1.简单
Which state of matter has neither a fixed shape nor a fixed volume?
- AGas
- BCrystal
- CSolid
- DLiquid
Which state of matter has neither a fixed shape nor a fixed volume?
氯化钠(食盐)靠哪种键结合在一起?
元素的原子序数告诉你什么?
Which halogen is the most reactive?
Which type of radiation can be stopped by a sheet of paper?
一个镁原子失去两个电子。形成的离子是什么?
Cotton soaked in ammonia (NH₃) and cotton soaked in hydrogen chloride (HCl) are placed at opposite ends of a glass tube. A white ring of ammonium chloride forms closer to the HCl end. What does this show?
某物质在 801 °C 熔化,固态时不导电,熔融时导电。它最可能是哪类物质?
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