(1)①试管;②长颈漏斗
(2)B ; 2KMnO 4== K 2MnO 4+ MnO 2 + O 2↑
(3 )CaCO 3+ 2HCl === CaCl 2+ H 2O + CO 2↑;CDE (不分先后顺序)
(4 )①5.55g ;②11.9%
(1)①试管;②长颈漏斗
(2)B ; 2KMnO 4== K 2MnO 4+ MnO 2 + O 2↑
(3 )CaCO 3+ 2HCl === CaCl 2+ H 2O + CO 2↑;CDE (不分先后顺序)
(4 )①5.55g ;②11.9%