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Describing Chemical Reactions Chemical Formulae:.

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Presentation on theme: "Describing Chemical Reactions Chemical Formulae:."— Presentation transcript:

1 Describing Chemical Reactions Chemical Formulae:

2 Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms e.g. H 2 O

3 Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms e.g. H 2 O2 hydrogen 1 oxygen

4 Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms e.g. H 2 O2 hydrogen 1 oxygen *if no suffix, only one atom is present

5 Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms 2. suffix after brackets multiplies every atom within the brackets e.g. Ca(ClO 3 ) 2

6 Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms 2. suffix after brackets multiplies every atom within the brackets e.g. Ca(ClO 3 ) 2 1 calcium

7 Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms 2. suffix after brackets multiplies every atom within the brackets e.g. Ca(ClO 3 ) 2 1 calcium 2 chlorine

8 Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms 2. suffix after brackets multiplies every atom within the brackets e.g. Ca(ClO 3 ) 2 1 calcium 2 chlorine 6 oxygen

9 Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms 2. suffix after brackets multiplies every atom within the brackets 3. prefix indicates the # of molecules e.g. H 2 O vs 3H 2 O

10 Describing Chemical Reactions Chemical Formulae: 1. suffix indicates the # of atoms 2. suffix after brackets multiplies every atom within the brackets 3. prefix indicates the # of molecules e.g. H 2 O vs 3H 2 O # hydrogen: 26 # oxygen: 13

11 Describing Chemical Reactions try these: MoleculeElements in the molecule # atoms of each element MgCl 2 NH 4 OH Al 2 (SO 4 ) 3 3 Ca 2 C 2 (NH 4 ) 3 PO 4

12 Describing Chemical Reactions try these: MoleculeElements in the molecule # atoms of each element MgCl 2 magnesium1 chlorine2

13 Describing Chemical Reactions try these: MoleculeElements in the molecule # atoms of each element NH 4 OHnitrogen1 hydrogen5 oxygen1

14 Describing Chemical Reactions try these: MoleculeElements in the molecule # atoms of each element Al 2 (SO 4 ) 3 aluminum2 sulfur3 oxygen12

15 Describing Chemical Reactions try these: MoleculeElements in the molecule # atoms of each element 3 Ca 2 Ccalcium6 carbon3

16 Describing Chemical Reactions try these: MoleculeElements in the molecule # atoms of each element 2 (NH 4 ) 3 PO 4 nitrogen6 hydrogen24 phosphorus2 oxgyen8

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