A. the other substances B. other substances C. the other substance D. others substance 相关知识点: 试题来源: 解析 B substance作“物质”讲时是可数名词。句意:一种物质如果没有和其他的物质混合,它就是一种纯的物质。根据语境可知,这里的“物质”应该是泛指而不是特指。所以,A、C两个选项都不对。
5 A pure solid substance is heated into a liquid from 30 C to 90 C. The substance has a melting point of 60 C. The heating curve of the substance on the temperature-time graph is shown in Fig. 5.1.temperature/℃908070)+X Y6050+40+30time / min Fig. 5.1(a)Describe the differenc...
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这结合以加速的“湿outperformance与一部透明影片的组合,做它理想为介入高清晰标记的应用 [translate] a亚洲渔业水产与养殖论坛 Asian fishery aquatic product and cultivation forum [translate] aThe molecule is the smallest particle of a pure substance 分子是一种纯净的物质的最小的颗粒 [translate] ...
A pure substance is any single type of material that has not been contaminated by another substance. Water is considered a pure substance if the water contains only hydrogen and oxygen. Other examples include gold, silver and salt. In chemistry, a pure substance has a definite composition. It...
• Add this info to your notes that you took from the last section. • Compound- A substance composed of two or more elements that are chemically bonded to form a new substance with different properties. • Example 1- Water. Water’s chemical formula is H2O. • Mixture- a combinati...
When a pure substance is present in a mixture, its properties are retained. There are no definite properties of a mixture. Their composition is variable. For example, table salt and black pepper are kept together in a bowl, salt in water, etc. ...
falls into the ocean quickly become available to other livling creatures.The chemical structure of water also makes it different from almost everything else on earth.Water is a liquid at room temperature and has a relatively high hreezing point.When dissovied gases and soli...
If there is one substance present and one phase present, does this describe a homogeneous mixture, a heterogeneous mixture, or a pure substance? Indicate whether aluminum is a pure substance, heterogeneous mixture, or a solution Are sand ...