Writing Chemical Formulas
Presentation
•
Chemistry
•
12th Grade
•
Practice Problem
•
Easy
NAUDIA LAWRENCE
Used 12+ times
FREE Resource
35 Slides • 8 Questions
1
By NAUDIA LAWRENCE
2
I can write a Chemical Formula given the Chemical name of a compound.
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At the end of the lesson you should be able to write a chemical Formula when you are given the name of a compound
4
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5
After bonding together, there is no charge. The compound is neutral.
6
Two ions combine to form a neutral compound.
7
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8
Before we learn the steps for writing a formula lets review how to find the charge or oxidation number of an element
Some text here about the topic of discussion.
Lets Review Key concepts
9
Multiple Choice
What is the oxidation number of the elements in Group 1 of the periodic table
-1
+1
-2
-3
10
Multiple Choice
What is the oxidation number of the ION in Group 15 of the periodic table
+2
+4
-2
-3
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Multiple Choice
What is the oxidation number of the elements in Group 13 of the periodic table
-2
+3
0
-3
12
Multiple Choice
What is the oxidation number of Neon in Group 18 of the periodic table
-2
0
+3
-3
13
Multiple Choice
Some ions have more than one elements and cannot be found on the periodic table. Using your reference tables determine the chatge of a Cyanide (CN) ion
+4
-2
+1
-1
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Table E shows the IONS that have more than 1 Elements in them.
The CYANIDE ION has the elements Carbon and Nitrogen in it.
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We muust also know how to write formulas for Trabsition metals
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What do the numbers in parentheses mean in the chemical names above
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The roman numeral in paretheses tells us which ion is present in that compound
Iron Has 2 Oxidation Numbers
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What do the numbers in parentheses mean in the chemical names above
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20
Multiple Choice
What is the oxidation number of Nickel in Nickel (III) Chloride?
+1
+6
+7
+4
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Multiple Choice
What is the oxidation number of Chromium in Chromium (VI) Oxide?
+1
+6
+7
+4
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Multiple Choice
What is the oxidation number of Manganese in Manganese (IV) Oxide?
+1
+6
+7
+4
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I will then give you notes on these step to use in your examples
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First, Write the symbol for the Metal and the Non-metal. The Non Metal ALWAYS ends with "IDE"
Write the Formula for Magnesium Choride.
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Determine the charges on the Metal and the non-metal. If there is a Roman numeral after the metal that is the number of the charge
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Criss-Cross the charges. The number from the charge of the metal goed below the non-metal and the number of the charge of thenon-metal goes below the metal as a subscript.
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Write the Symbols and charge
Criss cross charges
Do not write 1s
Do not write the same numbers
Oxide
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Write the Symbols and charge
Criss cross charges
Do not write 1s
Do not write the same numbers
Oxide
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Write the Symbols and charge
Criss cross charges
Do not write 1s
Do not write the same numbers
32
Write the Symbols and charge
Criss cross charges
Do not write 1s
Do not write the same numbers
33
Write the Symbols and charge
Criss cross charges
Do not write 1s
Do not write the same numbers
34
Write the Symbols and charge
Criss cross charges
Do not write 1s
Do not write the same numbers
35
Write the Symbols and charge
Criss cross charges
Do not write 1s
Do not write the same numbers
36
Write the Symbols and charge
Criss cross charges
Do not write 1s
Do not write the same numbers
37
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Write the symbol for the Metal and the Non-metal
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STEP 2
Determine the charges on the Metal and the non-metal. If there is a Roman numeral after the metal that is the number of the charge
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Criss-Cross the charges. The number from the charge of the metal goed below the non-metal and the number of the charge of thenon-metal goes below the metal as a subscript. The + and - dont move
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Use Parentheses to separate the numbers in the chrge and the ion
43
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