(2.2) molecular compounds (p130-131) naming and all that
TRANSCRIPT
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(2.2) MOLECULAR COMPOUNDS (p130-131)
Naming and all that.
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Molecular Compounds
Molecular compounds are formed by combining two non-metals.
They do so by “sharing” electrons. The bond formed by sharing
electrons is called a covalent bond.
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Properties of Molecular Compounds
Often soft, liquid, solid or gas. If they dissolve in water, they form
solutions that do no conduct electricity.
Tend to have relatively low melting points.
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Naming Molecular Compounds
Naming molecular compounds is different than naming ionic compounds because non-metals can combine in many different ways.
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Naming Molecular Compounds
Eg. carbon and oxygen can combine 2 different ways!!!
carbon monoxide CO
carbon dioxide CO2
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Naming Molecular Compounds
To name a molecular compound prefixes are used to show the number of each type of atom.
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Prefix systemPrefix Number
mono 1
di 2
tri 3
tetra 4
penta 5
hexa 6
hepta 7
octa 8
nona 9
deca 10
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Examplesname formula
sulfur trioxide
dihydrogen monosulfide
SiO2
CF4
N2O5
disulfur dinitride
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Examplesname formula
sulfur trioxide SO3
dihydrogen monosulfide H2S
silicon dioxide SiO2
carbon tetrafluoride CF4
dinitrogen pentoxide N2O5
disulfur dinitride S2N2
NOTE: never have 2 vowels in a row between the prefix and element ex: 2 “o’s” monooxide
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Naming Molecular Compounds
A molecular compound has a two-part name:
firstfirst secondsecond
Non-metal Non-metal
Uses prefix for number
Uses prefix for number
Keeps its name Changes ending to “ide”
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Common Molecular Compounds
You must know these…. H2O water H2O2 hydrogen peroxide CH4 methane CO2 carbon dioxide
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Practice
-Video to recap!-Do: Worksheet 2.2 (C) - NAMING
MOLECULAR COMPOUND PRACTICE-Quiz-Molecular Compounds next class
TEST UNIT 1-Part A on THURSDAY!
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Classwork
Workbook- 46-48- 50-52 Worksheet 2.2 (D)-naming ALL!
REMINDER:TEST UNIT 1-Part A on THURSDAY, FEB 23