根据第三段第三句“For instance, when you light a candle, the wax (a type of matter) burns and turns into other substances like heat and light.(例如,当你点燃一支蜡烛,蜡(一种物质)燃烧,变成其他物质,如热和光。)”可知作者是通过燃烧蜡烛的例子来解释化学反应的过程的,故选A。4. 题干:为什么...
In chemistry, matter is made of very small parts called atoms. Atoms form different substances. For example, water is made of two types of oxygen.Sometimes, atoms can change and make new substances. This happens in chemical reaction. For instance, when you light a candle, the wax (a type...
What we used in the experiment(在实验中我们所用到的)wasaglassandacandle. 相关知识点: 试题来源: 解析 答案:The purpose of this experiment is to;What we used in the experiment.这个实验的目的是The purpose of this experiment is to;在实验中我们所用到的What we used in the experiment. 故填The...
I'm looking for someone to create five generic science experiment videos along with a text script explaining what you're doing. You ca… Chemistry Science See more Candle Chemist Needed for Custom Formulations Fixed-price ‐Posted 14 days ago $200 Fixed-price Intermediate Experience level We...
Candle Science Project Ideas Growing Crystals with Borax Project How to Make Salt Crystals: At-Home Experiment Create an account to start this course today Used by over 30 million students worldwide Create an account Explore our library of over 88,000 lessons Search Browse Browse by subject...
When he placed the mineral under sunlight amplified by a powerful magnifying glass, he found that a gas was produced which he described as having an “exalted nature” because a candle burned in the gas brightly (Priestley, 1775). Without realizing it, Priestley had discovered oxygen as a ...
(ASE) in the U.K. published a blueprint forEducation through Science(ASE, 1985) where they pointed out that science education should have “relevance: science education should draw extensively on the everyday experience of pupils.” In 1986 we ran a conference for Irish chemistry teachers on ...
preparation of 1 liter of solution of a given concentration. These titrants are produced industrially and are marketed in sealed glass ampuls. Standard solutions must be stored under conditions that ensure a constant composition; here, the chemical nature of the solute must be taken into account....
a combustion, very slow to be sure, but perfectly similar to that of carbon.”1Needless to say, what distinguishes the candle from the guinea pig is that respiration is a continuous process of breakdown and energy capture. As Lane puts it, “Respiration is a controlled form of combustion. ...
candle waxes are amorphous solids composed of large hydrocarbon molecules. Some substances, such as boron oxide (shown in Figure 2), can form either crystalline or amorphous solids, depending on the conditions under which it is produced. Also, amorphous solids may undergo a transition to the crys...