Question

1. Which process is not exothermic?
A. burning of fossil fuel
B. obtaining lime from limestone
C. radioactive decay of 2350
D. reacting hydrogen with oxygen​

Answer 1

Answer:

All spontaneous processes are not exothermic, because it is the Gibbs Free energy that determines spontaneity, not the enthalpy.

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Answer 2

Answer: B

Explanation: Calcium carbonate is found naturally in limestone. When limestone is heated strongly, the calcium carbonate it contains absorbs heat (endothermic) and decomposes to form calcium oxide (quick lime). calcium carbonate → calcium oxide + carbon dioxide

CaCO3(s) → CaO(s) + CO2 (g)