Decomposition Reaction Quiz

Balance this equation.

a) ​ (a)   NaCl(s) → ​ (b)   Na(s) + ​ (c)   Cl₂(g)

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Organize these options into the right categories

Groups:

(a) Synthesis

,

(b) Decomposition

• j) Zn(OH)₂  → ZnO  +  H₂O

• l) Cr  +  O₂  →  Cr₂O₃

• e)  Ca  + O₂  → CaO

• i) Al  +  Br₂  → AlBr₃

• h) CaCO₃  →  CaO  + CO₂

• g) H₂  + O₂ →  H₂O

• f) H₂  + N₂  → NH₃

• k)  HgO  →  Hg  +  O₂

Match the following

• Decomposition

• 
• Other Reaction Type

• 
• Synthesis

• 

a) What is this decomposition reaction in words?
NaCl(s) → Na(s) + Cl₂(g)

• Sodium chlorine → sodium + chloride

• Sodium chlorine → sodium + chlorine

• Sodium chloride → sodium + chlorine

• Sodium chloride → sodium + chloride

Balance this reaction:

b)​ (a)   K₂S(s)  →  ​ (b)   S(s) + ​ (c)   K(s)

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b) K₂S(s)  →  S(s) + K(s)
In words, this reaction is ________ → sulfur + potassium

What is the unbalanced chemical equation for:

​ c) Calcium carbonate decomposes into calcium oxide and carbon dioxide.

• CaCO₃ → CaO + CO₂

• CaCO₃ → CaO₂ + CO₂

• Ca(CO₃)₂ → CaO + CO₂

• Ca(CO₃)₂ → CaO₂ + CO₂

Balance the decomposition reaction below:
c) ​ (a)   CaCO₃ → ​ (b)   CaO + ​ (c)   CO₂

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What is the unbalanced chemical equation for this reaction?
Water can break down into oxygen and hydrogen when electricity is passed through it.

• H₂O → H + O₂

• H₂O → H + O

• H₂O → H₂ + O

• H₂O → H₂ + O₂

Balance this equation and indicate the type.

g)  ​ ​ (a)   H₂  +  ​ (b)   O₂  →  ​ (c)   H₂O Type: ​ (d)  

• synthesis
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• decomposition
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