【单选题】Tom, turn down the music. Why _____ you make such a big noise while your baby sister is sleeping? [ ]
【单选题】Why does Jane refuse Tom's invitation?
A.
Because she wants to study for a test.
B.
Because she wants to go swimming at the student center.
C.
Because she has to do research in the library.
D.
Because she is not interested in the man.
【单选题】--- Why? Tom, your shirt is so dirty! --- Mum, I ______ my storeroom downstairs.
【单选题】1mol/L HAc 溶液中 HAc 的 α = 1.33% , 则 [H + ] 为: ( ) mol/l.
【单选题】Why,Tom, didn't you get your bike ? [ ]
【单选题】在 50mL0.1 mol ·L -1 HAc溶液中加入等体积水稀释,对稀释后的水溶液而言,下列叙述正确的是 A B C D
A.
HAc 的解离度 α 减小,溶液的 pH 值减小
B.
HAc 的解离度 α 增大,溶液的 pH 值增大
C.
HAc 的解离度 α 增大,溶液的 pH 值减小
D.
HAc 的解离度 α 增大, HAc 的解离常数增大
【单选题】1mol·L -1 HAc,α HAc =1.33%,则在此溶液中微粒浓度最大的是
【单选题】Tom, turn down the music. Why ____ you make such a big noise while your baby sister is sleeping? [ ]
【单选题】1mol/lHAc 溶液中 HAc 的 α = 1.33%, 则 [H+] 为( ) mol/l.