Reaction types

TYPES OF CHEMICAL REACTIONS

• 5 types of chemical reactions that require balanced equations according to the law of conservation of mass

  • Synthesis Reaction

  • Decomposition Reaction

  • Single-Replacement Reaction

  • Double Replacement Reaction

  • Combustion - WE WILL NOT DO ANY COMBUSTION REACTIONS!!!!

• Notice the “state of matter” symbols (s=solid, l= liquid, g=gas)

You may also see the symbol (aq), which means the substance is aqueous (dissolved in water)

Synthesis Reaction

• Also called a “combination reaction”

• There are 2 reactants and one product

• Both the reactants and products can be compounds

​What this looks like in a chemical equation:

N₂(g) + 3H₂(g) → 2NH₃(g)  

Multiple Choice

Without balancing the final equation, predict the products for the synthesis reaction: Li + Cl_2​ →  ?

• LiCl₂

• LiCl

• Li₂Cl₂

• Li₂Cl

Multiple Choice

Write the overall balanced chemical equation for the synthesis reaction:

3Sr + N₂ --> ?

• 3Sr + N₂​ → SrN_2​

• 3Sr + N₂​ → Sr₃​N_2​

• 3 Sr + N₂​ → 3Sr₃​N_2​

• 3Sr + N₂ --> SrN

Decomposition Reaction

• One reactant breaks down into two or more products.

​What this looks like in a chemical equation:

2H₂O → 2H₂ + O₂

Multiple Choice

Without balancing the final equation, predict the products for the decomposition reaction:

2PaI₅ → ?

• 2PaI₅ → 2Pa + 5I₅ +O

• 2PaI₅ → 5I₅

• 2PaI₅ → 2Pa

• 2PaI₅ → 2Pa + 2I₅

Multiple Choice

Write the overall balanced chemical equation below:

2NaCl --> __Na + Cl₂

• 2NaCl --> 2Na + Cl₂

• 2NaCl --> Na + Cl₂

• 2NaCl --> 3Na + Cl₂

• 2NaCl --> 4Na + Cl₂

Single-Replacement Reaction

A single uncombined element replaces another element in an ionic compound.

​What this looks like in a chemical equation:

2FeCl₃ + 3Zn → 2Fe + 3ZnCl₂ 

Multiple Choice

Without balancing the final equation, predict the products for the Single replacement reaction: 

2Al + 6HCl →

• 2Al + 6HCl → 2AlH_{2 +}Cl₃

• 2Al + 6HCl → 2AlCl₃+ 3H₂

• 2Al + 6HCl → 2Al + 3H₂Cl₃

• 2Al + 6HCl → 2Cl₃+ 3Al H₂

Multiple Choice

Write the overall balanced chemical equation below:

Cl₂ + 2NaBr →    2NaCl + Br₂

• Cl₂ + 2NaBr → 2NaCl + Br₂

• Cl₂ + 2NaBr → 3NaCl + Br₂

• Cl₂ + 2NaBr → 2NaBr₂ + Cl

• Cl₂ + 2NaBr → NaCl + Br₂

Double Replacement Reaction

Two reactants exchange ions to form two new products with the same type of chemical bonds. (Metals are written first, and negative ions switch places.)

Multiple Choice

Without balancing the final equation, predict the products for the double replacement reaction: 

Na₂CO₃ + CaCl₂ →CaCO₃ + 2NaCl

• Na₂CO₃ + CaCl₂ →CaCO₃ + 2NaC

• Na₂CO₃ + CaCl₂ →NaO₃ + 2NaCl

• Na₂CO₃ + CaCl₂ →CaCl₃ + 2NaCl

• Na₂CO₃ + CaCl₂ →CaCO₃ + 2NaCl

Multiple Choice

Write the overall balanced chemical equation below:

FeS+ HCl → __HS + __FeCl

• FeS + HCl → HS+ FeCl

• FeS + 2HCl→ HS + 3FeCl

• 2FeS + HCl → HS + FeCl₂

• FeS + 2HCl → HS + FeCl

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