ionic/covalent compounds characteristics & counting atoms/molecules
TRANSCRIPT
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Ionic/Covalent Compounds Characteristics
& Counting Atoms/Molecules
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Ionic Compounds
• We already learned that ionic compounds are formed from 1 atom on the left and 1 atom on the right of the staircase on the Periodic Table getting together.
• Hundreds of compounds contain ionic bonds
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Ionic compounds
• If ionic bonds occur between metals and oxygen, oxides form.
• Most other ionic compounds are called salts.
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Ionic Compounds
• Many ionic compounds are binary (have 2 elements only)
• Binary compounds = 1 cation (positive ion) and 1 anion (negative ion)
• Cation = Loses electron• Anion = Gains electron
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Example
• CaF2 = (Calcium = +2 charge ………………. (+2)
• (Fluoride = -1 charge …..-1 +-1 … (-2) Net: 0
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Ionic compounds
• Form repeating patterns that form an ionic crystal….called a lattice crystal. (the cube)
• NaCl (Salt) is what shape under a microscope?
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Ionic bonds
• Ionic bonds = Very strong…….hard to break….takes a lot of energy to break them.
• Ionic bonds = high melting points and high boiling points because it is hard to break the bonds and bonds must be broken to melt and to boil…….
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Ionic Compounds
• In solid state….they are nonconductors of electricity…..because ions are fixed in solids and can’t move
• When dissolved into liquid…….electricity will go through them…..because ions are free to move……these liquids are called electrolytes
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Counting Atoms and Molecules
• 2NaCl
• How many Na atoms?• How many Chlorine atoms?• How many NaCl compounds?
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Counting Atoms and Molecules
• 2NaCl
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Counting Atoms and Molecules
• 2NaCl
• How many NaCl compounds? 2 • How many Na atoms? • How many Chlorine atoms?
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Counting Atoms and Molecules
• 2NaCl
• How many NaCl compounds? 2• How many Na atoms? 2• How many Chlorine atoms?
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Counting Atoms and Molecules
• 2NaCl
• How many NaCl compounds? 2• How many Na atoms? 2• How many Chlorine atoms? 2
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Guided Practice #1
• 3 CO2
• How many carbon atoms?• How many oxygen atoms?• How many molecules of CO2?
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Guided Practice #1
• 3 CO2
• How many molecules of CO2? 3
• How many carbon atoms? • How many oxygen atoms?
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Guided Practice #1
• 3 CO2
• How many molecules of CO2? 3
• How many carbon atoms? • How many oxygen atoms?
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Guided Practice #1
• 3 CO2
• How many molecules of CO2? 3
• How many carbon atoms? 3• How many oxygen atoms?
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Guided Practice #1
• 3 CO2
• How many molecules of CO2? 3
• How many carbon atoms? 3• How many oxygen atoms? 6
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Guided Practice #2
• Ionic compounds have ____________ melting points and ____________ boiling points.
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Guided Practice #2
• Ionic compounds have HIGH melting points and HIGH boiling points.
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Guided Practice 3#
• 5 KBr
• How many molecules of KBr= • How many K atoms= • How many Br atoms =
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Guided Practice #3
• 5 KBr
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Guided Practice #3
• 5 KBr
• How many molecules of KBr= 5 • How many K atoms= • How many Br atoms =
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Guided Practice #3
• 5 KBr
• How many molecules of KBr= 5 • How many K atoms= • How many Br atoms =
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Guided Practice #3
• 5 KBr
• How many molecules of KBr= 5 • How many K atoms= 5 • How many Br atoms =
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Guided Practice #3
• 5 KBr
• How many molecules of KBr= 5 • How many K atoms= 5 • How many Br atoms = 5
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Guided Practice #4
• Oxides are formed when metals come together with _______________.
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Guided Practice #4
• Oxides are formed when metals come together with Oxygen.
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Independent Practice
• Now it is your turn…..feel free to ask any questions whenever you are confused.