CH 7 Chemical Formulas and Chemical Compounds
ammonium phosphate
(NH₄)₃PO₄
1. Gain electrons 2. Negative charge 3. Usually nonmetals 4. Drop ending add "ide" suffix
Anions
CH₃O₂
Empirical formula for C₂H₆O₄
CH₂
Empirical formula for C₆H₁₂
HgCl₆
Empirical formula for Hg₂C₁₂
N₂O₅
Empirical formula for N₂O₅
iron (III) nitrate
Fe(NO₂)₃
iron (II) nitrate
Fe(NO₃)₂
(NH₄)₃PO₄
Formula for ammonium phosphate
CuCO₃
Formula for copper (II) carbonate
HNO₂
Formula for nitrous acid
NaOH
Formula for sodium hydroxide
Na₂SO₃
Formula for sodium sulfite
SnS₂
Formula for tin (IV) sulfide
tin (IV) oxide
Give the Stock system name for SnO₂
SnO
Give the formula for the other oxide of tin
True
True/False: Binary ionic compounds are composed of metals and nonmetals, typically from opposite sides of the periodic table
True
True/False: Covalently bonded binary molecular compounds are typically composed of nonmetals
nitrogen (IV) oxide
What is the Stock system name for NO₂?
Iron (II) oxide
What is the Stock system name for the compound FeO?
N₂O₃
What is the formula for dinitrogen trioxide?
H₂SO₃
What is the formula for sulfurous acid?
N₂O₅
What is the formula for the compound dinitrogen pentoxide?
Phosphoric acid
What is the name for the acid H₃PO₄?
As₂O₅
diarsenic pentoxide
nitrogen (V) oxide
dinitrogen pentoxide
O⁻²
oxide anion
S⁻²
sulfide anion
Al₂S₃
Aluminum sulfide
1. Lose electrons 2. Positive charge 3. Usually metals 4. Get to keep their names
Cations
CsCO₃
Cesium carbonate
(C) Changes the formula so that it no longer represents the compound it previously represented
Changing a subscript in a correctly written chemical formula: (A) changes the number of moles represented by the formula (B) changes the charges on the other ions in the compound (C) changes the formula so that it no longer represents the compound it previously represented (D) has no effect on the formula
cobalt (II) oxide
CoO
Binary compounds
Compounds composed of two elements
11 atoms
How many atoms are in Ca(HCO₃)₂?
45 atoms
How many atoms are in C₁₂H₂₂O₁₁?
10 atoms
How many atoms are in Fe(ClO₂)₃?
9 atoms
How many atoms are in Fe(ClO₃)₂?
13 atoms
How many atoms are represented by the formula Ca(HSO₄)₂?
21 atoms
How many atoms in total are present on one molecule of C₇H₅(NO₂)₃?
4 elements
How many elements make up C₇H₅(NO₂)₃?
6 oxygen
How many oxygen atoms are present in one molecule of C₇H₅(NO₂)₃?
Molecular compounds composed solely of carbon and hydrogen
Hydrocarbons
HI
Hydroiodic acid
(C) the charge of each Fe ion
In a Stock system name such as iron (III) sulfate, the Roman numeral tells us: (A) how many atoms of Fe are in one formula unit (B) how many sulfate ions can be attached to the iron atom (C) the charge of each Fe ion (D) the total positive charge of the formula unit
Mg⁺²
Magnesium cation
magnesium perchlorate
Mg(ClO₄)₂
Ions formed from a single atom
Monatomic ions
Naming system
Nomenclature
A polyatomic ion that contains oxygen
Oxyanion
Polyatomic ions that contain oxygen
Oxyanions
lead (II) chloride
PbCl₂
K⁺
Potassium cation
An ionic compound composed of a cation and the anion from an acid
Salt
System of naming chemical ions and elements
Stock system
CO
carbon monoxide
Cl⁻
chloride anion
