a reaction in which a single compound breaks into simpler substances is: * 5 points
single replacement
double replacement
synthesis reaction
decomposition
in the equation 2h₂ + o₂ → 2h₂o, which are the reactants? * 5 points
o₂ only
h₂o only
o₂ and h₂
h₂ only

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Accepted Answer

# Brief Explanations:
- For the first question:
    - In a decomposition reaction, a single compound breaks down into simpler substances. In the given reaction $AB
ightarrow A + B$, a single compound $AB$ is breaking into $A$ and $B$.
    - In a single - replacement reaction, one element replaces another in a compound ($A+BC
ightarrow AC + B$).
    - In a double - replacement reaction, two compounds exchange ions ($AB+CD
ightarrow AD+CB$).
    - In a synthesis reaction, two or more substances combine to form a single compound ($A + B
ightarrow AB$).
- For the second question:
    - In a chemical equation $aA + bB
ightarrow cC + dD$, the substances on the left - hand side ($A$ and $B$) are reactants and the substances on the right - hand side ($C$ and $D$) are products.
    - In the equation $2H_{2}+O_{2}
ightarrow 2H_{2}O$, $H_{2}$ and $O_{2}$ are on the left - hand side, so they are reactants. $H_{2}O$ is on the right - hand side, so it is a product.

# Answer:
- First question: Decomposition
- Second question: $O_{2}$ and $H_{2}$

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