• Exothermic reactions: lose energy and involve bonds forming; ΔH is negative
• Endothermic reactions: gain energy and involve bonds breaking; ΔH is positive
Without doing any calculations, predict the sign of ΔH for each of the following reactions:
(b) 2 H(g) → H2(g)
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Our data indicates that this problem or a close variation was asked in Chemistry: The Central Science - Brown 14th Edition. You can also practice Chemistry: The Central Science - Brown 14th Edition practice problems.