Hess 'Law states that for any chemical reaction, the energy change is path independent.
盖斯定律表明，对于任意化学反应，能量变化并非是路径依赖的。
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。
And that would change what the reference potential is chemical potential is.
这也会改变，参考化学势。
And that's going to change what the chemical potential of a species is.
这回改变，物质的化学势。
There are several chemical processes that can change one hydrocarbon into another.
几个化攻过程就可以将一种碳氢化合物变成另一种。
This is a chemical change, not a physical one.
这是一个化学变化，而不是物理变化。
This change of state is a physical and not a chemical one.
这种状态的变化是物理变化而不是化学变化。
Electricity can bring about chemical change.
电可以引起化学变化。
The dynamic change in chemical process is inevitable and regular.
化工过程的动态变化是必然的、经常发生的。
Thee chemical change gives off heat and light.
这种化学变化发出热和光。
With a change in consciousness, actual chemical changes occur.
靠意识知觉的变化，实际的化学变化出现了。
In a chemical change, energy is not created, nor is it destroyed.
在化学变化、能源是不创造，也就是摧毁。
The chemical change takes place in paper when it burns.
纸燃烧时会产生化学变化。
Nuclear reaction is a chemical change or a physical one?
核反应是化学反应还是物理反应。
This chemical change can be expressed by an equation.
我们可用反应式表示这种化学变化。
This change of state is a physical change and not a chemical one.
这种状态变化是物理变化，而不是化学变化。
When rust 5 is formed, a chemical change has taken place.
当锈形成的时候，就发生了化学变化。
Coal was formed out of dead forests by a long slow process of chemical change.
煤是由埋在地底的森林经过长期而缓慢的化学变化过程而形成的。
Heat and light can be given off by this chemical change.
这种化学反应能放出热和光。
This change of state is a physical change and not a chemical one.
这种状态的变化是物理变化，而不是化学变化。
We saw that a chemical change had taken place.
我们看到已发生了化学变化。
New material can be brought about through chemical change .
通过化学变化可以生成新的物质。
Is this a chemical change or a physical change when wood becomes desks?
木材变成桌子是物理变化还是化学变化？
The fan can change the environment temperature without environment pollution caused by chemical cooling agent.
没有化学制冷剂对环境的污染；
Heat and light can be given off by this chemical change.
这种化学反应能够释放出光和热。
Heat and light can be given off by this chemical change.
这种化学反应能够释放出光和热。
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