组合和分解反应之间的差异

关键差异 - 组合与分解反应

A化学反应is the conversion of one or more chemical化合物变成一种或多种不同的产品，改变化合物的身份。化学反应的起始材料称为reactantand the resulting compound is called the product. Breakdown of compounds or combination of compounds and formation of new compounds will occur during a chemical reaction process since the bonds between atoms of the compound are broken and created in a different manner. Chemical reactions can be divided into several broad categories. Redox reactions or氧化还原反应在其中非常重要。氧化和还原反应称为电子转移反应，因为反应物的电子从一种化合物转移到另一种化合物以引起反应。在氧化还原反应中，两个平行反应同时称为半反应。这些半反应显示了转移electrons。通过平衡这些半反应，人们可以猜测最后发生的总体反应。组合反应和分解反应是两种主要类型的氧化还原反应。组合和分解反应之间的主要区别在于combination reaction involves a combination of reactants to give a single productwhereasdecomposition reaction involves the breakdown of a single compound into two or more products.

内容
1.Overview and Key Difference
2.What is a Combination Reaction
3.What is a Decomposition Reaction
4.并排比较- vs Decomposi组合tion Reaction
5.概括

What is a Combination Reaction?

A combination reaction, also called assynthesis reaction, is a reaction in which reactant compounds are combined to form a different compound as the product. In other words, the reaction of simple molecules results in a complex molecule. Some or all the bonds between atoms of that particular compound are broken down; at the same time, atoms will combine to form the new compound, which is the product. In decomposition reactions, the same reactant acts as the starting material for both half reactions. Unlike in decomposition reactions, the half reactions in combination reactions have different reactants to begin with. Combination reaction results in a single product. Following is a common example that can be given as combustion reactions.

For example, when Aluminium(Al) is placed in liquid bromide (Br₂）组合反应发生并产生溴化铝（Albr）₃). Here, theoxidation numberis increased in Al and decreased in Br. Therefore, it is a redox reaction and is a combination reaction since two reactants have reacted to give one particular product.

What is Decomposition Reaction?

Decomposition reaction is another important reaction in the category of redox reactions. It is basically the opposite of combination reaction. A decomposition reaction is a reaction where reactant compound is broken down into products. Here, half-reactions occur at the same time as the oxidation reaction and the reduction reaction. But unlike in combination reaction, the reactant for both half reactions is the same in decomposition reactions. Decomposition reaction results in several products.

In the electrolysis of water, whendirect currentis passed through water, water molecules are decomposed to give oxygen and hydrogen gases. Here, the oxidation number is increased in oxygen atom and is decreased in hydrogen atom. Hence, it is a redox reaction and a decomposition reaction due to the breakdown of water molecules into oxygen and hydrogen gases.

What is the difference between Combination and Decomposition Reaction?

Combination vs Decomposition Reaction
Two or more reactant compounds are involved in combination reactions.	单个化合物参与分解反应。
Products
Combination reaction results in a single product.	Decomposition reactions result in several products.
Half Reactions
In combination reactions, two half reactions have two different starting molecules.	In decomposition reactions, a single molecule act as the starting material for both half reactions.
化学键
组合反应导致原子粘结以产生单最终产物。	In decomposition reactions, chemical bonds are broken down to form two or more end products.
分子
组合反应会导致简单分子反应并产生复杂的分子。	分解反应导致复杂分子分解为简单分子。

摘要 - 组合与分解反应

氧化还原反应非常是我们周围世界的一部分，因为大多数重要的化学反应是氧化还原反应。组合反应和分解反应是彼此相反的简单反应。组合反应和分解反应之间的主要区别在于，组合反应涉及两个或多个反应物分子的组合，从而导致单个终极产物，而分解反应涉及将单个分子分解为两个或多个产物。

参考：
1.Chang, R., 2010. chemistry. 10th ed. NewYork: McGraw-Hill.
2.Redox. (2009, July 30). Retrieved May 29, 2017, from https://weakinteractions.wordpress.com/primers/redox/
3.反应。（n.d。）。2017年5月29日从http://www.ric.edu/faculty/ptiskus/reactions/检索

Image Courtesy:
1. “Miller Ferrocen Synthese” By Bert.Kilanowski – Own work (CC0) viaCommons Wikimedia
2. Daniele Pugliesi的“化学反应” - 自己的工作(CC BY-SA 3.0)viaCommons Wikimedia[裁剪]