Types of Chemical Reactions Worksheet

Let’s go step by step to match each reaction or description with the correct type of chemical reaction.

We are given these types:
- Synthesis: Two or more substances combine to form one new substance. (A + B → AB)
- Decomposition: One substance breaks down into two or more simpler substances. (AB → A + B)
- Single Displacement: One element replaces another in a compound. (AB + C → AC + B)
- Double Displacement: Two compounds switch partners. (AB + CD → AD + CB)
- Combustion: Burning, usually with oxygen, producing CO₂ and H₂O (especially for hydrocarbons).

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Now let’s solve each item:

a. KClO₃ → KCl + O₂
One reactant breaks into two products → Decomposition

b. NaOH + FeCl₃ → NaCl + Fe(OH)₃
Two compounds swap ions: Na pairs with Cl⁻, Fe³⁺ pairs with OH⁻ → Double Displacement

c. K + H₂O → KOH + H₂
Element (K) replaces H in water → Single Displacement

d. CaBr₂ + Na₂CO₃ → CaCO₃ + NaBr
Wait — this equation is unbalanced! But we’re classifying type, not balancing.
Ca²⁺ swaps with Na⁺ → Double Displacement

*(Note: Actually, it should be CaBr₂ + Na₂CO₃ → CaCO₃ + 2NaBr — but again, type is still double displacement.)*

e. C₁₂H₂₂O₁₁ + 12 O₂ → 12 CO₂ + 11 H₂O
Sugar burning with oxygen → produces CO₂ and H₂O → Combustion

f. ○ + ● → ○●
Two things combine into one → Synthesis

g. ⚫ + ○● → ● + ○
An element (⚫) replaces part of a compound (○●), freeing ○ → Single Displacement

h. ○●⚫ → ○● + ⚫
One compound breaks into two parts → Decomposition

i. ○● + ⚫■ → ○■ + ●
Two compounds swap partners → Double Displacement

j. Two or more substances form a new substance → Definition of Synthesis

k. One substance breaks down into two or more simpler substances → Decomposition

l. One element replaces another element in a compound → Single Displacement

m. Two compounds are combined and switch partners → Double Displacement

n. Burning results in water and carbon dioxide → Classic sign of Combustion

o. A + B → AB → Formula for Synthesis

p. AB → A + B → Formula for Decomposition

q. AB + CD → AD + CB → Formula for Double Displacement

r. AB + C → AC + B → Formula for Single Displacement

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✔ All matched correctly.

Final Answer:
a. Decomposition
b. Double Displacement
c. Single Displacement
d. Double Displacement
e. Combustion
f. Synthesis
g. Single Displacement
h. Decomposition
i. Double Displacement
j. Synthesis
k. Decomposition
l. Single Displacement
m. Double Displacement
n. Combustion
o. Synthesis
p. Decomposition
q. Double Displacement
r. Single Displacement