The word "pure" in front of "substance" is unnecessary, since the definition of substance implies purity. A substance is a sample that is chemically uniform in composition. In other words, all particles of that sample are the same chemically (whether they are atoms or molecules or ionic lattices or what have you).

2018年2月17日 · A mixture is when two or more substances combine physically together.. However, in water, two hydrogen atoms combine with one oxygen atom chemically, forming a new substance that has properties different from hydrogen alone or oxygen alone.

2024年5月21日 · Zinc chloride is a pure substance because it is composed of only one type of molecule, specifically zinc and chlorine atoms bonded together in a fixed ratio. It is not a mixture, which consists of ...

2024年5月25日 · Zinc chloride is a pure substance because it is composed of only one type of molecule, specifically zinc and chlorine atoms bonded together in a fixed ratio. It is not a mixture, which consists of ...

2024年5月26日 · Chromium is a pure substance. It is a naturally occurring element with a specific atomic structure and chemical composition. It is not composed of different types of atoms or molecules, which is a ...

2024年5月20日 · A pure substance is any form of matter that has a uniform composition and cannot be separated by physical methods such as filtration. A mixture can be separated into its components by physical means.

2017年9月27日 · That's true, but "pure" here does not refer to purity as you using the word. It refers to purity of essence in that the substance is not constituted from multiple parts by simple mixing. We can't, but again, that's not what pure here is supposed to imply. Oxygen is a pure substance whether it's mixed or not because it is an element. A mixture ...

is blood a mixture or pure substance , hetero or homogeneous? Blood is a mixture because it is composed of different components such as red blood cells, white blood cells, platelets, and plasma.

2024年5月22日 · A mixture is a mix of pure substances while a pure substance can be made up of a single element or compound. Pure Honey and distilled water are both pure substances. Ranch and Italian salad ...

2024年6月6日 · A pure substance is classified by having a definite and constant composition. The substance can be either an element or a compound, but what makes the substance pure, is that it does not vary.