问题
填空题
100mL酒精和100mL水混合在一起后,总体积______200mL.(选填“大于”、“小于”或“等于”)原因是______.
答案
酒精是乙醇的俗称,是由乙醇分子构成的.水是由水分子构成的.由于构成物质的微粒之间存在间隔,因此当酒精和水混合之后,分子和分子之间会相互渗透,故总体积将会小于两者的体积之和.
故答案为:小于,分子之间有一定间隔.
100mL酒精和100mL水混合在一起后,总体积______200mL.(选填“大于”、“小于”或“等于”)原因是______.
酒精是乙醇的俗称,是由乙醇分子构成的.水是由水分子构成的.由于构成物质的微粒之间存在间隔,因此当酒精和水混合之后,分子和分子之间会相互渗透,故总体积将会小于两者的体积之和.
故答案为:小于,分子之间有一定间隔.
仿照所给短文从不同几个方面向同学介绍一下Peter 的学习情况。 | |
at 1 . His math teacher said he was a 2 student and his English teacher said he could speak English 3 . However, his history teacher said he could 4 . Another disappointing result was in music. His music teacher said he 5 . | |
1._____2._____3._____4._____5._____ |