Formulae and Equations (OCR A-Level Chemistry A): Flashcards

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Ion type formed by metals

Cations (positive ions)

Charge on Group 2 metal ions

2+

Charge on Group 6 non-metal ions

2-

Charge on silver ion

Ag+\text{Ag}^{+}

Formula of ammonium ion

NH4+\text{NH}_{4}^{+}

Formula of carbonate ion

CO32−\text{CO}_{3}^{2-}

Charge rule for ionic compounds

Sum of positive = sum of negative; overall zero

Mnemonic for diatomic elements

BrINClHOF

When to use brackets in formulae

Multiple polyatomic ions present

Critical rule balancing equations

Never change chemical formulae/subscripts

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Atoms, Ions and Compounds

Amount of Substance

Acids and Redox

Electrons and Bonding

Shapes of Molecules and Intermolecular Forces

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Electrons and Bonding

Shapes of Molecules and Intermolecular Forces

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