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Which of the following correctly shows a synthesis reaction involving potassium?

A. Br2 + 2KI → I2 + 2KBr
B. 4K + O2 → 2K2O
C. 2KClO3 → 2KCl + 3O22KClO3 → 2KCl + 3O2
D. 2K2O → 4K + O22K2O → 4K + O2

1 Answer

6 votes

Answer:

B. 4 K + O₂ → 2 K₂O

Step-by-step explanation:

Which of the following correctly shows a synthesis reaction involving potassium?

A. Br₂ + 2 KI → I₂ + 2 KBr

No, this is a single displacement reaction, in which Br displaces I from its salt.

B. 4 K + O₂ → 2 K₂O

Yes, this is a synthesis reaction, in which 2 elements combine to form a compound.

C. 2 KClO₃ → 2 KCl + 3 O₂

No, this is a decomposition reaction, in which a big substance decomposes into smaller ones.

D. 2 K₂O → 4K + O₂

No, this is a decomposition reaction, in which a big substance decomposes into smaller ones.

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