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Biology

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Hi guys,
need help with homework...got some done, but not sure about these thanks for any help! :)
Take a balloon filled with hydrogen gas. Touch a match
to the balloon. What happens? Big boom and lots of heat
given off. Is ΔH favorable or unfavorable?? It would be favorable as its going out to the environment, right?
Add solid urea to a beaker of water. The beaker gets very cold.
Is ΔH favorable or unfavorable???
Unfavorable as there would be no net heat lost, right?

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