Question

2
identify the reaction type: * (0.5 points)
cao ->
singlereplacement
combustion
synthesis
decomposition
doublereplacement

Explanation:

Wait, the reaction given as \( CaO
ightarrow \) seems incomplete. But if we assume a common reaction like \( CaCO_3
ightarrow CaO + CO_2 \) (decomposition), but if the reaction is \( Ca + O_2
ightarrow CaO \), that's synthesis. Wait, the original problem's reaction is written as \( CaO
ightarrow \), maybe a typo. But if we consider typical reactions: Synthesis reactions combine substances (A + B → AB), decomposition is AB → A + B, single replacement is A + BC → AC + B, double replacement is AB + CD → AD + CB, combustion involves fuel + O₂. If the reaction is forming CaO (like \( Ca + O_2
ightarrow CaO \)), that's synthesis (combining calcium and oxygen to form calcium oxide). So the correct type would be Synthesis.

Answer:

C. Synthesis (assuming the reaction is a synthesis reaction forming CaO, e.g., \( 2Ca + O_2
ightarrow 2CaO \); if the reaction was decomposition, it would be breaking down, but the given reactant is CaO, so likely a typo and the intended reaction is synthesis to form CaO from its elements)