chemical change

1. The chemical change takes place in paper when it burns.
   纸燃烧时会产生化学变化。
2. 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。
3. An experiment was designed to test the hypothesis that long-term memory implies a chemical change in the brain cells while short-term memory involves patterns of impulses in circuits of nerve cells.
   科学家们认为长时记忆牵涉到脑细胞的化学变化，而短时记忆涉及到神经细胞里线路的脉冲方式，他们设计了一个试验来验证这个假设。
4. 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。
5. 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。
6. Microorganisms are the agents that bring about the chemical change.
   微生物是引起化学变化的作用者。
7. 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。
8. This paper inquired into physical property and chemical property about amino acid, and the chemical change of amino acid in soy sauce under given conditions.
   重点讨论了氨基酸的一般物理性质和化学性质，及酱油内的氨基酸在一定条件下的化学变化。
9. 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。
10. Researchers looked for-and found-a chemical change called DNA methylation in healthy tissue adjacent to breast tumors.
    研究者寻找并发现了靠近肿瘤组织的健康组织中有“DNA甲基化”这种化学改变。
11. We may define chemistry as the science in which we deal with the chemical change in matter as a result of which it is possible to form a new stance.
    我们将化学定义为：在人们中，处理物质间化学变化，并且此变化可能会产生一个新物质的科学家。
12. Heat and light can be given off by this chemical change.
    这种化学反应能放出热和光。
13. 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。
14. 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。
15. The control of gases involves the removal of the pollutant from the exhaust gas stream, a chemical change in the pollutant, or a change in the process producing the pollutant.
    气体的控制包括：从排气流中除取污染物，使污染物产生化学反应，或改变产生污染物的流程。
16. 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。
17. 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。
18. Some drug ingredients may have conflicts with those in foods or cause chemical change leading to being sick, vomiting and uncomfortable.
    某些药物成分可能跟食物中一些成分发生矛盾，或者起化学变化，喝了后会令人恶心、呕吐和不适。
19. 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。
20. 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。
21. This chemical change can be expressed by an equation.
    我们可用反应式表示这种化学变化。
22. General term for compounds or materials that slow down or stop an undesired chemical change such as corrosion, oxidation or polymerization, drying, skinning, mildew growth, etc.
    延缓或阻止不希望发生的化学变化的化合物或材料的通称，例如腐蚀、氧化或聚合、风干、油漆起皮、霉菌生长等现象。
23. 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。
24. It's a state function, so we're at constant temperature and pressure, and now we want to consider some chemical change or a phase transition or you name it.
    这就是态函数，我们处于恒定的温度和压强之下，然后考虑某些化学变化或者相变，或者你想考虑的东西。
25. Any change which alters the chemical properties of a substance is a chemical change. For example, the rusting of iron is a chemical reaction.
    任何改变物质化学性质的变化都是化学变化。例如，铁钉的生锈就是一种化学变化。
26. We saw that a chemical change had taken place.
    我们看到已发生了化学变化。
27. 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。
28. Due to its'atomic resolution, STM can be used to induce the nanoscale physical or chemical change on the surface.
    STM由于其原子级的空间分辨能力，可以诱导表面发生高度局域化的物理或化学变化。
29. 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。
30. A substance that undergoes a rapid chemical change ( with the production of gas) on being heated or struck.
    加热或碰撞后会发生急速化学变化（并产生气体）的物质。

noun

1. (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved

   Synonym:    chemical processchemical action