Writing Net Ionic Writing Net Ionic EquationsEquations

Review UCEHBReview UCEHB

Double Replacement Double Replacement (UCEHB pg. 47; 55)(UCEHB pg. 47; 55)

Redox / Single Replacement Redox / Single Replacement (UCEHB pg. (UCEHB pg. 45;63)45;63)

Composition/Decomposition Composition/Decomposition (UCEHB pg. (UCEHB pg. 75)75)

Complex Ions Complex Ions (UCEHB pg. 23;79)(UCEHB pg. 23;79)

Combustion Combustion (UCEHB pg. 29)(UCEHB pg. 29)

Double Replacement Double Replacement ReactionsReactions

Identify the type:Identify the type:– Acid / Base: look for terms like excess;equal Acid / Base: look for terms like excess;equal

number of moles; equal volumes of __M. number of moles; equal volumes of __M. Think about the types of acids/bases; Think about the types of acids/bases; conjugate acid/base pairs.conjugate acid/base pairs.

NHNH33 + HF + HF NH NH44++ + F + F ––

– Precipitation: memorize the solubility rules.Precipitation: memorize the solubility rules. BaBa2+2+ + SO + SO44

2-2- BaSO BaSO44

– Both Both 2 H2 H++ + SO + SO44

2-2- + Ca(OH) + Ca(OH)22 CaSO CaSO44 + 2 HOH + 2 HOH

Double Replacement Double Replacement ReactionsReactions

– Reactants frequently in aqueous Reactants frequently in aqueous solutions.solutions.

– Produce molecular compound such as Produce molecular compound such as water; gas; or precipitate.water; gas; or precipitate.

– Know how these gases COKnow how these gases CO22; SO; SO22; NH; NH33; ; and Hand H22S are formed.S are formed.

– Solubility rules help tell:Solubility rules help tell:» Which are ions in solution.Which are ions in solution.» Identify the precipitate.Identify the precipitate.

Redox / Single Redox / Single ReplacementReplacement RedoxRedox

Know: Know: – Common oxidizing and reducing agents and the products Common oxidizing and reducing agents and the products

formed. formed. (UCEHB pg.68)(UCEHB pg.68)

– Use of key terms: acidifiedUse of key terms: acidified

MnOMnO44-- ; H ; H22OO22 ; Cr ; Cr22OO77

2-2- ; HNO ; HNO33

– Elements with multiple oxidation statesElements with multiple oxidation states

SnSn2+2+; Sn; Sn4+4+; Cr; Cr2+2+; Cr; Cr3+3+; Cr; Cr6+6+;; II-- ; IO ; IO-- ; IO ; IO22-- ; ;

O(-1 or -2)O(-1 or -2)

– Acidic and Basic conditionsAcidic and Basic conditions

4 MnO4 MnO44- - + 12 H+ 12 H++ + 20 H + 20 H22OO22 4 Mn 4 Mn2+2+ + 15 O + 15 O22 + 26 H + 26 H22OO

Redox / Single Redox / Single ReplacementReplacement

Single ReplacementSingle Replacement

Like replaces likeLike replaces like– Metals replace metals. Metals replace metals.

2Na2Na(s)(s) + 2H + 2H22OO(l)(l) 2 NaOH 2 NaOH(aq)(aq) + H + H2(g)2(g)

2Na + 2HOH 2Na + 2HOH 2 NaOH + H 2 NaOH + H22

2 Na 2 Na (s)(s) + 2H + 2H22O O (l)(l) 2Na 2Na+ + (aq)(aq) + 2OH + 2OH-- (aq)(aq) + H + H2(g)2(g)

– Nonmetals replace nonmetals.Nonmetals replace nonmetals.

ClCl22 (g)(g) + 2 KI + 2 KI (aq)(aq) 2 K 2 K+ + (aq)(aq) + 2 Cl + 2 Cl-- (aq)(aq) + I + I2(s)2(s)

ClCl2 (g)2 (g) + 2 KI + 2 KI (aq)(aq) 2 K 2 K+ + (aq)(aq) + 2 Cl + 2 Cl- - (aq)(aq) + I + I2 (s)2 (s)

Must be in aqueous solution to dissociate. Strong bases in aqueous solution 100% dissociation.

CombustionCombustion

Reaction of a hydrocarbon/alcohol or Reaction of a hydrocarbon/alcohol or other organic molecule with oxygen gas other organic molecule with oxygen gas to produce carbon dioxide and water. to produce carbon dioxide and water. – Oxygen is a reactant. Oxygen is a reactant.

CC33HH88 + 5O + 5O22 → 3CO→ 3CO22 + 4H + 4H22OO CHCH33CHCH22OH + 3OOH + 3O22 → 2CO → 2CO22 + 3H + 3H22O O

Decomposition/Decomposition/CompositionComposition

Decomposition: Decomposition: – has only one reactant and it breaks has only one reactant and it breaks

up into elements and /or compoundsup into elements and /or compounds

MgCOMgCO33 MgO + CO MgO + CO22

Ba(OH)Ba(OH)22 BaO + H BaO + H22OO

2Al2Al22OO33 4Al + 3O 4Al + 3O22

Decomposition/Decomposition/CompositionComposition

Composition:Composition:– has two reactants that combine into one has two reactants that combine into one

product:product:

SS88 + 8 O + 8 O22 8 SO 8 SO22

– Nonmetal oxides plus water makes Nonmetal oxides plus water makes

acid:acid:

SOSO33 + H + H22O O 2 H 2 H++ ++ SOSO44

2-2-

– Metal oxides plus water makes base:Metal oxides plus water makes base:

CaO + HCaO + H22O O Ca(OH) Ca(OH)22

Complex IonsComplex Ions

Particles that generally combine with Particles that generally combine with excess ammonia or hydroxides to form excess ammonia or hydroxides to form complex ions with a chargecomplex ions with a charge

CuCu2+2+ + 4 NH + 4 NH33 Cu(NH Cu(NH33))442+2+

AlAl3+3+ + 4 OH + 4 OH-- Al(OH) Al(OH)44--

AgCl + 2 NHAgCl + 2 NH33 Ag(NH Ag(NH33))22++ + Cl + Cl--

having the correct ligand number is not having the correct ligand number is not required required but being but being consistent with number and charge is consistent with number and charge is

importantimportant

ReviewReview

Identify type of reaction.Identify type of reaction.– Remember: Remember:

» What drives each type of reaction.What drives each type of reaction.» Conditions that must be met for each reaction type.Conditions that must be met for each reaction type.

Write a balanced equation.Write a balanced equation.– Include phase notations.Include phase notations.

Write the ionic equation.Write the ionic equation.– Check for appropriate charges. Check for appropriate charges.

Write the net ionic equation. Write the net ionic equation. (This is your answer, (This is your answer, but the other steps may provide you with information you but the other steps may provide you with information you need to answer the questions!) need to answer the questions!) – Eliminate spectator ions.Eliminate spectator ions.