论文部分内容阅读
一、判断题(每小题1分,共10分) 1.化学变化的本质是有新物质生成. ( ) 2.空气是由多种物质组成的混和物,各成分保持原来的性质. ( ) 3.凡是含氧元素的物质都是氧化物. ( ) 4.用化学方法不能再分的微粒是原子. ( ) 5.比是由两个氢元素和一个氧元素组成. ( ) 6.一个双氧水分:f(H
I. Judgment Questions (1 point for each question, 10 points in total) 1. The nature of chemical change is the creation of new substances. () 2. Air is a mixture of many substances, each of which maintains its original properties. ) 3. Any substance containing oxygen is an oxide. () 4. Particles that cannot be separated by chemical means are atoms. () 5. The ratio is composed of two hydrogen elements and one oxygen element. () 6. A hydrogen peroxide water: f (H