Test One Worksheet 5 Molecular and Ionic Compounds Flashcards
Combustion Reaction:
Compound + O₂ → H₂0 + CO₂
Molecular Formula
Shows the exact number of atoms in one molecule
Structural Formula:
Shows how atoms are connected together
Naming Molecular Compounds:
1) The elements that combine to form binary molecular compounds are both nonmetals
2) Name the first element
3) Name the second element, changing the end of its name to -ide
4) Use prefixes to denote multiple atoms
5) Tips: Generally omit mono- for first element.
6) Oxides: If second element ends with vowel, eliminate the last letter of -o or -a in prefix when naming
Mono-
One
Di-
Two
Tri-
Three
Tetra-
Four
Penta-
Five
Hexa-
Six
Hepta-
Seven
Octa-
Eight
Nona-
Nine
Deca-
Ten
SO₄
1) Sulfur Oxygen
2) Sulfur Oxide
3) Sulfur Tetroxide
SO₅
1) Sulfur Oxygen
2) Sulfur Oxide
3) Sulfur Pentoxide
SO
1) Sulfur Oxygen
2) Sulfur Oxide
3) Sulfur Monoxide
B₂H₆
Diborane
SiH₄
Silane
NH₃
Ammonia
PH₃
Phosphine
H₂0
Water
H₂S
Hydrogen sulfide
Polyatomic (Molecular) Ions
Molecular compounds that have a charge
Both positive and negative
Same element with different number of oxygens, -ate vs. -ite
Naming Molecular Acids. Simple Acids:
1) Have hydrogen attached to single anion
2) Take anion name
3) Combine second element name with hydro-
4) Replace -ide with -ic acid
HCl
Hydrochloric Acid
Naming Oxoacids- Hydrogen attached to polyatomic ion with oxygens
1) NO hydro-
2) -ate turns to -ic
3) -ite turns to -ous
H₂SO₃
1) recognize SO₃ is a polyatomic ion with an oxygen
2) its name when looked up is Sulfite
3) Sulfite → Sulfurous acid
Empirical Formula
Whole-number ratio of elements in molecular compound
Molecular Formula
Exact number of each element in a molecular compound
Ionic Compounds
Combination of oppositely charge ions which make an ionic bond
Ionic Compound
Metal and non-metal, Metal and polyatomic ion
Ionic bonds
electrons are not shared
Ionic compounds
made up of cations and anions
Ionic compounds
Charges of anions and cations must balance
Formula for Al³⁺ and CO₃²⁻
Al₂(CO₃)₃
Ionic Compounds
Lattice, (structured packing of cations and anions), highly ordered ratio of ions ∴ only empirical formulas are used with ionic compounds
Cations
Positive
Anions
Negative
Naming Ionic Compounds:
1) Name the first element
2) Add -ide on the end of the name of the second element
3) Add a roman numeral for first element if can have more than one charge
Naming Ionic Compounds Ex) MgCl₂
1) Magnesium Chloride
Ionic Compounds
DO NOT USE PREFIXES
Naming Ionic Compounds Ex) FeSO₄
Iron (II) Sulfate
Naming Ionic Compounds Ex) CrS
1) Chromium + Sulfur
2) Chromium (II) Sulfide
Cr₂S₃
Chromium (III) Sulfide
ClO₃-
Chlorate Base ion -ate
ClO₂-
Chlorite Ion with one less oxygen -ite
ClO₄-
Perchlorate (Ion with one more oxygen)
ClO-
Hypochlorite (keep the -ite and add the hypo)
Naming Hydrates
Ionic compounds that have a specified number of water molecules within their lattice
Hydrate example: LiCl * H₂0
lithium chloride monohydrate
HClO
hypochlorous acid