES=O 3 已解決 回答數: 1
自然科學 大學 約1年以前 這個是要用共軛複數的方式去解嗎? P.11 For a Hermetian operator Â, f¥(x)[Â¥(x)] dx f(x)[Au(x)]*dx. Assume that  f(x) = (a + ib) f(x) where a and b are constants. Show that if  is a Hermetian operator, b = 0 so that the eigenvalues of f(x) are real. 尚未解決 回答數: 1
自然科學 大學 約1年以前 題目看不懂問什麼及請問答案 2. Draw an alkane with the molecular formula C5H₁0 for each of the following criteria: (a) could exist in either cis or trans isomers, (b) could not exist in either cis or trans isomers (c) contains only secondary carbons. 待回答 回答數: 0