Nomenclature - Weeblykarenhilliard.weebly.com/uploads/1/6/3/5/16353128/nomenclature.pdf ·...
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Nomenclature PO4
3-
phosphate ion
C2H3O2-
acetate ion
HC2H3O2
Acetic Acid
SAVE PAPER AND INK!!! When you print out the notes on PowerPoint,
print "Handouts" instead of "Slides" in the print setup. Also,
turn off the backgrounds (Tools>Options>Print>UNcheck
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CHEMICAL BONDS A chemical bond is an electrostatic
(attractive) force that holds oppositely
charged particles together in an ionic
compound.
Bonds are represented using lines.
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FORMS OF CHEMICAL BONDS
There are 3 forms bonding atoms:
Ionic—complete transfer of 1 or more electrons from one atom to another (one loses, the other gains) between a metal and a nonmetal.
Covalent—some valence electrons shared between atoms of nonmetals.
Metallic – holds atoms of a metal together
Most bonds are
somewhere in
between ionic
and covalent.
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PROPERTIES OF COMPOUNDS Ionic Compounds- high melting and boiling points due to
strong bonds between ions. Ionic compounds in an aqueous
(water) solution conduct an electric charge, this means they
are good conductors of electricity. They gain or lose
electrons.
Covalent Compounds- low melting and boiling points and
have weak bonds. They only share electrons.
Metallic Compounds- have a “sea of electrons”, metal
atoms do not share or lose their valence electrons with
neighboring atoms. Instead they overlap their electrons.
They are malleable, ductile, and good conductors of
electricity. They tend to have high melting and boiling
points.
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COMMON NAMES A lot of chemicals have common
names as well as the proper
IUPAC name. (International Union
of Pure and Applied Chemistry)
Chemicals that should always be
named by common name and
never named by the IUPAC
method are: H2O water, not dihydrogen monoxide
NH3 ammonia, not nitrogen trihydride
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CATION +
ANION --->
COMPOUND
A neutral compound
requires
equal number of +
and - charges.
COMPOUNDS FORMED FROM IONS
Na+ + Cl- --> NaCl
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Predicting Charges on Monatomic Ions KNOW THESE !!!!
+1 +2 -3 -2 -1 0
Cd+2
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PROPERTIES OF IONIC COMPOUNDS
FORMING NACL FROM NA AND CL2
A metal atom can
transfer an electron to
a nonmetal.
The resulting cation
and anion are
attracted to each
other by
electrostatic forces.
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IONIC COMPOUNDS
NH4+
Cl-
ammonium chloride, NH4Cl
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SOME IONIC COMPOUNDS
Mg2+ + N-3 ---->
Mg3N2
magnesium nitride
Sn4+ + O2- ---->
SnO2
Tin (IV) oxide
calcium fluoride
Ca2+ + 2 F- ---> CaF2
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FORMULAS OF IONIC COMPOUNDS
Formulas of ionic compounds are determined
from the charges on the ions
atoms ions
–
Na + F : Na+ : F : NaF
sodium + fluorine sodium fluoride formula
Charge balance: 1+ 1- = 0
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MONATOMIC IONS
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WRITING A FORMULA
Write the formula for the ionic compound that will form
between Ba2+ and Cl.
Solution:
1. Balance charge with + and – ions
2. Write the positive ion of metal first, and the
negative ion Ba2+ Cl
Cl
3. Write the number of ions needed as
subscripts BaCl2
4. Keep all subscripts together for polyatomic ions
(ex: CO3-2) K+ + CO3
-2 → K2CO3
NH4+ + CO3
-2 → (NH4)2CO3
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LEARNING CHECK
Write the correct formula for the compounds containing the following ions:
1. Na+, S2-
a) NaS b) Na2S c) NaS2
2. Al3+, Cl-
a) AlCl3 b) AlCl c) Al3Cl
3. Mg2+, N3-
a) MgN b) Mg2N3 c) Mg3N2
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SOLUTION
1. Na+, S2-
b) Na2S
2. Al3+, Cl-
a) AlCl3
3. Mg2+, N3-
c) Mg3N2
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COMMON POLYATOMIC IONS Negative 1 Charge
Acetate C2H3O2-1
Perchlorate ClO4-1
Chlorate ClO3-1
Chlorite ClO2-1
Hypochlorite ClO-1
Cyanide CN-1
Hydrogen Carbonate or
Bicarbonate HCO3-1
Hydrogen Sulfate HSO4-1
Hydroxide OH-1
Nitrate NO3-1
Permanganate MnO4-1
Nitrite NO2-1
Negative 2 Charge
Carbonate CO3-2
Chromate CrO4-2
Dichromate Cr2O7-2
Oxalate C2O4-2
Sulfate SO4-2
Sulfite SO3-2
Selenate SeO4-2
Negative 3 Charge
Phosphate PO4-3
Phosphite PO3-3
Borate BO3-3
Positive 1 Charge
Ammonium NH4+1
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CRISS CROSS METHOD
• Positive Ion always
written first
• If you have a
polyatomic ion, you
must put it in
parentheses ( ) if
you cross a number
other than 1 to the
bottom. Ex: Be+2
SO4-3 Be3(SO4)2
You do not have to
put Be in
parentheses since it
is a monatomic ion
(just one atom).
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COUNTING ATOMS
NaCl
NaOH
Mg(OH)2
Ca3(PO4)2
NH4Cl
(NH4)3PO4
LiNO3
BeSO4
SrSO3
Cs2CO3
How many atoms are in the following compounds?
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NAMING COMPOUNDS
1. Cation first, then anion
2. Monatomic cation = name of the
element
Ca2+ = calcium ion
3. Monatomic anion = root + -ide
Cl = chloride
CaCl2 = calcium chloride
Binary Ionic Compounds:
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NAMING BINARY IONIC COMPOUNDS
Examples:
NaCl
ZnI2
Al2O3
sodium chloride
zinc iodide
aluminum oxide
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LEARNING CHECK
Complete the names of the following binary compounds:
Na3N sodium ________________
KBr potassium ________________
Al2O3 aluminum ________________
MgS _________________________
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TRANSITION METALS
Elements that can have more than one possible
charge MUST have a Roman Numeral to indicate
the charge on the individual ion.
1+ or 2+ 2+ or 3+
Cu+, Cu2+ Fe2+, Fe3+
copper(I) ion iron(II) ion
copper (II) ion iron(III) ion
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NAMES OF VARIABLE IONS
These elements REQUIRE Roman Numerals because they can have more than one possible charge:
anything except Group 1A, 2A, Ag, Zn, Cd, and Al (You should already know the charges on these!) Or another way to say it is: Transition metals and the metals in groups 4A and
5A (except Ag, Zn, Cd, and Al) require a Roman Numeral.
FeCl3 (Fe3+) iron (III) chloride
CuCl (Cu+ ) copper (I) chloride
SnF4 (Sn4+) tin (IV) fluoride
PbCl2 (Pb2+) lead (II) chloride
Fe2S3 (Fe3+) iron (III) sulfide
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EXAMPLES OF OLDER NAMES OF
CATIONS FORMED FROM TRANSITION
METALS (YOU DO NOT HAVE TO MEMORIZE THESE)
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LEARNING CHECK
Complete the names of the following binary
compounds with variable metal ions:
FeBr2 iron (_____) bromide
CuCl copper (_____) chloride
SnO2 ___(_____ ) ______________
Fe2O3 ________________________
Hg2S ________________________
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NAMING COMPOUNDS
Poly- many
Bi- 2
Polyatomic ions- many (2 or more) atoms bonded
together that have a charge (positive or negative
charge).
Binary-2 atoms or elements bonded together
Ternary- 3 or more atoms bonded together
Oxidation number- charge of the atom
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NAMING IONIC COMPOUNDS
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POLYATOMIC IONS NO3
-
nitrate ion
NO2-
nitrite ion
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POLYATOMIC IONS
You can make additional polyatomic ions by adding a H+ to the ion!
CO3 -2 is carbonate
HCO3– is hydrogen carbonate
H2PO4– is dihydrogen phosphate
HSO4– is hydrogen sulfate
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TERNARY IONIC NOMENCLATURE
Writing Formulas
Write each ion, cation first. Don’t show charges in the final formula.
Overall charge must equal zero. If charges cancel, just write symbols. If not, use subscripts to balance charges.
Use parentheses to show more than one of a particular polyatomic ion.
Use Roman numerals indicate the ion’s charge when needed (stock system)
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TERNARY IONIC NOMENCLATURE
Sodium Sulfate
Na+ and SO4 -2
Na2SO4
Iron (III) hydroxide
Fe+3 and OH-
Fe(OH)3
Ammonium carbonate
NH4+ and CO3
–2
(NH4)2CO3
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TYPES OF REACTIONS Endothermic reaction- a chemical reaction in which a
greater amount of energy is required to break the bonds
than is released. (energy in) These reactions are cool to the
touch in a container.
Exothermic reaction- a chemical reaction in which more
energy is released than is required to break the bonds.
(energy out) The formation of ionic compounds is
exothermic. Burning something releases energy and is an
exothermic reaction.
Delocalized electron- the electrons involved in metallic
bonding that are free to move easily from one atom to the
next.
Oxyanion- a polyatomic ion composed of an element,
usually a nonmetal, bonded to one or more oxygen atoms. Ex: Sulfate SO4
-2 Sulfite SO3-2 Nitrate NO3
- , Nitrite NO2- , etc.
Formula unit- the simplest ratio of ions represented in an
ionic compound. Ex: Ba2O2 can be simplified to BaO,
Ca2(SO4)2 can be simplified to CaSO4
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LEARNING CHECK
1. aluminum nitrate
a) AlNO3 b) Al(NO)3 c) Al(NO3)3
2. copper(II) nitrate
a) CuNO3 b) Cu(NO3)2 c) Cu2(NO3)
3. Iron (III) hydroxide
a) FeOH b) Fe3OH c) Fe(OH)3
4. Tin(IV) hydroxide
a) Sn(OH)4 b) Sn(OH)2 c) Sn4(OH)
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NAMING TERNARY COMPOUNDS
Contains at least 3 elements
There MUST be at least one polyatomic ion
(it helps to circle the ions)
Examples:
NaNO3 Sodium nitrate
K2SO4 Potassium sulfate
Al(HCO3)3 Aluminum bicarbonate
or
Aluminum hydrogen carbonate
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LEARNING CHECK
Match each set with the correct name:
1. Na2CO3 a) magnesium sulfite
MgSO3 b) magnesium sulfate
MgSO4 c) sodium carbonate
2 . Ca(HCO3)2 a) calcium carbonate
CaCO3 b) calcium phosphate
Ca3(PO4)2 c) calcium bicarbonate
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MIXED PRACTICE!
Name the following:
1. Na2O
2. CaCO3
3. PbS2
4. Sn3N2
5. Cu3PO4
6. HgF2
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MIXED UP… THE OTHER WAY
Write the formula:
1. Copper (II) chlorate
2. Calcium nitride
3. Aluminum carbonate
4. Potassium bromide
5. Barium fluoride
6. Cesium hydroxide
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NAMING MOLECULAR COMPOUNDS
CH4 methane BCl3
boron trichloride
CO2 Carbon dioxide
All molecular/
covalent
compounds
formed from
two or more
nonmetals.
Ionic
compounds
generally
involve a metal
and nonmetal
(NaCl)
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MOLECULAR (COVALENT) NOMENCLATURE
FOR TWO NONMETALS
Prefix System (binary compounds)
1. Less electronegative atom
comes first.
2. Add prefixes to indicate # of atoms. Omit mono-
prefix on the FIRST element. Mono- is OPTIONAL on
the SECOND element (in this class, it’s NOT
optional!).
3. Change the ending of the
second element to -ide.
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MOLECULAR NOMENCLATURE PREFIXES
PREFIX
mono-
di-
tri-
tetra-
penta-
hexa-
hepta-
octa-
nona-
deca-
NUMBER
1
2
3
4
5
6
7
8
9
10
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• CCl4
• N2O
• SF6
• carbon tetrachloride
• dinitrogen monoxide
• sulfur hexafluoride
MOLECULAR NOMENCLATURE:
EXAMPLES
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• arsenic trichloride
• dinitrogen pentoxide
• tetraphosphorus decoxide
• AsCl3
• N2O5
• P4O10
MORE MOLECULAR EXAMPLES
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LEARNING CHECK
Fill in the blanks to complete the following
names of covalent compounds.
CO carbon ______oxide
CO2 carbon _______________
PCl3 phosphorus _______chloride
CCl4 carbon ________chloride
N2O _____nitrogen _____oxide
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LEARNING CHECK
1. P2O5
a) phosphorus oxide
b) phosphorus pentoxide
c) diphosphorus pentoxide 2. Cl2O7
a) dichlorine heptoxide
b) dichlorine oxide
c) chlorine heptoxide 3. Cl2 a) chlorine
b) dichlorine
c) dichloride
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OVERALL STRATEGY FOR NAMING
CHEMICAL COMPOUNDS.
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A FLOW CHART FOR NAMING BINARY COMPOUNDS.
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MIXED REVIEW
Name the following compounds:
1. CaO
a) calcium oxide b) calcium(I) oxide
c) calcium (II) oxide
2. SnCl4
a) tin tetrachloride b) tin(II) chloride
c) tin(IV) chloride
3. N2O3
a) nitrogen oxide b) dinitrogen trioxide c) nitrogen trioxide
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SOLUTION
Name the following compounds:
1. CaO
2. SnCl4
3. N2O3
a) calcium oxide
c) tin(IV) chloride
b) Dinitrogen trioxide
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MIXED PRACTICE
1. Dinitrogen monoxide
2. Potassium sulfide
3. Copper (II) nitrate
4. Dichlorine heptoxide
5. Chromium (III) sulfate
6. Iron (III) sulfite
7. Calcium oxide
8. Barium carbonate
9. Iodine monochloride
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MIXED PRACTICE
1. BaI2
2. P4S3
3. Ca(OH)2
4. FeCO3
5. Na2Cr2O7
6. I2O5
7. Cu(ClO4)2
8. CS2
9. B2Cl4
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ACID NOMENCLATURE
Acids
Compounds that form H+ in water.
Formulas usually begin with ‘H’.
In order to be an acid instead of a gas, binary acids
must be aqueous (dissolved in water)
Ternary acids are ALL aqueous
Examples:
HCl (aq) – hydrochloric acid
HNO3 – nitric acid
H2SO4 – sulfuric acid
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Anion Ending Acid Name
-ide hydro-(stem)-ic acid
-ate (stem)-ic acid
-ite (stem)-ous acid
ACID NOMENCLATURE REVIEW
No Oxygen
w/Oxygen
An easy way to remember which goes with which…
“In the cafeteria, you ATE something ICky”
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ACID NOMENCLATURE FLOWCHART
hydro- prefix
-ic ending
2 elements
-ate ending
becomes
-ic ending
-ite ending
becomes
-ous ending
no hydro- prefix
3 elements
ACIDSstart with 'H'
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• HBr (aq)
• H2CO3
• H2SO3
• 2 elements, -ide
• 3 elements, -ate
• 3 elements, -ite
hydrobromic acid
carbonic acid
sulfurous acid
ACID NOMENCLATURE
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• hydrofluoric acid
• sulfuric acid
• nitrous acid
• 2 elements
• 3 elements, -ic
• 3 elements, -ous
HF (aq)
H2SO4
HNO2
ACID NOMENCLATURE
H+ F-
H+ SO42-
H+ NO2-
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NAME ‘EM!
HI (aq)
HCl
H2SO3
HNO3
H3PO4
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WRITE THE FORMULA!
Hydrobromic acid
Nitrous acid
Carbonic acid
Phosphoric acid
Hydrotelluric acid
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Nomenclature Summary Flowchart
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RAINBOW MATRIX GAME
Link on Chemistry Geek.com on Chemistry I page
http://chemistrygeek.com/rainbow
Use [ ] to represent subscripts since you can’t enter subscripts into the computer
So H2O would be H[2]O
And Al2(SO4)3 would be Al[2](SO[4])[3]
Additional Polyatomic Ions (you do not have to memorize these, but they are in the game!)
Borate = BO3 -3 ; Silicate = SiO4
-4 ; Manganate = MnO4
-2 (permanganate is -1)