在化学反应中，我们用enthalpy change(焓变)表示energy（能量）变化，涉及到的enthalpy change种类繁多...
enthalpy change of formation；
enthalpy change of combustion；
enthalpy change of neutralisation；
enthalpy change of solution；
enthalpy change of atomisation,
enthalpy change of hydration等等
小伙伴们能分得清楚吗？
今天我们来具体解读一下这“各种”enthalpy change，在理解的基础上会更好记忆哦！
01
Enthalpy change
The energy exchange between a chemical reaction and its surroundings at constant pressure.
Enthalpy change，指的是某化学反应在特定的压强下与周围环境之间的能量交换，通常用ΔH来表示。
02
Standard condition
Each substance involved in the reaction is in its normal physical state (solid, liquid or gas) at 100kPa and 298K.
通常我们研究的enthalpy change是指物质在标准条件（100kPa和298K）下的正常物理状态，用“Image”这个符号来表示。
03
The first ionisation energy
The amount of energy required to remove one electron from each atom in one mole of atoms of the element in the gaseous state (to form gaseous 1+ ions).
理解第一电离能，一定是一个气态原子失去一个电子吸收的能量。失去电子后这个气态原子自然变成了正离子。
04
The first electron affinity
The first electron affinity, is the enthalpy change when 1 mole of electrons is added to 1 mole of gaseous atoms to form 1 mole of gaseous 1– ions under standard conditions.
electron affinity指的是一个气态原子得到一个电子对应的能量变化，得到电子后自然带负电。
05
Lattice energy
Lattice energy is the enthalpy change when 1 mole of an ionic compound is formed from its gaseous ions under standard conditions.
理解lattice energy的关键是要从气态离子生成1mol的离子化合物对应的能量变化。
06
The standard enthalpy change of formation
The enthalpy change when one mole of a compound is formed from its elements under standard conditions.
关键：从element（单质）生成1mol化合物对应的能量变化。
07
The standard enthalpy change of atomisation
The enthalpy change when one mole of gaseous atoms is formed from the element in its standard state under standard conditions.
关键：从element（单质）生成1mol气态原子对应的能量变化。详情咨询老师即可~
