兴趣小组为确定其组成设计并进行如下实验。 【实验一】甲组同学进行定性探究。 实验操作 实验现象 实验结论及分析 （1）取少量该未知粉末于烧杯中，加入足量的水溶解、过滤。 粉末部分溶解，得到白色滤渣和无色滤液。 原粉末中一定不含___；白色滤渣不一定是原粉末中的碳酸钙，其理由是___（用化学...
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B. Heat is always re Use Hess Law to determine the enthalpy for the following reaction: 6NO2(g) + 8NH3(g) --> 7N2(g) + 12H20(l) Calculate the enthalpy change using Hess law for CH_3COOH(aq) + NaOH(aq) \to NaCH_3COO(aq) + H_2O(l). Use Hess's law and the ...
What is the change in enthalpy for the reaction HCl + NaOH gives NaCl + H2O, in kJ/mol, calculated using Hess's Law with the given values for the enthalpy of formation of each compound (HCl, NaOH, NaCl, and H2O)? The enthalpy change, \Delta H, for a...
aStock solution 5 mL was removed hall pipette and restricted into 25 mL by 2-Methoxyethanol 8 mL and 2N NaOH 12 mL. This is used as ionization difference solution. As the reference side solution, 2-Methoxyethanol: stock solution=20:5 solutions were used.[translate] ...
aStock solution 3 mL was removed hall pipette and restricted into 25 mL by 2-Methoxyethanol 10 mL and 2N NaOH 12 mL. This is used as alkali solution. As the reference side solution of the alkaline solution, 2-Methoxyethanol: 2NaOH =13:12 solutions were used.[translate] ...
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The length/width ratio of the theca was a morphological trait related to the colonized habitats, but not the shape and size of the aperture that is often linked to moisture adaption in testate and thecate amoebae. Keywords: biogeography; environmental drivers; protists; thecate amoebae; ...
5.The poor young man is ready to accept help he can get. A.whichever B.however C.whatever D.whenever 解析:选C.句意:那位可怜的年轻人准备接受他能得到的任何帮助.whatever引导一个宾语从句.并在从句中作定语.修饰help.
It作先行主语和先行宾语的一些句型 She had said what it was necessary to say. 2. 强调句型采集者退散 It is not who rules us that is important, but how he rules us. 3. "All+抽象名词"或"抽象名词+itself" He was all gentleness to her. 4. 利用词汇重复表示