专业英语教案

一、教学目的及要求： 使学生了解和掌握元素和化合物的部分词汇及其构成，理解课文内容和翻译。理解专业英语的学习方法、教学要求和成绩考查方法。 二、教学内容提要： 学习 lesson one Text A Element and Compounds All matter is composed of basic substances called element. An element cannot be broken down into simpler units by chemical reactions; it contains only one kinds of atom. An atom is the smallest characteristic unit of an element. A compound is a substance that can be spit into two or more element. Water is a compound because it can be spit into its components, hydrogen and oxygen. The formula of a compound gives information about the kinds and numbers of atoms that make up each molecule of that compound. A formula contains the symbols of the kinds of atoms in each molecule and subscripts that indicate the number of each kinds of atom in the molecule. For example, the formula for waterH2Oindicate that a water molecule contains two hydrogen atoms and one oxygen atom; and a molecule of the glucose, C6H12O6, contains six carbon atoms, twelve hydrogen atoms, and six oxygen atoms. When carbon unites with oxygen, it forms a colorless, odorless, and tasteless gas called carbon dioxide, which is heavier than air and will extinguish flame. Carbon dioxide is like nitrogen in many ways, but if it is mixed with limewater, it causes the clear liquid to become milky, while nitrogen does not. This is the test for carbon dioxide. Carbon dioxide is a source of plant food. Plants have the power to take this gas from the air, combine it with water, and make it into their tissues; in fact it is from this source that all organic carbon comes. Mineral compounds are made of elements such as sulphur, phosphorus, iron, pot...