When this happens, thethiols attach to the ionic liquid and their bad scent isinactivated as the perfume had been. This means thewater in sweat and its thiols are both able to releasethe fragrance from the newly developed perfume.4. Which of the following makes the scent-deliverysystem ...
The chemical reaction happens___adding two substances together. A. with B. by C. for D. at 相关知识点: 试题来源: 解析 B。by adding two substances together表示“通过把两种物质加在一起”,by表示“通过……方式”,符合语境。with表示“用”;for表示“为了”;at表示“在……”,均不符合题意。
75K This lesson will cover what happens when a chemical reaction occurs, the types of chemical reactions, and how to know if a chemical reaction occurs. Related to this QuestionHow is baking a cake a chemical reaction? Is baking bread a chemical reaction? What do chemical reactions produce?
What happens to matter during a chemical reaction? Reactions: There are two general types of changes, physical and chemical. Both involve energy transfer and changes to the matter. We can determine if a change is physical or chemical based on what exists after the reaction. ...
What happens when fossil fuels are burned?Fossil fuels are rich in carbon. When they are burned, a chemical reaction occurs that uses up the fuel and oxygen to create energy, water, and carbon dioxide. This reaction is known as combustion....
We observe a chemical reaction. What usually happens during a chemical reaction? A. change in color B. production of gas C. formation of a precipitate D. all of the above 相关知识点: 试题来源: 解析 D。本题考查化学变化的现象。化学变化通常会有颜色变化、产生气体、生成沉淀等现象。
When iron rusts, it is a chemical change. What happens during this process? A. The color remains the same. B. No chemical reaction occurs. C. A new substance is formed. D. The mass of iron decreases. 相关知识点: 试题来源: 解析 C。铁生锈是化学变化,在这个过程中会形成新物质。A ...
When we introduced friendly and unfriendly smells at the same time, the fish seemed unable to make up their minds, spending equal time swimming toward one smell and the other. They could sense chemical signals but couldn’t recognize the meaning of them. It is always tricky to say that ...
The overall order of reaction:the sun of the individual orders,x+y Colorimetry measures the intensity of a color in a reaction mixture with time, such as in the oxidation of iodide ion to give brown iodine.In clock reaction the reaction is timed until a sudden color change happens when a ...
This happens in a process called a chemical reaction. For instance, when you light a candle, the wax (a type of matter) burns and turns into other substances like heat and light.Studying chemistry helps us understand why things happen in nature and around us. It also helps people make ...