A:Al2(SO4)3=2Al3++3SO42−
B:Ca(NO3)2=Ca2++2(NO3)2−
C:Ba(OH)2=Ba2++OH2−
D:Na2CO3=Na2++CO32−
①do____ ②watch____ ③clean____
④read ____ ⑤write ____ ⑥play____
⑦swim____ ⑧shop ____ ⑨study____
化学就在我们身边,下列叙述不是化学变化的是( )
—What does your Chinese teacher look like?
—She of medium height.And she short hair.