25. Which of the following theory models can explain that there are two lone pairs in a water molecule?
(A) Hard and Soft Acids and Bases
(B) Lewis structure model
(C) molecular orbital
(D) Le Chatelier's principle

(E) Ligand field theory

26. In a group meeting, you are asked a question that you do not know how to answer. What would you do?(A) Talk your way out through bad chemicals.(B) Be silent and wait until the meeting ends(C) Change the subject(D) Blame the instrument(E) Admit that you do not know, explain how you would verify it or what additional experiments you would do, and report back next time with a careful data analysis.

27. As a new graduate student, you are about to begin a research project. Which of the following practices should you follow to get started?(甲) Search and read the literature for one time(乙) Keep searching and reading the literature all the time(丙) The results and theory from the literature are always correct. I should not argue with them.(丁) Always questioning the results published in scientific papers and in the literature(戊) Before starting any experiment, form a logical expectation (hypothesis) for the outcome.(A) 甲丁(B) 乙丁戊(C) 乙丁(D) 丙戊(E) None of the above

28. If a reaction suddenly cannot be repeated under your operation, what is your first step?(A) Do other reactions or experiments, so my Professor will forget to ask me about it later(B) Report to my professor, and he/she will tell me what to do next.(C) Make a variable checklist (e.g., temperature, concentrations, solvent, reagent purity, atmosphere, stirring, equipment, and batch-to-batch differences), and then carefully check all the variables one after one until knowing what the problem is.(D) Increase the temperature first to see whether it improves.(E) None of the above

29. Which of the following statements regarding zeolite materials is incorrect?(A) mainly octahedral frameworks(B) mainly tetrahedral frameworks(C) doping transition metals in the framework is possible(D) selective catalysts for industry(E) All of the above

30. What information is not provided by XPS (X-ray Photoelectron Spectroscopy) data?(A) oxidation states(B) binding energy(C) chemical environments(D) crystallinity(E) All of the above

1. In the editorial, the columnist launched a fierce ___ against corporate greed, criticizing executives with sharp language and uncompromising arguments. (A) anecdote (B) polemic (C) rivalry (D) tenacity

2. The professor's lecture on quantum mechanics was so ___ that only advanced researchers could fully grasp its complex theoretical implications. (A) accessible (B) candid (C) esoteric (D) impervious

3. Her ___ attention to detail ensured that every report was flawless, with no errors overlooked, no matter how minor. (A) churlish (B) condensed (C) fastidious (D) negligent

4. Although the chemical sounded dangerous, it was actually ___ in small quantities and posed no threat to human health. (A) caustic (B) innocuous (C) scrupulous (D) vigilant

5. She accepted the challenging task with ___, demonstrating enthusiasm and a cheerful willingness to begin immediately without hesitation. (A) aversion (B) apathy (C) amnesty (D) alacrity

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