论文部分内容阅读
一、仪器用途例1下图是实验室中常见的化学仪器,你可能已使用过多次。请按下列要求把仪器的名称填在答卷的相应位置:1少量溶液相互反应时,需要用;2吸取和滴加少量的液体时,需要用;3配制溶液,溶解一定量的溶质时,需要用;4蒸发溶液时,需要用;5收集少量气体时,需要用。解析:了解仪器的用途及注意事项是做好化学实验的前提。量筒的用途是量度液体的体积,不可用作反应容器,不能加热;试管可用作少量试剂的反应容器,加热使用时不能骤冷;蒸发皿用来加热
First, the use of the instrument Example 1 The following diagram is a common chemical instrument in the laboratory, you may have used it many times. Please fill in the name of the instrument in the corresponding position of the answer sheet according to the following requirements: 1 When a small amount of solution reacts with each other, it needs to be used; 2 When a small amount of liquid is absorbed and added, it needs to be used; 3 When preparing a solution, when a certain amount of solute is dissolved, it is required. Use; 4 Evaporation solution, need to use; 5 to collect a small amount of gas, you need to use. Analysis: Understanding the purpose of the instrument and its precautions are prerequisites for doing a good chemical experiment. The purpose of the graduated cylinder is to measure the volume of the liquid, it can not be used as a reaction vessel and can not be heated; the test tube can be used as a reaction vessel for a small amount of reagents, and can not be quenched when heated; the evaporating dish is used for heating