writing and naming ionic compounds. atoms combine in simple whole number ratios to become more...
TRANSCRIPT
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WRITING AND NAMING
IONIC COMPOUNDS
WRITING AND NAMING
IONIC COMPOUNDS
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ATOMS COMBINE IN SIMPLE WHOLE NUMBER RATIOS TO BECOME MORE STABLE
THE SMALLEST UNIT OF ATOMIC COMBINATIONS
THAT RETAINS THE CHARACTERISTICS OF THE
COMPND IS A MOLECULE
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THE COMPOSITION OF A MOLE-CULE CAN BE REPRESENTED IN TWO WAYS AS AN EMPIRICAL OR A MOLECULAR FORMULA
AN EMPIRICAL FORMULA EXPRESSES THE SIMPLEST
RATIO OF ATOMS IN A COMPOUND
CH2
THE COMPOSITION OF A MOLE-CULE CAN BE REPRESENTED IN TWO WAYS AS AN EMPIRICAL OR A MOLECULAR FORMULA
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A MOLECULAR FORMULA TELLS HOW MANY OF
EACH ATOM ARE PRESENT IN THE COMPND
C3H6
THE COMPOSITION OF A MOLE-CULE CAN BE REPRESENTED IN TWO WAYS AS AN EMPIRICAL OR A MOLECULAR FORMULA
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A REMARKABLE FEATURE OF COMPOUNDS FORMED FROM ELEMENTS IS THAT THE PROPERTIES OF THE REACTANT ELEMENTS IS LOST
+
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WHEN AN ATOM LOSES OR GAINS ELECTRONS IN ORDER TO ACHIEVE ITS OCTET IT FORMS AN ION
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THERE ARE ALSO COMBINATIONS OF ATOMS THAT HAVE AN IONIC CHARGE A.K.A. POLYATOMIC IONS
POLY- MEANS MANY, BUT WE TREAT EACH OF
THESE POLYATOMIC IONS AS A SINGLE UNIT WITH A
SINGLE CHARGE
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TODAY IS ALL ABOUT COMBINING THESE ELECTRICALLY CHARGED IONS TOGETHER TO FORM STABLE COMPOUNDS.
REMINDER: WHEN TWO ATOMS COMBINE
TRANSFERRING VALENCE ELECTRONS IT IS CALLED
AN IONIC BOND.
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--
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- -
- -
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AN IMPERFECT ATOM
I WANTI WANTTO BETO BE
PERFECT!PERFECT!
I WANTI WANTTO BETO BE
PERFECT!PERFECT!
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IT COULD LOSE AN
ELECTRON!
--
---
-
- -
- -
++ -
WHAT DOES SODIUM NEED TO DO TO BECOME LIKE
NEON?
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--
WHAT DOES SODIUM NEED TO DO TO BECOME LIKE
NEON?
--
---
-
- -
- -
++ -
IT COULD LOSE AN
ELECTRON!
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WHAT DOES SODIUM NEED TO DO TO BECOME LIKE
NEON?
--
---
-
- -
- -
++
NOW SODIUMIS MORE STABLE!
11 p’s-10 e’s
+1 charge
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-- -
---
- -
- --
+
- -- -
--I WANTI WANT
TO BETO BEPERFECT!PERFECT!
I WANTI WANTTO BETO BE
PERFECT!PERFECT!
AN IMPERFECT ATOM
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IT COULD GAIN AN
ELECTRON!
-- -
---
- -
- --
+
- -- -
--
WHAT DOES Cl NEED TO DO TO BECOME LIKE A NOBLE GAS,
LIKE Ar?
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-IT COULD GAIN AN
ELECTRON!
-- -
---
- -
- --
+
- -- -
--
WHAT DOES Cl NEED TO DO TO BECOME LIKE A NOBLE GAS,
LIKE Ar?
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-- -
---
- -
- --
+
- -- -
---
IT COULD GAIN AN
ELECTRON!
WHAT DOES Cl NEED TO DO TO BECOME LIKE A NOBLE GAS,
LIKE Ar?17 p’s-18 e’s
-1 charge-1 charge
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SO WHAT’S THE BOTTOM LINE?
AN ATOM WILL SHARE, LOSE OR GAIN ENOUGH
ELECTRONS TO BECOME MORE STABLE WITH 8
ELECTRONS IN ITS OUTERMOST ENERGY LEVEL.
AND THEN IT WILL BOND WITH ANOTHER ATOM OF A
DIFFERENT ELEMENT.
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THINK ABOUT IT…FROM OUR PREVIOUS
EXAMPLE SODIUM HAD AN EXTRA ELECTRON AND GAVE IT
AWAY TO CHLORINE, WHICH WAS IN NEED OF ANOTHER
ELECTRON.THIS FORMED A BRAND NEW COMPOUND, NaCl IN WHICH
BOTH ELEMENTS WERE MORE STABLE
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-- -
---
- -
- --
+
- - -
---
-- -
---
- -
- -
+
-
AN ELECTRON IS TRANSFERRED FROM THE Na
ATOM TO THE Cl ATOM
AN ELECTRON IS TRANSFERRED FROM THE Na
ATOM TO THE Cl ATOM
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-- -
---
- -
- -
+ -- -
---
- -
- --
+
- --
---
-
BOTH ATOMS ARE HAPPY, THEY BOTH HAVE 8
ELECTRONS IN THEIR OUTERMOST ENERGY LEVEL. THIS
IS AN IONIC COMPOUND
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OPPOSITELY CHARGED IONS ATT-RACT EACH OTHER AND FORM AN IONIC BOND THAT IS ELECTRICALLY NEUTRAL,
LOOKING AT THE STRUCTURE OF SALT SHOWS THAT THE
ATTRACTION BETWEEN IONS IS SO GREAT THAT MANY
SODIUM AND CHLORIDE IONS BECOME INVOLVED
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THE SMALLEST STACK OF THESE ANIONS AND CATIONS
IS CALLED A UNIT CELL.
UNIT CELLS ARE STACKED TOGE-THER TO MAKE UP A CRYSTAL LATTICE.
CATIONS & ANIONS ARE PULLED TOGETHER IN A TIGHTLY PACKED STRUCTURE, WHICH GIVES IT A DISTINCTIVE STACKED SHAPE
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PROPERTIES OF IONIC COMPOUNDS
CAN CONDUCT
ELECTRICITY
WHEN MELTED IT FREES UP THE IONS TO MOVE PAST EACH OTHER
PACK IN HIGHLY
ORDERED ARRANGEME
NTS
IONS IN A SALT FORM
REPEATING PATTERNS CALLED A CRYSTAL LATTICE
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PROPERTIES OF IONIC COMPOUNDS
HARD
PACKED INTO LAYERS, TAKES A
LOT OF ENERGY TO BREAK ALL OF THE
BONDS
BRITTLE
IF A FORCE IS STRONG ENOUGH TO REPOS-ITION A LAYER THEN THE
REPULSIVE FORCES DRIVE IONS APART
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PROPERTIES OF IONIC COMPOUNDS
HIGH MELTING
POINTS AND BOILING POINTS
BECAUSE OF STRONG ATTRA-CTION BETWEEN IONS, IT TAKES A LOT OF ENERGY TO BREAK THEM
APART
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WE CAN PREDICT THE COMBINATIONS OF IONS AND THE FORMATION OF THEIR IONIC FORMULAS,
KNOWING HOW IONS INTERACT
PREDICTING THE FORMATION OF IONIC CMPNDS
WE CAN HAVE 2 DIFFERENT KINDS OF IONIC COMPOUNDS FORMED: BINARY OR TERNARY
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THERE ARE A COUPLE OF RULES TO FOLLOW TO MAKE SURE THAT THE
PROPER IONIC FORMULA IS WRITTEN.
WRITING IONIC FORMULAS
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RULE #1 IONS WILL COMBINE IN SMALL WHOLE NUMBER
RATIOS THAT ADD TO GIVE A NEUTRAL COMPOUND.
THE IONS’ CHARGES MUST ADD UP TO ZERO
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IT’S BETTER TO BE POSITIVE THAN
NEGATIVETHE POSITIVE ION IS ALWAYS WRITTEN
FIRST.
RULE #2
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SOME IONIC COMPNDS AUTOMATICALLY HAVE
CHARGES THAT ADD UP TO ZERO.
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WHAT IF WE WERE FORMING IONIC
COMPOUNDS WITH IONS WHOSE CHARGES DIDN’T ADD UP TO A CHARGE OF
EXACTLY 0?HOW DO WE DECIDE THE
RATIO OF THE IONS?
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WHAT IF WE HAD THREE CHLORINE IONS?
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IT WILL TAKE 3 Cl-1 IONS TO EQUAL ONE Al+3 ION.
WE HAVE A TRICK THAT WILL HELP US KNOW THE NUMBER OF THE
IONS TO MAKE A NEUTRAL COMPOUND.IT’S NOT A TRICK SO MUCH AS A SHORTCUT!
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CRISS-CROSS RULE:
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TO WRITE THE FORMULAS FOR COMPOUNDS
CONTAINING POLYATOMIC IONS, FOLLOW THE RULES FOR WRITING FORMULAS
FOR BINARY COMPOUNDS, WITH ONE EXTRA CONSIDERATION.
USING POLYATOMIC IONS
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WRITE PARENTHESES AROUND THE GROUP REPRESENTING THE
POLYATOMIC ION WHEN MORE THAN ONE OF THE
ION IS NEEDED TO DEVELOP THE PROPER
RATIO.
USING POLYATOMIC IONS
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MOST OF THE TIME YOU CAN NAME AN IONIC COMPOUND BY
1) WRITING THE NAME OF THE FIRST ELEMENT
2) WRITING THE ROOT OF THE NAME OF THE SECOND ELEMENT
3) ADDING -IDE TO THE ROOT
NAMING THEM
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NAMES OF NEGATIVE IONSPARENT ELEMENTPARENT ELEMENT NEGATIVE IONNEGATIVE ION
CHLORINECHLORINE CHLORIDECHLORIDE
OXYGENOXYGEN OXIDEOXIDE
NITROGENNITROGEN NITRIDENITRIDE
PHOSPHORUSPHOSPHORUS PHOSPHIDEPHOSPHIDE
FLUORINEFLUORINE FLUORIDEFLUORIDE
IODINEIODINE IODIDEIODIDE
SULFURSULFUR SULFIDESULFIDE
BROMINEBROMINE BROMIDEBROMIDE
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NAMING THEMCaCl2
K3P
Al2S3
Calcium chloride
Potassium phosphide
Aluminum sulfide
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SOME OF OUR METALS HAVE MORE THAN ONE IONIC CHARGE1) WE HAVE TO FIGURE OUT WHICH CHARGE THE METAL HAS2) THEN WE DESIGNATE THAT PARTICULAR METAL WITH A ROMAN NUMERAL
NAMING THEM
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FeCl2
FeCl3
PbBr2
Iron(II) chloride
Iron (III) chloride
Lead (II) bromide
NAMING THEM
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IF THE COMPOUND HAS A POLYATOMIC ION IN IT1) NAME THE FIRST ELEMENT2) THEN NAME THE POLYATOMIC ION
NAMING THEM
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Fe(OH)2
Ca3 (PO4)2
Na2SO4
Iron(II) hydroxide
Calcium phosphate
Sodium sulfate
NAMING THEM
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BONDING & BOND ENERGIES THERE IS A LARGE AMOUNT
OF ENERGY STORED IN THE BONDS OF AN IONIC COMPOUND (INDICATION OF STABILITY).THEREFORE, IT TAKES A
LOT OF ENERGY TO PULL THE TWO IONS APART
ONCE THEY HAVE ESTABLISHED THEIR
OCTETS AND HAVE BONDED (BOND ENERGY)
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THIS LATTICE ENERGY GIVES US A METHOD OF MEASURING THE BOND STRENGTH IN IONIC COMPOUNDS.
THE LATTICE ENERGY IS THE ENERGY RELEASED TO
FORM A BOND, AND IS EXACTLY EQUAL TO THE
BOND ENERGY, WHICH IS THE ENERGY TO BREAK A
BOND.