What is the molecular formula of acetone? What is solubility in physical chemistry? What is a pure substance in chemistry? The greatest solvent in the world is What is a compound in chemistry? What is dissolution in chemistry? What property of water allows water to work as a universal solven...
A pure substance is a classification of matter wherein its components cannot be broken down or separated by using physical methods. These methods... Learn more about this topic: Pure Substance in Chemistry | Definition, Properties & Examples ...
A. The balance was not calibrated properly. B. The color of the substance was bright. C. The laboratory was too cold. D. The students were in a hurry. 相关知识点: 试题来源: 解析 A。解析:测量物质质量不一致可能是因为天平没有正确校准,A 选项正确。B 选项物质颜色亮不会影响质量测量。C 选...
Sublimation in chemistry refers to thephase transition in which matter changes state from a solid immediately into a gas, without passing through an intermediate liquid phase. Sublimation occurs when atmospheric pressure is too low for a substance to exist in liquid form. Sublimation is the inverse ...
In chemistry, a compound is a substance made up of two or more different chemicalelementscombined in a fixed ratio. When the elements come together, they react with each other and form chemical bonds that are difficult to break. These bonds form as a result of sharing or exchangingelectronsbe...
Amixtureis what you get when you combine twosubstancesin such a way that nochemical reactionoccurs between the components, and you can separate them again. In a mixture, each component maintains its own chemical identity. Typically mechanical blending combines components of a mixture, although other...
Substances can often be mistaken with mixtures, when in fact they are two very separate concepts when it comes to chemistry and hazardous chemicals. The following isa basic comparison of both substances and mixtures: Chemical Substances A chemical substance is defined as a form of matter that has...
No exact definition of an “organic” substance has been agreed upon by the chemical community and textbook definitions vary substantially. The question of what exactly constitutes an “organic” substance is explored in this paper. Various carbon-containing substances that have been by some considered...
What Is This Substance? What Makes It Different? Mapping Progression in Students' Assumptions about Chemical Identity. Int. J. Sci. Educ. 2014, 36Ngai, C., Sevian, H., and Talanquer, V., What is this Sub stance? What Makes it Different? Mapping Progression in Students' Assumptions ...
In chemistry, concentration refers to the amount of a substance in a defined space. Another definition is that concentration is the ratio ofsolutein a solution to eithersolventor totalsolution. Concentration is usually expressed in terms ofmassper unitvolume. However, the solute concentration may al...