Separation of chemical components is vital in any type of chemical analysis.

Chemical analysis of pesticide intermediate 3 hydroxypropionitrile is reported in this paper.

提出了一种农药中间体3-羟基丙腈的化学分析方法.

This a chemical bond that results from the sharing of valence electrons between atoms.

一种是共价键,是由原子间共享价电子形成.

Studies are also directed towards developing new synthetic methodologies chemical bond making bond breaking processes.

研究亦针对开发造键,拆键的新式合成方法.

Nanotubes are stronger than metal because the chemical bond holding them together is stronger.

纳管之所以比金属硬,是因为把碳原子连在一起的化学键更强.

The chemical bond water, tar, partial sulfur and gas escape from coal during rapid pyrolysis.

煤在快速热解过程中脱除热解水 、 焦油 、 部分的硫和煤气.

VB and MO theories play complementary and coordinate roles in explaining the nature of chemical bond.

VB理论和MO理论在应用和发展中发挥着互补协调、互相促进的作用.

It'say: " Our match is did in heaven, tITe a chemical bond in with us. "

她说: “ 咱们是天作之合, 咱们之间有化学反应. ”

Tending to attract electrons a chemical bond.

电子共享许多核子并产生电子导电的化学键.

This paper mainly discussed the important role of symmetrical principle on atom structure and chemical bond.

本文主要阐述了对称性原理在原子构造中和化学键中的重要作用.

She said: " Our match is made in heaven, there is a chemical bond between us. "

她说: “ 我们是天作之合, 我们之间有化学反应. ”

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.

The chemical change off heat and light.

这种化学变化发出热和光.

New material can be brought about through chemical change.

通过变化可以生成新的物质.

Whenever a chemical change takes place, There is a new substance formed.

每当发生化学变化时, 就有一种新的物质生成.

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

当锈生成时, 就发生了化学变化.

We saw that a chemical change had taken place.

我们看到已发生了化学变化.

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 takes place in paper when it burns.

纸燃烧时就发生了化学变化.

Wherever a chemical change takes place , there is a new substance formed.

每当发生化学反应, 都会产生新物质.

The chemical change absorbing heat is named an end – thermal reaction.

吸收热量的化学反应被称为吸热反应.