论文部分内容阅读
无数据计算题较特殊,字里行间无数字出现,在一定程度上增大了解题的难度和迷惑性。现举例如下,仅供大家参考。 一、等量法 在化学反应中,当物质增加、减少或转化的量与另一物质的量相等时常用此法。 例1.将硝酸铜和锌粉的混和物在空气中灼烧,至其质量不再改变为止。冷却后称量知其质量和原混和物质量相同。求原混和物中锌的百分含量。 解题思路:本题涉及的有关反应是:
The data-less calculation problem is more special. There are no numbers between lines in the word. To a certain extent, it increases the difficulty and obfuscation of the problem. Examples are as follows, for your reference only. First, the equal method In the chemical reaction, when the amount of material increase, decrease or conversion is equal to the amount of another material, this method is commonly used. Example 1. A mixture of copper nitrate and zinc powder was burned in air until its mass no longer changed. After cooling, it is known that the mass is the same as the quality of the original mixture. Find the percentage of zinc in the original mixture. Problem-solving ideas: The relevant reactions involved in this question are: