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联系到称量数值、实验数据进行的计算,都应当注意有效数字。有效数字的多少决定于实验测定的具体条件。有效数字里最后一位为存疑数字,以前各位都应为可靠数字。同学们学习过定量分析化学就熟悉有效数字及其在一般运算(加、减、乘、除)中的规则。在以后实验性课程中完全有条件按有效数字处理规则进行有关计算,可是实际上忽视有效数字的不合理情况还仍然存在。这对巩固、提高学生的处理有效数字能力也是很不利的。在定量分析课之后,物理化学是计算内容较多的课程。当前,国内
The calculations relating to weighing values and experimental data should all pay attention to valid figures. The number of significant figures depends on the specific conditions of the experimental determination. The last digit in the valid figure is the doubtful figure. Everyone should be a reliable figure before. Students learn quantitative analysis chemistry to be familiar with the effective numbers and their rules in general operations (add, subtract, multiply, divide). In later experimental courses, it is entirely possible to carry out relevant calculations according to effective digital processing rules. However, the irrational situation that actually ignores valid figures still exists. This is also very unfavorable for consolidating and improving students’ ability to deal with effective numbers. After the quantitative analysis course, physical chemistry is a course that calculates more content. Currently, domestic