Classify each of the following processes as exothermic or
endothermic and indicate the sign of ΔH.
butane gas burning in a lighter
the reaction that occurs in a chemical cold pack often used to
ice athletic injuries
the burning of wax in a candle
Answer
1)
butane gas burning in a lighter
------------------------> exothermic and ΔH is
negative
2)
the reaction that occurs in a chemical cold pack often
used to ice athletic injuries --------> endothermic, ΔH is
positive
3)
the burning of wax in a candle
------------------------> exothermic and ΔH is
negative
explanation
:
burning reaction means it is combustion reaction and all
combustion reactions are exothermic in nature.
for exothermic reactions deltaH is negative and fro endothermic
reaction deltaH is positive
