(1)铁架台;集气瓶
(2)③⑤;2KMnO 4
K 2MnO 4+MnO 2+O 2↑
(3)CaCO 3+2HCl==CaCl 2+CO 2↑+H 2O;澄清的石灰水(或石蕊溶液、燃着的木条等)
(4)①③