In a scientific context, “pure” denotes a single type of material. Ostensibly, compounds contain more than one type of material. Yet both compounds and elements are considered pure substances. Pure compounds are created when elements combine permanently, forming one substance. For example, when t...
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。
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:一种物质假如没有和其他的物质混合,它确实是一种纯的物质。依照语境可知,那个地点的“物质”应该是泛指而不是特指。因此,A、C两个选项都...
1. Understanding the Statement: The statement we need to evaluate is "A compound is a pure substance." 2. Definition of Pure Substance: A pure substance is defined as a chemical substance that is made up of only one type of particle. These particles can be atoms, molecules, or ions. ...
Is NaCl considered a molecule? Explain. Molecule: A molecule is the smallest unit of a chemical compound. A chemical compound is a pure substance made up of two or more types of elements. All the molecules of a chemical compound are identical. ...
Is Copper Oxide a Pure Substance? Yes, Copper Oxide is considered a pure substance. Copper oxide is formed when Cu reacts with atmospheric oxygen. It is black in color. The color of copper darkens with time due to the formation of CuO on the surface of Cu. CuO has a fixed composition...
QUESTION 8The heating curve for a pure substance at atmospheric pressure is shown in the graph below.12090 A 0 0 0601300Time(minutes)8.1 Write down the following for this pure substance:8.1.1. Melting point 54C(1)8.1.2. Boiling point 93C(1)8.2. Is this pure substance water? Give a re...
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...
Its a part of ATP (Adenosine triphosphate), you know, the compound that fuels every cell in your entire body? Trisodium phosphate is just the salt form of the compound. Mixed with water, it just breaks back down into sodium (table salt) and phosphate! So many people scared of natural ...
aAbePureandpurewhatthe纯物质What 系统标签: substancepuremixture混合物difference物质 What is the difference between a pure substance and a mixture? • 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...