(1)①长颈漏斗 ②集气瓶
(2)2KMnO 4 K 2MnO 4+MnO 2+O 2↑
氧气不易溶于水
(3)B;C
CO 2+Ca(OH) 2=== CaCO 3↓+ H 2O
用燃着的木条放在瓶口,若木条立即熄灭,证明集满
(4)④