Summary A-Level Chemistry Notes (A2) CAIE

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(9701) syllabus.



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, ∆𝑯 ⊖
𝒍𝒂𝒕𝒕 ∆𝑯 ⊖
𝒉𝒚𝒅 ∆𝑯 ⊖
𝒔𝒐𝒍 ∆𝑯 ⊖
𝒂𝒕
𝑵𝒂+ (𝒈) + 𝑪𝒍− (𝒈) → 𝑵𝒂𝑪𝒍(𝒔) 𝑪𝒍− (𝒈) + 𝒂𝒒 → 𝑪𝒍− (𝒂𝒒) 𝑴𝒈𝑪𝒍𝟐 (𝒔) + 𝒂𝒒 ⟶ 𝑴𝒈𝑪𝒍𝟐 (𝒂𝒒)
ALWAYS EXO Enthalpy change
WHEN ONE MOLE


AN IONIC A GASEOUS
IONIC SOLID
COMPOUND ION


∆𝑯 ⊖
𝒍𝒂𝒕𝒕 ∆𝑯 ⊖
𝒔𝒐𝒍

↓ ↑

↑ charge density (CD)
↑ STRONGER IONIC
BOND
More exo (more negative) for smaller size ions &
larger charge




THASA RATHA 1

, 𝚫𝐇𝑬𝑨𝟏




1. ENTHALPY CHANGE
2. when
3. 1 mol of e is added to




𝑬𝑨𝟏 is always exothermic Successive EA is endothermic




IN ONE MOLE
ONE MOLE

𝐸𝐴1 ATTRACTION BETWEEN THE
INCOMING E & NUCLEUS
𝑬𝑨𝟏


THASA RATHA 2