Let’s go through each reaction one by one and identify the type based on what’s happening.
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1) Na₃PO₄ + 3 KOH → 3 NaOH + K₃PO₄
This looks like two compounds swapping partners:
Na₃PO₄ gives PO₄ to K, and KOH gives OH to Na.
That’s a
double displacement reaction (also called metathesis).
✔ Type:
Double Displacement
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2) MgCl₂ + Li₂CO₃ → MgCO₃ + 2 LiCl
Again, ions are swapping: Mg pairs with CO₃, Li pairs with Cl.
Same pattern — two compounds exchanging parts.
✔ Type:
Double Displacement
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3) C₆H₁₂ + 9 O₂ → 6 CO₂ + 6 H₂O
A hydrocarbon (C₆H₁₂) reacting with oxygen to make carbon dioxide and water?
That’s classic
combustion.
✔ Type:
Combustion
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4) Pb + FeSO₄ → PbSO₄ + Fe
One element (Pb) is replacing another in a compound (Fe in FeSO₄).
That’s
single displacement — also called single replacement.
✔ Type:
Single Displacement
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5) CaCO₃ → CaO + CO₂
One compound breaking into two simpler substances.
That’s
decomposition.
✔ Type:
Decomposition
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6) P₄ + 3 O₂ → 2 P₂O₅
Two elements combining to form one compound.
That’s
synthesis (or combination).
✔ Type:
Synthesis
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7) 2 RbNO₃ + BeF₂ → Be(NO₃)₂ + 2 RbF
Ions swapping again: Rb takes F, Be takes NO₃.
Another
double displacement.
✔ Type:
Double Displacement
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8) 2 AgNO₃ + Cu → Cu(NO₃)₂ + 2 Ag
Copper replaces silver in the compound. Element displaces another from its compound.
That’s
single displacement.
✔ Type:
Single Displacement
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9) C₃H₈O + 4 O₂ → 3 CO₂ + 3 H₂O
Organic compound + oxygen → CO₂ + H₂O → definitely
combustion.
✔ Type:
Combustion
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10) 2 C₅H₅ + Fe → Fe(C₅H₅)₂
Two molecules of C₅H₅ combining with Fe to make one product.
Elements/compounds joining to form one substance →
synthesis.
✔ Type:
Synthesis
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Final Answer:
1) Double Displacement
2) Double Displacement
3) Combustion
4) Single Displacement
5) Decomposition
6) Synthesis
7) Double Displacement
8) Single Displacement
9) Combustion
10) Synthesis
Parent Tip: Review the logic above to help your child master the concept of worksheet identifying reactants and products.
