MEMO To: Factory staff From: Factory Manager Date: 19 November 2008 Subject: Quality control The new system starts Monday week. Please read attached leaflet and contact me if there are any queries. What does the Factory Manager want the staff to do?
A.
Suggest additions to quality-control instructions.
【简答题】苯(C6H6)是一种重要的有机溶剂,它的部分同系列物质如下: 碳原子数 6 7 8 9 10 化学式 C 6 H 6 C 7 H 8 X C 9 H 12 C l0 H 14 (1)比较归纳是学好化学的重要方法.据表推测: ①X的化学式为______. ②上述物质的共同特点有______(写出一条即可). (2)在C 6 H 6 中,C与H的质量比为______,碳元素的质量分数为______.