If you are a good investor, ________ in the stock market. [A] you can always make money [B] you can tell exactly when the stock goes up or down [C] you may sometimes lose money [D] your gambling is always safe
【简答题】化合物(A)的分子式为C 7 H 6 O 3 ,它能溶于NaOH及Na 2 CO 3 水溶液,与FeCl 3 水溶液有颜色反应,与乙酸酐作用生成C 9 H 8 O 4 ,与甲醇作用生成香料物质C 8 H 8 O 3 。C 8 H 8 O 3 硝化后可得到两种一元硝化物。试推测化合物(A)的构造式。
【简答题】What is the thermochemistry equation? why is it necessary to establish the standard state of s substance in thermodynamics? what are the standard states of a subsatance?