Amphoteric Oxides
The Double Agent of Chemistry
🕵️ The Double Agent Scenario
Imagine a spy who can blend into any environment. Drop them into an acidic territory — they act like a base. Drop them into an alkaline territory — they flip their badge and act like an acid. Most oxides are one-trick ponies. Amphoteric oxides are chameleons — they survive in both hostile environments by adapting.
📖 Build the Definition
Click each part to reveal the complete Cambridge definition of an amphoteric oxide:
🧠 Lock In the Two Examples
The Cambridge syllabus requires you to memorise EXACTLY these two. Click each to lock them in:
⚗️ The Reaction Tester Lab
Step 1: Select an oxide. Step 2: Apply a reagent. Observe what happens.
Step 1 — Select an Oxide:
📝 The Four Equations to Know
Amphoteric oxides have two sets of equations — one for acid, one for alkali. Master both.
ZnO + Acid:
ZnO + Alkali:
Product = sodium zincate (a soluble salt)
Al₂O₃ + Acid:
Al₂O₃ + Alkali:
Product = sodium aluminate (a soluble salt)
⚠️ Examiner's Traps
The Chameleon Rule
An amphoteric oxide is the chameleon of inorganic chemistry. In an acidic environment it behaves as a base. In an alkaline environment it behaves as an acid. The only two you need are Al₂O₃ and ZnO.
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