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1.排放列空气中的有害物质有两大类:粉尘和气体;有害气体主要有三种:SO2、CO、NO2. 2.燃烧的两个条件:一是可燃物要与氧气接触;二是要使可燃物达到着火点. 3.构成物质的三种粒子:原子、分子、离子. 4.氢能源的三大优点:一、来源广;二、燃烧放热多;三、燃烧后不污染环境. 5.元素有三类:稀有气体元素、金属元素、非金属元素.
1. Emissions of harmful substances in the air There are two major categories: dust and gas; there are three main types of harmful gases: SO2, CO, and NO2. 2. Two conditions of combustion: First, the combustibles must be in contact with oxygen; second is to Make the flammables reach the ignition point. 3. The three kinds of particles that make up the substance: atoms, molecules, ions. 4. The three major advantages of hydrogen energy: First, the source is wide; Second, the combustion exothermic; Third, the combustion does not pollute the environment. 5. There are three types of elements: rare gas elements, metal elements, and non-metallic elements.