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From personal experience, describe whether these processes are endothermic or exothermic. Give a reason for each.
a. A charcoal briquette burns.
b. Ice melts.
c. Water evaporates from your skin.
d. Wood burns.
Answer:
a. Exothermic. A charcoal briquette releases heat as it burns.
b. Endothermic. Water absorbs the heat essential for evaporation from your skin, and your skin feels cooler.
c. Endothermic. Ice absorbs the essential heat from the environment to melt.
d. Exothermic. Wood releases heat as it burns.
Initially 5 mol of an ideal gas with Cv,m=12.5 J K^-1 mol^-1 are at a volume of 5 dm^3 and a temperature of 300K. If the gas is heated to 373 K and the volume changed to 10 dm^3, w
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