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卡片总数: 2 张•内容版本: v4•公开卡包•更新时间: 8/1/2026
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#1
正面 (问题)
give 2 reasons why enthalpy changes calculated from average bond enthalpies are not standard enthalpy changes
背面 (解答)
actual bond enthalpies for bonds broken and bonds made may be different than average bond enthalpies alcohols and water are liquids under standard conditions. bond enthalpies apply to gases
#2
正面 (问题)
state what is meant by the term average bond enthalpy. explain why you would expect the actual C=O bond enthalpy to be different in CO2 and H2C=O
背面 (解答)
the energy needed to break one mole of a specific type of bond in a gaseous molecule the bonds are in different environments.