As the picture shows, from left to right, Xiaozhen, Xiaoshan and Xiaomei explore the experiment of burning conditions of substances. (Information point: When inhaling or contacting phosphorus pentoxide,
(1) Phosphorus pentoxide, the product of white phosphorus combustion, is toxic and will pollute the air. After inhalation, it can react with the moisture on the mucosal surface, eyes and skin to generate phosphoric acid, which has a strong corrosive stimulation on the local area and can cause toxic pneumonia and pulmonary edema in severe cases. Therefore, it must be carried out in a closed container. Xiaomei did this, not only paying attention to sealing, but also putting an end to the environmental pollution caused by phosphorus pentoxide. The reason for not choosing other experimental schemes is that the devices designed by Xiaozhen and Xiaoshan are not airtight enough, and white smoke will escape.
(2) The white phosphorus on the copper sheet can burn, but the white phosphorus immersed in hot water can't burn, indicating that the combustible needs oxygen.
(3) The reason why the red phosphorus on the copper sheet can't burn is that the temperature of the red phosphorus has not reached the ignition point.
(4) The phenomenon of test tube 3 is that the burning of white phosphorus produces a large amount of white smoke, and the liquid level in the test tube rises.
So the answer is: (1) Xiaomei; The device designed by Xiaozhen and Xiaoshan is not airtight enough, and white smoke will escape; (2) Fuel combustion needs oxygen; (3) The temperature of red phosphorus has not reached the ignition point; (4) The burning of white phosphorus produces a lot of white smoke, and the liquid level in the test tube rises.