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Transcript 
Chemical formula: the use of
subscripts
 Ionic compound:
 Formula tells us ratio of the elements
• NaCl (Na:Cl = 1:1)
• CaCl2 (Ca:Cl = 1:2)
 Covalent compound:
 Formula tells us number of atoms in molecule
• C12H22O11 – 12 C atoms, 22 H atoms, 11 O atoms
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