Warm Up What is the charge of a cation? negative or positive How are cations formed? What is the...
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![Page 1: Warm Up What is the charge of a cation? negative or positive How are cations formed? What is the charge of an anion? negative or positive How are anions.](https://reader036.fdocuments.us/reader036/viewer/2022062518/5697bf861a28abf838c88333/html5/thumbnails/1.jpg)
Warm Up
• What is the charge of a cation? negative or positive
• How are cations formed?
• What is the charge of an anion? negative or positive
• How are anions formed?
![Page 2: Warm Up What is the charge of a cation? negative or positive How are cations formed? What is the charge of an anion? negative or positive How are anions.](https://reader036.fdocuments.us/reader036/viewer/2022062518/5697bf861a28abf838c88333/html5/thumbnails/2.jpg)
State the number of electrons gained or lost in forming the following ions:
Mg2+
Rb1+
Br-
Al3+
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State the number of electrons gained or lost in forming the following ions:
Mg2+ Lost 2 electronsRb1+ Lost 1 electronsBr- Gained 1 electronAl3+ Lost 3 electrons
![Page 4: Warm Up What is the charge of a cation? negative or positive How are cations formed? What is the charge of an anion? negative or positive How are anions.](https://reader036.fdocuments.us/reader036/viewer/2022062518/5697bf861a28abf838c88333/html5/thumbnails/4.jpg)
Write the formula unit (element symbol and charge) for the following ions:
• Sodium ion• Bromide• Sulfide• Barium ion
![Page 5: Warm Up What is the charge of a cation? negative or positive How are cations formed? What is the charge of an anion? negative or positive How are anions.](https://reader036.fdocuments.us/reader036/viewer/2022062518/5697bf861a28abf838c88333/html5/thumbnails/5.jpg)
Write the formula unit (element symbol and charge) for the following ions:
• Sodium ion Na+
• Bromide Br-
• Sulfide S2-
• Barium ion Ba2+
![Page 6: Warm Up What is the charge of a cation? negative or positive How are cations formed? What is the charge of an anion? negative or positive How are anions.](https://reader036.fdocuments.us/reader036/viewer/2022062518/5697bf861a28abf838c88333/html5/thumbnails/6.jpg)
6.4Writing Chemical FormulasWriting Chemical Formulas
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Binary Ionic compounds (2 elements)
Chemical Formula Rule: 1. Identify ion symbols and charges2.Write cation symbol 1st followed by the anion
symbol3. Balance charge (“cross multiplication”)Example: Write the formula for sodium chloride.
Na+ and Cl-
NaCl
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Na+ O2-
Formula: Na2O
Na+ Na+ O2-
*** You do not need to write a 1, if the subscript is not present you assume it is one!!
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Trick for balancing
“cross multiply”Ca2+ Cl-
Ca Cl2
Ca2+ Cl- Cl-
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Naming the ionic compound when given a formula
1. Cation full name followed by the anion(-ide ending)
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Naming: Cation + anion-ide
Example: • CaCl2 Calcium chloride
• NaCl Sodium Chloride
When looking at the name, is the number of atoms indicated?
How are you supposed to figure out the number of atoms???
![Page 12: Warm Up What is the charge of a cation? negative or positive How are cations formed? What is the charge of an anion? negative or positive How are anions.](https://reader036.fdocuments.us/reader036/viewer/2022062518/5697bf861a28abf838c88333/html5/thumbnails/12.jpg)
You try it!
Li+ S2-
Write the formula and name!
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You try it!
Li+ S2-
Write the formula and name!
Li2S
Lithium Sulfide
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The ions of calcium and sulfur form a binary ionic compound.
Write the formula and name of this resulting compound:
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Calcium ion and Sulfide
Write the formula and name of this resulting compound:
CaSCalcium sulfide
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You try it!
Write the ions, chemical formula and chemical name of the ionic compound formed when potassium and oxygen ions interact.
Ions: Chemical Formula:Chemical name:
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Write the ions, chemical formula and chemical name of the ionic compound formed when potassium and oxygen ions interact.
Ions: K+ O2-
Chemical Formula: K2O
Chemical Name: Potassium oxide
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Ternary Compounds
one ion is monatomic other is a polyatomic ion…….
Example: Lead NitratePb2+ and ( NO3
- )
Formula: Pb (NO3)2
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You try it!
Sodium hydrogen phosphateNa1+ HPO4
2-
Write the formula:
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Sodium hydrogen phosphateNa1+ HPO4
2-
Write the formula:Na2HPO4
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6.3 and 6.4In Class Practice