Predicting Products in Predicting Products in Chemical ReactionsChemical Reactions

Steps to Writing ReactionsSteps to Writing Reactions• Some steps for doing reactions

1. Identify the type of reaction2. Predict the product(s) using the type of

reaction as a model3. Balance it

Don’t forget about the diatomic elements! (HI BrONClF) For example, Oxygen is O2 as an

element.

In a compound, it can’t be a diatomic element because it’s not an element anymore, it’s a compound!

SynthesisSynthesis

Example C + OExample C + O22

OO C + O O C

OO COO C OO C OO C OO

C OO

C OO

CO

O

C OO

C O

O C O

O C OO C

OO C OO C

General: General: A + B A + B AB AB

Synthesis: PracticeSynthesis: Practice• Predict the products. Write and balance

the following synthesis reaction equations.• Sodium + chlorine

Na + Cl2

• Aluminum + fluorine Al + F2

NaNa++ & & ClCl--

11 11

NaCl1122 22

DecompositionDecomposition

Example 2HgOExample 2HgO

O Hg

O Hg

Hg

O O Hg

+

General: General: AB AB A + B A + B

Decomposition: PracticeDecomposition: Practice• Predict the products. Then, write and balance

the following decomposition reaction equations:

• Lead (IV) oxide PbO2

• Aluminum nitride AlN

Is either Is either a diatomic a diatomic molecule?molecule?

Pb + O2

11 11 11

Single replacementSingle replacement

Example: Zn + CuClExample: Zn + CuCl22

ZnClCl Cu +

General: General: AB + C AB + C AC + B AC + B

ClCl Zn Cu+

Practice: Single Practice: Single ReplacementReplacement

• Sodium chloride + fluorine

NaCl + F2

Note that fluorine replaces chlorine in the compound.• Aluminum + copper (II) nitrate Al + Cu(NO3)2

22 22 NaF + Cl11 11

NaNa++ & & FF--

11 11 Is Is

chlorine a chlorine a diatomic diatomic

molecule?molecule?

2

Double replacementDouble replacement

Example: MgO + CaSExample: MgO + CaS

General:General: AB + CD AB + CD AD + CB AD + CB

SOMg Ca+

O S

Mg Ca+

Practice: Double Practice: Double replacementreplacement

Calcium chloride + sodium phosphate

CaCl2 + Na3PO4

Lead II nitrate + barium chloride

Pb(NO3)2 + BaCl2

+Ca3(PO4)2

CaCa2+2+ & & POPO44

3-3-33 22NaNa+ + & Cl & Cl--11 11

NaCl

33 6622 11

Practice: CombustionPractice: Combustion

C5H12 + O2

C10H22 + O2

55 6688 CO2 + H2O

Remember products of combustion are always carbon dioxide and water

11

Mixed PracticeMixed PracticeState the type, predict the products, and balance

the following reactions:

BaCl2 + H2SO4

C6H12 + O2

Zn + CuSO4

Cs + Br2

FeCl3

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