forming & naming - weebly
TRANSCRIPT
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FORMING
Day 1 - ionic
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THE ATOM
▪Protons (+)
▪Neutrons (0)
▪Electrons (-)▪Notice the size
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VALENCE ELECTRONS
(ELECTRONS ON THE OUTER LAST “SHELL” RING)
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WHY ARE VALENCE ELECTRONS IMPORTANT?
•They determine a majority of the reactions that
we see in daily life
• Atoms will steal or share valence electrons to
have a full valence shell like a noble gas ( “stable”
and “unreactive”)
•Octet rule (Full valence shell): atoms would like
to have 8 valence electrons to become stable
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DO YOU GET IT?
Using your periodic table, find out how many valence electrons each of the following has:
Element Group NumberValence Electron
Number
How many e- to be
stable
(full valence shell) ?
Magnesium (Mg)
Silicon (Si)
Chlorine (Cl) 17 7 1
Iodine (I)
Calcium (Ca)
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FUNDAMENTALS OF CHEMICAL BONDING• What is a chemical bond?
attraction between atoms that allows for the formation of compounds
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WHAT ARE IONS?
A charged atom that results from it losing or gaining an electron
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Once the electron is lost / gained (respectively), these atoms become IONS
CATION
+
(lose)
ANION
-
(gain)
WHAT ARE IONS?
A charged atom that results from it losing or gaining an electron
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❑Elements in groups 1, 2, and 3 will form cations (lose
electrons).
❑Elements in GROUP 4 can form both cations and
anions depending on its partner element.
❑Elements in groups 5, 6, or 7 will form anions (gain
electrons).
❑What about group 8?
OXIDATION NUMBERS
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CFU: DO YOU GET IT?
ElementWhat will it form?
Cation or AnionIon Symbol
F
K
Al
N
Anion
Cation
Cation
Anion
F-
K+
Al3+
N3-
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IONIC BONDING• An Ionic Bond is a chemical bond formed
when one atom gains and another loses valence electrons then bond together to become stable (have a full valence shell).
• Ionic bonds form between metals and non-metals ONLY
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LEWIS DOT DIAGRAM
• Valence electrons can be easily represented through a Lewis Dot Diagram
• Model that represents only the valence shell electrons of an element.
P
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EXAMPLE 1: SODIUM (Na) AND CHLORIDE (Cl)
Na Cl Na Cl NaCl
1. Lewis Dot Diagram
2. Draw electron transfer arrows3. Determine the cation and anion 4. Write out the end result
FORMING IONIC COMPOUNDS
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EXAMPLE 2: ALUMINUM (Al) AND PHOSPHORUS (P)
Al + P
Forming Ionic bonds can be straightforward
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Al + P Al3+ P3-
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Li + O
EXAMPLE 3: LITHIUM (Li) AND OXYGEN (O)
Forming Ionic bonds may NOT be straightforward
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Li + O
Oxygen’s Valence shell is not full. Any ideas
about what we could do?
Add another Lithium to the equation!
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Li + O
Li
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Li + O
Li
Li 1+ O2-
The #2 below an
element indicates that
you used 2 of them
Li2 O
Li 1+
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FORMING
Day 2 - covalent
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IONIC BONDS
Cation(s) Anion Li2 OLi +1
Li +1
O -2
(one headed arrow represents TRANSFER)
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COVALENT BOND PRACTICE CO 2
• STEP 1: Draw the Lewis Dot Diagram of each element
C OO
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COVALENT BOND PRACTICE CO 2
• STEP 2: Show the sharing of electrons by drawing double-headed arrows
C OO
(double headed arrow represents SHARING)
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COVALENT BOND PRACTICE CO 2
• STEP 3: Draw the Lewis Dot Structure to make sure all elements satisfy
the Octet Rule (show multiple bonds if necessary)
O C OEach line represents
2 e- being shared
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DIATOMIC ATOMS
Pure elements that form molecules consisting of two atoms bonded together
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CFU WHICH WILL FORM AN IONIC BOND? WHICH WOULD FORM A COVALENT BOND?
What type of bonds will form:
Ionic or Covalent
Nitrogen and Oxygen
Carbon and Sulfur
Sodium and Fluorine
Lithium and Aluminum
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DIOXIDE – O2
dioxide
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AMMONIA - NH3
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METHANE - CH4
methane
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FORMING & NAMING
Type 1 & 2 IONIC
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Includes: metal & non-metal
Naming Rules:
1. The metal ion's name does not change regardless of charge
2. The non-metal's name ends in -ide.
For example: AlCl3 = aluminum chloride
Na2S = sodium sulfide
K2O = potassium oxide
MgH2 = magnesium hydride
Notice how the little numbers (subscripts) do not affect the way we name them.
Ionic Type 1 (metal only has one charge)
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IONIC TYPE 1: FORMULA
Here, we have to consider the common charges for calcium and phosphorus, which are +2 and -3,
respectively. Calcium, if you recall, typically loses two electrons to get a noble gas electron arrangement,
and phosphorus needs three more electrons.
Ca+2 and P-3
So the answer is Ca3P2.
• Other examples: potassium oxide : K+1 and O-2 yields K2O
aluminum bromide: Al+3 and Br-1 yields AlBr3.
Work space
If necessary!
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CFU
Example Formula Name
H + Cl
Li + Br
Mg + Si
Rb + P
Mg + O
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Includes: transition metal & non-metal
Naming Rules:
1. Transition metal goes first
2. Use roman numerals to specify the metals charge
3. The non-metal's name ends in ide.
For example:
• FeO → Fe + O →
• Fe2O3 → Fe + O →
• To go backwards, we need to figure out the charge of the transition metal.
• Name it by writing the metal first, its charge in roman numerals, then the non-metal with the suffix -ide
Ionic Type 2 (metal only has two charges)
2-?Iron (11) Oxide
? 2-Iron (1I1) Oxide
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IONIC TYPE 2: FORMULA
If necessary!
Work space
• Iron (II) Oxide
• Iron (III) Oxide
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CFU
Example Formula Name
Iron (II) Sulfide
Cobalt (II) Nitride
Tin (IV) Oxide
Manganese (II)
Sulfide
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FORMING & NAMING
Covalent and polyatomic
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Includes: non-metal & non-metal
Naming Rules:
1. Name the element furthest left first
2. Write the name of the second non-metal ending in -ide
3. Use prefixes to specify how many of each element
For example:
• CO – moncarbon monoxide
• CO2 – carbon dioxide
• P2O3 – ?
• The only time we drop a prefix is if the mono is to appear at the beginning of the name.
CovalentPrefix Number of atoms
mono 1
di 2
tri 3
tetra 4
penta 5
hexa 6
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COVALENT: FORMULA
• Write the formula based on the name:
• Carbon tetrachloride – CCl4
• diatomic oxygen – ?
• H2O – ?
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Includes: compound & non-metal OR metal
Naming Rules:
1. Name the cation first
2. Add –ide to ending of the anion
For example:
• Na2CO3
• KNO3
Polyatomic
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POLYATOMIC: FORMULA
• Example:
• Ammonium sulfide
• Aluminum sulfate
If necessary!
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CFU
Example Formula
Sodium Nitrate
Aluminum Phosphate
*Silicon Sulfate
Formula Name
NaNO3
Na2SO4
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REVIEW
Day 5 – review for test
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VALENCE ELECTRONS
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WHAT ARE IONS?
A charged atom that results from it losing or gaining an electron
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Once the electron is lost / gained (respectively), these atoms become IONS
CFU!
Sodium (Na) becomes ……
CFU!
Fluorine (F) becomes ……
WHAT ARE IONS?
A charged atom that results from it losing or gaining an electron
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IONIC VS COVALENT
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CFU: DO YOU GET IT?
ElementWhat will it form?
Cation or AnionIon Symbol
F
K
Al
N
Anion
Cation
Cation
Anion
F-
K+
Al3+
N3-
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FORMING IONIC COMPOUNDS
Al + P Al3+ P3-
Li + O
Li
Li 1+ O2-
The #2 below an
element indicates that
you used 2 of them
Li 1+
Li2 O
Al P
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FORMING COVALENT COMPOUNDS
C OO
CO2
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WRITING NAMES
1. Is it polyatomic or ?
3 or
more
elements1 or 2
element
s
Name the cation first (+)
Name the anion after (-)
4 MG(OH)2MgCl2
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1. Is it polyatomic or ?
3 or
more
elements1 or 2
element
s
Name the cation first (+)
Name the anion after (-)
1) Na2CO3
2) NaOH
3) MgBr2
4) KCl
5) FeCl2
6) FeCl3
7) Zn(OH)2
8) Be2SO4
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2. Is it Ionic or covalent?
Metal +
non-
metal
1) PCl3
2) MgBr2
3) BrF5
4) KCl
5) FeCl2
6) FeCl3
7) N2O3
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3. Is it
Metal has
only 1
charge
EASY!
Name the metal
&
Change the non-metal ending to “ide”
Use roman numerals (I, II, III, IV) to
indicate the charge of the metal
&
Change the non-metal ending to “ide”
1) MgBr2
2) FeCl3
3) BrF5
4) KCl
5) FeCl2