由氧、碳、氢三种元素形成的单质和化合物是初中生学习化学的重点。碳及其化合物又是其中的重中之重了。像金刚石、石墨、一氧化碳、二氧化碳、碳酸钙等物质与生活的联系又是如此的紧密,而且碳的学习又为今后学生学习有机物做了一个很好的铺垫,学习它的必要性可见一斑。同学们学习碳这一章时, The simple substances and compounds formed by the three elements of oxygen, carbon, and hydrogen are the focus of junior high school students’ learning chemistry. Carbon and its compounds are among the most important. Things like diamonds, graphite, carbon monoxide, carbon dioxide, and calcium carbonate are so closely linked to life, and carbon learning has made a good foundation for students to learn about organic matter in the future. The necessity of learning it is evident. When students learn the carbon chapter,