论文部分内容阅读
差量法是依据化学反应前后的某些“差量”(固体质量差、溶液质量差、气体体积差、气体物质的量之差等)与反应物或生成物的变化量成正比而建立的一种解题方法。此法将“差量”看作化学方程式右端的一项,将已知差量(实际差量)与化学方程式中的对应差量(理论差量)列成比例,其他解题步骤与按化学方程式列比例或解题完全一样。使用差量法计算一个最突出的优点是,不需要在乎反应物是否反应完全,只要有反应发生就有差量存在,因此根据差量计算出来的反应物的量是实际参加反应的量。
Difference method is based on the chemical reaction before and after some “difference ” (poor solid quality, poor solution quality, gas volume difference, the difference between the amount of gas substances, etc.) and reactants or products is proportional to the amount of change A solution to the problem. This method treats the “difference” as one of the right-hand side of the chemical equation, with the known difference (actual difference) in proportion to the corresponding difference (theoretical difference) in the chemical equation. The other solution steps According to the chemical equation column or solve exactly the same problem. One of the most prominent advantages of using the difference method is that it does not matter whether the reactant is completely reacted or not, as long as there is a difference in the reaction, so the amount of the reactant calculated from the difference is the amount actually added to the reaction.