Flashcard卡片学习法是一种久经考验的学习工具，不论是学单词，记定义，ALevel化学记反应方程式，数学易错题，实验装置图，还是物理记公式，flashcard都可以很好地帮助我们高效的记忆，并且自己制作flashcard的过程本身就是非常有效的复习。
ALevel化学Lattice enthalpy部分有好多个定义，比较难区分，也比较难记忆，今天我们通过制作flashcard来复习ALevel化学Lattice enthalpy部分的几个enthalpy change的定义吧。
Q：What is the first electron affinity？
A：The first electron affinity of an element is the energy change when each atom in none mole of gaseous atoms gains one electron to form one mole of gaseous ions with a single negative charge
Q：The lattice energy
A：The lattice of an ionic solid is the standard enthalpy change when one mole of the compound forms from free gaseous ions.
Q：Definition of Hess's Law
A：Hess's law says that the enthalpy change in converting reactants to products is the same regardles of the route take, provided the intial and final conditions are the same.
Q：The standard enthalpy change of formation
A：The enthalpy change when one mole of the compound forms from its elements under standard conditions with the elements and the compound in their standard states.
Q：standard enthalpy change of atomisation
A：The enthalpy change when one mole of gaseous atoms is formed from the element under standard solutions.
Q：Standard enthalpy change of reaction
A：the energy transferred when the molar quantities of reactants stated react understandard conditions.
Q：Standard enthalpy change of neutralisation.
A：The enthalpy change when the amounts of acid and alkali in the equation for the reaction neutralise each other under standard conditions.
Q：Standard enthalpy change of combustion
A：The enthalpy change when one mole of the substance burns completely in oxygen under standard conditions.
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