2的2分之一次方怎么算

碳酸饮料是酸性还是碱性 如何抑制乳酸菌 就是让其不再生长! The compound adrenaline contains 56.79% C,6.56% H,28.37% O,and 8.28% N by mass.What is the empirical formula for adrenaline?(Type your answer using the format CO2 for CO2.) Gypsum is hydrated calcium sulfat,CaSO4·xH2O.A residue of 5.65g of anhydrous calcium sulfate is obtained by heating 7.15g gypsum.Determine the empirical formula of gypsum不用翻译……尤其是拿翻译软件翻译的……这个太。咳咳要 Haemoglobin (Hb) is the protein that transports oxygen in mammals.Hb is 0.342% Fe by mass and each Hb molecule contains four iron atoms.Calculate the molar mass of Hb. Consider the following reaction.2 HCl(aq) + Ba(OH)2(aq) BaCl2(aq) + 2 H2O(l) ΔH = -118 kJ Calculate the heat when 104.8 mL of 0.500 M HCl is mixed with 300.0 mL of 0.415 M Ba(OH)2.Assuming that the temperature of both solutions was initially 25.0°C 已知NACL是强电解质,如何用实验证明NH4CL是强电解质? NaCl可以当电解质吗说下为什么Nacl可以反应 苏打水和碳酸饮料的酸碱性?苏打水和碳酸饮料都是碳酸类饮料,为什么一个呈现碱性,而另外一个却呈现酸性呢? 韩国辣白菜发酵的时候下面有很多水什么原因? 韩国辣白菜怎么做 怎么做韩国辣白菜 地理高手进!高二地理海陆热力差异、气压带与风带的季节性移动问题海陆热力性质差异适用于哪里?气.适用于哪里? 辣白菜的发酵的微生物种类 还有家教机制 地球上 气压带风带的季节移动规律是什么为什么是一月向北移 而不能说冬季向北移呢 知道的请回答下 有关气压带、风带的季节移动!有关气压带、风带的季节移动,叙述正确的是 A.随太阳直射点移动而移动 B.就北半球来说,夏季南移,冬季北移C.地球在公转轨道上处在远日点时,全球气压带、风带 气压带风带季节性移动的问题热带沙漠气候是由副热带高气压或信风带控制的...它不是单一气压带控制么? The volume of a medium-sized grain of sand is 62 nL.If I gave you Avogadro's number of grains of sand this size and assuming that all of the sand could pack together with no empty space,which of the following is closest to the volume that would be re 人体为什么会变成酸性?如何保持弱碱性? 一道英文化学题Find the velocity of an electron emitted by a metal whose threshold frequency is 2.07×1014 when it is exposed to visible light of wavelength 5.24×10m. 一道全英文的化学题One of the species in the chemical indicator HIn􀀁 exhibits a yellow colour.If acid is added,the indicator turns red.Which of the following is correct?Red YellowA.In2-􀀁 H2InB.In2-􀀁 HIn-􀀁C. Aluminum reacts with chlorine gas to form aluminum chloride via the following reaction:2Al(s)+3Cl2(g)→2AlCl3(s)What is the maximum mass of aluminum chloride that can be formed when reacting 23.0g of aluminum with 28.0g of chlorine?Express your answ A 1.778g sample of a component of the light petroleum distillate called naphtha is found to yield5.450g CO2(g) and 2.602g H2O(l) on complete combustion.Use the masses of carbon dioxide,CO2,and water,H2O,to determine the empirical formula of the alkan 风带和气压带是怎样随季节移动的?只是说随季节变化移动.我问的是：北半球怎么移,南半球怎么移,他们是不是相反.请在回答我的问题的时候注明季节是南半球的还是北 英语翻译One-Dimensional MnII Complex Constructed From N-Donor Chelating Ligand and Organic Dicarboxylates:Hydrothermal Syntheses and Crystal Structure 如何判断有机物结构的稳定性（如烯醇卤素与羟基稳定吗）能讲一讲怎么判断吗,那能多列举几例吗 什么是风带气压带的季节移动? 怎样来判断有机化合物的绝对构型? 2道英语化学题1.How many single covalent bonds must a nitrogen atom in a neutral molecule form in order to have a complete octet in its valence shell?A)4 B)3 C)2 D)12.什么是monoprotic fluoroacetic? 两道英语题\化学题(求助)化;20世纪20年代,一些化学家提出的酸碱质子理论认为,凡能放出质子(H+)的分子或离子都是酸,凡能结合质子的分子或离子都是碱.那么,下列物质中不属于碱的是( )A.HNO3 伊利优酸乳是酸性多还是碱性多 物理变化和化学变化有什么联系?