Chemistry问题1:An element is a substance that is made up of only one kind of atoms.One kind是指同一个的atom,还是Metal或者non-metal两大类中的一类?2:an element=an atom?有什麼分别?最好举个例子. 相关知识点: 试题来源: 解析 1.化学元素是根据原子核电荷的多少对原子进行分类的一种方法,把核...
24. Which substance is usually found in nature as a liquid, solid, and gas?water B. rock C. metal D. glass 相关知识点: 试题来源: 解析 24. Which substance is usu.ll. :..d in nature as a liquid, solid, and A. water B. rock C. metal l gi ...
Discover the properties that define a substance as a metal and what substances are classified as metals. Explore where to find metals and metal ores, and learn about the physical properties of metals, metal conduction, and how metals are used. ...
题目The term "alloy" refers to a substance that is ___. A. A mixture of two or more metals B. A pure metal C. A non-metallic element D. A mixture of a metal and a non-metallic E. lement 相关知识点: 试题来源: 解析 A 反馈 收藏 ...
Metal A metal is a type of solid substance that is usually hard, and shiny which when freshly polished shows lustre. They are minerals like iron or lead that are found underground in the rocks. These are separated from the rocks using heat. ...
Aluminium or Aluminum is a chemical element found most abundantly in Earth. Basically, it is a metallic substance that is lightweight, non-magnetic, and an excellent conductor of heat, commonly known as foil. The reason people aluminium differently is because of its history. In the nineteenth ...
百度试题 结果1 题目 (4)material A material is A. the type of are a where a building is situated B. a solid substance such as wood, plastic, or metal 相关知识点: 试题来源: 解析 (4)n.B 反馈 收藏
a一般说来金属单质具有金属光泽,大多数金属为银白色;非金属单质一般不具有金属光泽,颜色也是多种多样。 In general the metal simple substance has the metallic luster, the majority metals are the silver-white colors; The nonmetallic simple substance does not have the metallic luster, the color also is ...
题目Which substance is a good conductor of electricity? A. Glass B. Wood C. Metal D. Plastic 相关知识点: 试题来源: 解析 C。本题考查物质的导电性。Glass(玻璃)、Wood(木头)、Plastic(塑料)都是绝缘体,不导电;Metal(金属)是良好的导体。
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