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These are physical changes while those are chemical changes. 这些是物理变化而那些是化学变化。
Sun, air and wind cause quick chemical changes. 太阳、空气和风引起快速的化学变化。
Some kinds of acids react on metals to cause chemical changes. 有几种酸对金属起作用，会引起化学变化。
We do not consider melting or boiling to be chemical changes. 我们认为熔化或沸腾不是化学反应。
We saw that a chemical change had taken place. 我们看到已发生了化学变化。
Based on a series of experiments ,a satisfactory physic chemical method was selected for clarification of crude sulphate turpentine. 对粗硫酸盐松节油的净化方法加以探讨,总结出较为理想的化学-物理净化法。
A chemical change takes place in any substance when it burns. 物质燃烧时产生化学变化。
These crystals may help begin the chemical changes that result in the destruction of ozone. 这些晶体可以有助于触发导致臭氧受到破坏的化学变化。
All changes of matter fall into two broad classes: physical and chemical changes. 物质变化分为两大类：物理变化和化学变化。
Most familiar chemical changes do not involve so spectacular a liberation of energy as the zinc-sulfur reaction. 大多数化学反应并不象锌-硫反应那样会放出如此引人注目的能量。
It has been preliminary studied by analysed the changes of physical chemical condition of auriferous fluid caused by hydrothermal boiling. 仅从热液沸腾造成含金热液物理化学条件改变的角度对这一关系进行初步探讨。
Microorganisms are the agents that bring about the chemical change. 微生物是引起化学变化的作用者。
This chemical change can be expressed by an equation. 我们可用反应式表示这种化学变化。
New material can be brought about through chemical change. 通过化学变化可以生成新的物质。
Heat and light can be given off by this chemical change. 这种化学反应能放出热和光。
The article introduced the physical chemical properties of the polyglycerol. 介绍了聚合甘油的物理化学性质。
As is mentioned above ,substances are constantly undergoing physical and chemical changes . 如上所述，物质总是在进行着物理变化和化学变化。
A chemical change takes place in paper when it burns. 纸燃烧时产生化学反应。
This ionization process often results in chemical changes in living tissues, which can lead to injury in the organism. 这个电离过程通常会引致生物组织产生化学变化,因而对生物构成伤害。
When people are mentally engaged, great chemical changes would take place in some cognitive areas. 当人们用脑的时候,在某些认知区域中就会发生巨大的化学变化。