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What substance is present if the FeCl3 test gives a purple color? Which sample is the most impure? Unlabeled test tubes contain solid AlCl3 cdot 6H2O in one, Ba(OH)2 cdot 8H2O in another, and MgSO4 cdot 7H2O in the other. How could you find out what is in eac...
Balance the following equation and classify it as a precipitation, neutralization, or redox reaction. AgNO3(aq) + FeCl3(aq) arrow AgCl(s) + Fe(NO3)3(aq) Identify the precipitation reaction. PbSO4(s) + PbS(s) to(heat) 2Pb(s) + 2SO2(g) ...
1,3-双(4'-氨基苯氧基)苯的制备 在250mL三口烧瓶中加入无水乙醇、1,3-双(4-硝基苯氧基)苯、活性炭和FeCl3·6H2O,回流一定时间。然后在平衡滴液管中加入水合肼溶液,缓慢滴加到烧瓶中。通过薄层色谱对反应过程进行跟踪检测,待反应完全后进行热过滤和重结晶,最终得到1,3-双(4'-氨基苯氧基)苯。 应用领...
A solid state cell which can be discharged at room temperature and which has a negative Li electrode and a solid state electrolyte which conducts Li<+> ions, contains a higher-valency metal chloride such as FeCl3, MoCl5 or WCl5 to which an electron-conducting powder (Fe, Mo, W, graphite...
These agents can be divided into the following categories according to the different uses in the sludge press filtration treatment: Flocculant: sometimes called coagulant, it can be used as a means to strengthen solid-liquid separation, used in primary sedimentation tank, secondary ...
科学源于生活，少年瓦特在烧水时，发现水烧开后能将壶盖顶开因而发明了蒸汽机.水能将壶盖顶开，从分子角度分析，原因是：①水分子受热体积变大；②水分子受热能量升高；③水分子受热运动速率加快；④水分子受热间隔变大；⑤水分子受热分裂出更多分子.其中正确的是（ ）
A. 他的总效用等于价格; B. 他的边际效用等于价格; C. 他用完全部的钱; D. 这个商店售完全部的鞋。 查看完整题目与答案 已知阴离子交换膜只允许阴离子通过。某化学课外活动小组采用如下方案对印刷电路废液(溶质主要是FeCl2、CuCl2和FeCl3)进行再生:先向废液中加入过量铁粉,充分反应后过滤,再将滤液转入下图...
C, the echo-detected field swept EPR spectrum of FeCl3 was determined in the absence (blue trace) or presence (red trace) of YecA. Absorbance spectroscopy of purified YecA and YchJ During purification, the color of the YecA- and YchJ-bound Ni-NTA columns was yellow. If tris(2-...
Three ml were used to inoculate 2 Â 1 l of MOPS supplemented with 100 mg ml À 1 ampicillin and 20 mM 57FeCl3. Cells were incubated at 37 °C with agitation (200 rpm) until reaching an OD600 of about 0.5–0.6. Protein expression was then induced by adding 0.5 mM IPTG during 3...