催化剂能改变化学反应的速度而不参加反应。
A catalyst changes the speed of chemical reaction without entering into it.
气体反应的系数表明2l氢气与1l氧气反应，剩余1 L氧气未参加反应。
Thee coefficient of this gaseous reaction show that 2l of hydrogen react with 1l of oxygen, leaving 1l of unreacted oxygen.
这些元素，不像过渡金属那样显示出可变的化合价，他们只有最外层电子参加反应。
These elements, unlike the transition elements, do not exhibit variable oxidation states, and their valence electrons are only present in their outer shell.
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