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The table shows four reactions.

Reactions
Reaction Equation
1 C3H₈ + 5O₂ → 3CO₂ + 4H₂O
2 C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
3 AgNO₃ + NaCl → AgCl + NaNO₃
4 2Fe + O₂ → 2FeO


Which of the above reactions is an example of a combustion and also a synthesis reaction?
a. 1
b. 2
c. 3
d. or 4

1 Answer

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Final answer:

Reaction 4, the reaction of iron with oxygen to form iron(II) oxide (2Fe + O₂ → 2FeO), is both a combustion and a synthesis reaction. The correct answer is option d.

Step-by-step explanation:

The student has asked which of the four given chemical reactions is an example of a combustion and also a synthesis reaction. A combustion reaction involves a substance reacting with oxygen, often producing heat and light, and typically results in the formation of water and carbon dioxide when an organic compound is burnt.

A synthesis reaction, on the other hand, involves the combination of two or more substances to form a new single compound. The correct answer is d. Reaction 4, which is the reaction 2Fe + O₂ → 2FeO. This is a synthesis reaction because iron (Fe) and oxygen (O₂) combine to form a single compound, iron(II) oxide (FeO).

It is also a combustion reaction as iron reacts with oxygen, which is a form of combustion. The other reactions listed do not represent both combustion and synthesis simultaneously.

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