chemical change

The chemical change takes place in paper when it burns .

纸燃烧时会产生化学变化。

When two or more elements combine and form a compound , a chemical change takes place .

当两种或两种以上的元素结合形成化合物时，发生化学变化。

Heat and light can be given off by this chemical change .

这种化学反应能放出热和光。

A chemical change always results in forming at least on new substance .

一种化学变化总是产生至少一种新物质。

We saw that a chemical change had taken place .

我们看到已发生了化学变化。

Any change that results in forming a new substance is a chemical change .

导致一种新物质生成的任何变化是化学变化。

This chemical change can be expressed by an equation .

我们可用反应式表示这种化学变化。

Microorganisms are the agents that bring about the chemical change .

微生物是引起化学变化的作用者。

When rust is formed , a chemical change has taken place .

当锈形成的时候，就发生了化学变化。

Magnetic Field Can Cause Chemical Change

磁场能引起化学变化

A chemical change has to take place before the energy can be let loose .

能量释放，必须有化学变化。

A change is not a chemical change unless it results in forming a new substance .

一种变化要是不导致生成新物质，就不是化学变化。

Coal was formed out of dead forests by a long process of chemical change .

煤是由死去森林经过长期而缓慢的化学变化形成的。

Whenever a chemical change takes place , there is a new conference to formed .

每当发生化学变化，就有一种新的物质生成。

In a chemical change , energy is not created & nor is it destroyed .

在化学变化中能量既不能产生，也不会消灭。

Chemical change of fluorocarbon films prepared by sputtering in air

溅射-氟碳高分子膜在空气中的结构和表面自由能变化

Effects of Artificial Fermentation and Aging on the Chemical Change in Flue cured Tobacco

自然醇化与人工发酵对烤烟化学成分变化的影响比较研究

Studies on Chemical Change Type Self-healing Material for Cracks and Its Influence on Durability of Concrete

化学转换型裂缝自修复材料及其对混凝土耐久性的影响研究

A chemical change is one in which the structure of particles is changed and a new substance is formed .

化学变化是改变粒子结构、形成新物质的一种变化。

Chemical Change of ASA in Sizing Process

ASA在施胶过程中的化学行为

A physical or chemical change by which a substance may be detected or its properties ascertained .

化验由一种可被检测到的或其特征能被确定的物质引起的一种物理或化学变化。

Mantle metasomatism is a process of continuing chemical change with in the earth .

地幔交代作用是地球内部的一种化学变化。

When matter is changed to a substance different from what it was , the change is a chemical change .

当物质变成与其原来不一样的另一物质时，这种变化是化学变化。

In the growth and decay of living things there occur even more complex types of slow chemical change .

在生物的生长与衰退中发生着形式甚至更为复杂的缓慢的化学变化。

Interesting , and most easily measured , is a chemical change in ground water before a quake .

有趣、也最容易测量的，是地震前地下水发生的化学变化。

Our infrared emission spectroscopy technology has been shown to be an effective method for analyzing chemical change in friction process .

实验证明，红外发射光谱技术可作为原位观测摩擦过程中化学变化的有效手段。

Mecho-chemical effect is a new borderline subject that studies chemical change of the matter under mechanical action .

机械力化学效应是研究物质在机械力作用下引起的化学变化，是一门新兴的边缘学科。

Mechano-chemical reaction and chemical change in the grinding of mixed PBO and tio_2 powder

PbO和TiO2混合粉磨的机械力化学反应和化学变化

The Chemical Change in Crosslinking Process of JR - ⅱ Emulsion by the Investigation of infrared Spectrometry

红外光谱法研究JR－Ⅱ型乳状液交联过程中的化学变化

Thermoplastic materials can be remelted and cooled time after time without undergoing any appreciable chemical change .

热塑性的材料能够不断的再熔化和再冷却而不需要经历任何可感知的化学变化。