(1) If you use potassium permanganate or potassium chlorate to make oxygen needs to be heated, potassium chlorate in manganese dioxide as a catalyst and heating conditions to generate potassium chloride and oxygen, leveling can be; the end of the experiment should be removed from the catheter, after extinguishing the alcohol lamp, the reason is: to prevent the water from backing up, so that the test tube exploded; Therefore, the answer is: 2KClO3
2KCl+3O2↑; the end of the experiment should be removed from the catheter first, and then extinguish the alcohol lamp;
(2) The conditions that should be fulfilled to determine that B should be used as a gas generating device are: the reactants are usually solids and liquids, and the reaction is react at room temperature; so the answer is: the reactants are generally solids and liquids, and the conditions of the reaction are that it is at room temperature;