Difference Between Thermal Decomposition and Thermal Dissociation

Key Difference – Thermal分解与热解离

Heatis a form ofenergythat can be transferred between two substances. Heat can be used to ionize a substance or to decompose a substance. The terms thermal decomposition and thermal dissociation are often used interchangeably. Although these terms express the same idea of separation of substances into counterparts, they are different from each other. Thekey differencebetween thermal decomposition and thermal dissociation is thatthermal decomposition is the breakdown of large substances into smaller substances using heat whereas thermal dissociation is the ionization of a substance using heat.

内容

1.Overview and Key Difference
2.What is Thermal Decomposition
3.What is Thermal Dissociation
4.Similarities Between Thermal Decomposition and Thermal Dissociation
5.Side by Side Comparison – Thermal Decomposition vs Thermal Dissociation in Tabular Form
6.概括

What is Thermal Decomposition?

热分解是由热引起的化学分解形式。也称为热解。The temperature at which the decomposition initiates is known asdecomposition temperature。It is a multi-step process.

Decomposition involves the breakdown of chemical bonds. In order to break a chemical bond, energy should be given from outside. Therefore, a thermal decomposition is usually anendothermic reaction。The most common example for substances that undergo thermal decomposition is transition metal carbonates.

穰mple of Thermal Decomposition

• Calcium carbonate(CaCO₃) decomposes into calcium oxide (CaO) and carbon dioxide (CO₂) when heat is provided.

CaCO_3(s)→CAO_(s)+ CO_2(g)

• Thermal decomposition of mercuric oxide gives mercury metal and oxygen.

2HgO → 2Hg + O₂

• 氧化铁的热分解形成氧化铁和二氧化碳。

FeCO₃→FeO + CO₂

什么是热解离？

Thermal dissociation is the电离of a substance using heat. The substance is separated intocationic and anionic counterparts。这是一个单个步骤过程，其中包括将物质分为两部分。该反应通常是一个可逆的过程，一个化学键被打破。

原始化合物可以通过冷却反应混合物来获得，因为该过程是可逆的。

穰mple

CH₃Br → CH₃⁺+ Br^–

CH₃-CH₃→CH₃⁺+ CH₃^–

What is the Similarity Between Thermal Decomposition and Thermal Dissociation?

• Both Thermal Decomposition and Thermal Dissociation are processes that include the separation of a substance into small substances using heat energy.

热分解和热解离有什么区别？

热分解与热解离
热分解是由热引起的化学分解形式。	Thermal dissociation is the ionization of a substance using heat.
Steps
热分解是一个多步骤过程。	Thermal dissociation is a single-step process.
Process
热分解包括将物质分解为两个或多个对应物。	Thermal dissociation includes the separation of a substance into ions.

摘要 - 热力分解与热解离

Thermal decomposition and dissociation are two related terms that are often used interchangeably. But there are differences between these terms. The difference between thermal decomposition and thermal dissociation is that thermal decomposition is the breakdown of large substances into smaller substances using heat whereas thermal dissociation is the ionization of a substance using heat.

Reference:

1.“Thermal decomposition.” Wikipedia, Wikimedia Foundation, 17 Feb. 2018.Available here
2.“Thermal decomposition .” Study.com.Available here

Image Courtesy:

1.’Calcium carbonate rocks’By Ferdous – Own work,(CC BY-SA 3.0)viaCommons Wikimedia
2.’Heterolysis tert-Butyl Bromide V’By Jü – Own work, (Public Domain) viaCommons Wikimedia