In combination reactions, what is always true?

Involve an element and a compound.

Chemistry Practice HESI A2

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Question 1

Which of the following reactions is a decomposition reaction?
1. 2H2 + O2 â†’ 2H2O
2. 2Na + Cl2 â†’ 2NaCl
3. CaCO3 â†’ CaO + CO2
4. PbCO3(s) â†’ PbO(s) + CO2(g)

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