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- Criss Cross Method
Course
Physical Chemistry I (CHEM 33000)
34 Documents
Students shared 34 documents in this course
University
The City College of New York
Academic year: 2020/2021
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The criss-cross method of balancing charge!
Ionic compound formulas must contain the fewest number of ions that “balance” out positive and negative charge (the same amount of each). The “criss-cross” method is one way of writing the formulas properly. The formula for ionic compounds is called a “formula unit.”
- Write symbols and charges of ions. Cu2+ , P3-
- Crisscross: Cu2+ 3 , P3 - 2 The cation charge becomes the anion subscript The anion charge becomes the cation subscript
- Clean up format for final answer
- do NOT write ionic charges
- reduce subscripts to lowest ratio
- do NOT write the subscript “1” Cu 3 P 2
Use the criss-cross method to write formula units for these ionic compounds (2 examples are done for you)
Cl- O2- P3- S2-
Na+ NaCl Na 2 O Na 3 P Na 2 S
K + KCL K 2 O K 3 P K 2 S
Ba2+ BaCl 2 BaO Ba 3 P 2 BaS
Fe2+ FeCl 2 FeO Fe 3 P 2 FeS
Cr3+ CrCl 3 Cr 2 O 3 CrP Cr 2 S 3
Li+ LiCl Li 2 O Li 3 P Li 2 S
Mg2+ MgCl 2 MgO Mg 3 P 2 MgS
Al3+ AlCl 3 Al 2 O 3 AlP Al 2 S 3
Ga3+ GaCl 3 Ga 2 O 3 GaP Ga 2 S 3
Sn2+ SnCl 2 SnO Sn 3 P 2 SnS
Ca2+ CaCl 2 CaO Ca 3 P 2 CaS
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- Criss Cross Method
Course: Physical Chemistry I (CHEM 33000)
34 Documents
Students shared 34 documents in this course
University: The City College of New York
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The criss-cross method of balancing charge!
Ionic compound formulas must contain the fewest number of ions that “balance” out positive
and negative charge (the same amount of each). The “criss-cross” method is one way of
writing the formulas properly. The formula for ionic compounds is called a “formula unit.”
1. Write symbols and charges of ions. Cu2+ , P3-
2. Crisscross: Cu2+ 3 , P3 -2
The cation charge becomes the anion subscript
The anion charge becomes the cation subscript
3. Clean up format for final answer
-do NOT write ionic charges
-reduce subscripts to lowest ratio
-do NOT write the subscript “1” Cu3P2
Use the criss-cross method to write formula units for these ionic compounds
(2 examples are done for you)
Cl-O2- P3- S2-
Na+NaCl Na2ONa3P Na2S
K +KCL K2O K3P K2S
Ba2+ BaCl2BaO Ba3P2BaS
Fe2+ FeCl2FeO Fe3P2FeS
Cr3+ CrCl3Cr2O3CrP Cr2S3
Li+LiCl Li2O Li3P Li2S
Mg2+ MgCl2MgO Mg3P2MgS
Al3+ AlCl3Al2O3AlP Al2S3
Ga3+ GaCl3Ga2O3GaP Ga2S3
Sn2+ SnCl2SnO Sn3P2SnS
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