m×7×n用简便写法写成______,5×a×a可写成______.
m×7×n用简便写法写成7mn,
5×a×a可写成5a2;
故答案为:7mn,5a2.
常温下,Ksp(CaSO4)=9×l0-6,常温下CaSO4在水中的沉淀溶解平衡曲线如图.下列判断错误的是( )
A.a、c两点均可以表示常温下CaS04溶于水所形成的饱和溶液
B.a点对应的Ksp不等于c点对应的Ksp
C.b点将有沉淀生成,平衡后溶液中c(SO42-)一定等于3×l0-3mol/L
D.向d点溶液中加入适量CaCl2固体可以变到c点
—Which team do you think ________ the match?
—Hard to say. There are still ten minutes before it ends.
A.wins
B.won
C.winning
D.will win