Types, Naming & Explaining COMPOUNDS. Learning Goals I CAN EXPLAIN THE PROPERTIES OF IONIC &...
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Transcript of Types, Naming & Explaining COMPOUNDS. Learning Goals I CAN EXPLAIN THE PROPERTIES OF IONIC &...
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Types, Naming & Explaining
COMPOUNDS
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Learning Goals
• I CAN EXPLAIN THE PROPERTIES OF IONIC & MOLECULAR COMPOUNDS.
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BACKGROUND INFORMATION
DO NOT COPY DOWN THE FOLLOWING
SLIDES
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The millions of types of compounds that have been discovered and described can be categorized as one of two types: IonicMolecular
TYPES OF COMPOUNDS
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Composed of at least one metal and one nonmetal.Most share the following properties:
High melting points Form crystals, very regular arrangements of particles Dissolve in water to form solutions that conduct
electricity Solids at room temperature
Example: NaCl (salt)
IONIC COMPOUNDS
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The transfer of electrons from the metal to the nonmetal.
Causes metal to form positive ion and nonmetal to form negative ion.
Opposites attract and they arrange themselves in an alternating pattern called a crystal arrangement.
HOW DO IONIC COMPOUNDS FORM?
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IONIC COMPOUNDS
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When two or more non-metals combine together.Atoms SHARE electrons to obtain stability.Example: Sugar (C12H22O11)Share the following properties:
Can be solids, liquids or gases Usually good insulators but poor conductors Have relatively low boiling points
MOLECULAR COMPOUNDS
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NAMING COMPOUNDS
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Step #1
Step #2
Step #2Step #3Naming Step #1
Step #4Naming Step #1
Step #3Naming Step #1
Step #4Naming Step #2
Yes
No
Step #5Naming Step #3
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Is the first element a metal?
QUESTION
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It’s made up of a metal and a non-metal.
Example: CaCl2
Name: __________ _________
IT’S AN IONIC COMPOUND
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Write down the name of the element that is the METAL (the first element in the formula)
Example: CaCl2
Name: Calcium _________
NAMING STEP #1
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Name the non-metal element second. The ending of its name changes to “ide”
Example: CaCl2
Name: Calcium Chloride
NAMING STEP #2
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It’s made up of two non-metals
Example: N2O5
Name: __ ________ __ _______
IT’S AN MOLECULAR COMPOUND
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Write down the name of the first element.
Example: N2O5
Name: __nitrogen __ _______
NAMING STEP #1
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Name the second element. The ending of its name changes to “ide”
Example: N2O5
Name: __nitrogen __oxide
NAMING STEP #2
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Add prefixes indicating the number of atoms of each element.
Example: N2O5
Name: dinitrogen pentaoxide
NAMING STEP #3
Prefixes You Need to Know:
Mono = 1 Di = 2Tri = 3 Tetra = 4Penta = 5 Hexa = 6Hepta = 7 Octa = 8
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NOW THE FORMULAS!!
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The Question
Molecular Compound Step #1
Molecular CompoundStep #2
Yes
No
Ionic Compoun
d
MolecularCompoun
d
Ionic CompoundStep #1
Ionic CompoundStep #3a
Ionic CompoundStep #2a
Ionic CompoundStep #2b
Ionic CompoundStep #3b
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Is the first element a metal?
QUESTION
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Identify the ions and their charges.
Example: aluminum oxide 3+ 2- Rough work: Al O
IONIC COMPOUNDS STEP #1
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IONIC COMPOUNDS STEP #2A
Picture the charges sitting on a teeter-totter. How many of each atom would you need to balance out each side?
Example: aluminum oxide
3+ 2- Rough work: Al O
Al3+
Al3+
Al3+Al3+
Al3+Al3+
O2-
O2-O2-
O2-
O2-O2-
O2-O2-
Total = 2 atoms 3 atoms
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IONIC COMPOUNDS #3A
Write the final of ratio of atoms in the element.
Example: aluminum oxide
Answer: Al2O3
Al3+Al3+ O2-O2-O2-
Total = 2 atoms 3 atoms
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Write the symbols for each of the elements in the compound.
Example: nitrogen trifluoride
Formula: N F
MOLECULAR COMPOUND CHEMICAL FORMULAS: PART #1
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Write the subscript to indicate the number of atoms based on the prefix. Do not write the number 1.
Example: nitrogen trifluoride
Formula: N F3
MOLECULAR COMPOUND CHEMICAL FORMULAS: PART #2
Prefixes You Need to Know:
Mono = 1 Di = 2Tri = 3 Tetra = 4Penta = 5 Hexa = 6Hepta = 7 Octa = 8