【简答题】简述常用溶剂的极性分类以及极性排列顺序?
【单选题】— Whose skirt is this? — It the little girl's, I saw her wear it this morning. [ ]
【简答题】I saw a little girl ________(run) across the street.
【单选题】The little girl seems to ____a lot since I last saw her.
【多选题】现有浓度均为0.10mol·L -1 的醋酸V 1 mL和氢氧化钠溶液V 2 mL,下列说法正确的是
A.
常温下,上述溶液中,醋酸溶液的pH=1,氢氧化钠溶液的pH=13
B.
常温下,若两溶液混合后pH=7,则混合液:c(Na + )=c(CH 3 COO - )
C.
若 V 1 = V 2 ,将两溶液混合,所得混合液:c(CH 3 COO - )>c(Na + )>c(H + )>c(OH - )
D.
V 1 与V 2 任意比混合,所得混合液:c (Na + )+ c(H + ) =c(OH - )+ c (CH 3 COO - )
【判断题】(首都师范大学2015年)“圈儿”、“瓶儿”加在一起一共两个音节,而“儿童”、“木耳”加在一起一共四个音节。()
【简答题】On a Sunday morning, I was driving down a road and saw something I couldn’t believe. A little girl, less than two, was pushing her stroller (婴儿车) across the road. It was Sunday morning and traffic was...
【单选题】When I passed by, I saw a little girl ______ with a dog. [ ]
【单选题】将浓度为 0.10mol/L和0.20mol/L的硫酸溶液等体积混合(假设混合后溶液体积为原溶液体积的两倍),所得硫酸溶液的浓度为