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mooncake9090
27.06.2019 •
Chemistry
Which of the following combinations will result in a reaction that is never spontaneous?
positive enthalpy change and positive entropy change
positive enthalpy change and negative entropy change
negative enthalpy change and positive entropy change
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Ответ:
Positive change in enthalpy and negative change in entropy.
Explanation:
Remember that any spontaneous process must lead to a net increase in entropy.
When ΔH>0 and ΔS>0, the reaction proceeds spontaneously at high temperatures and proceeds spontaneously in the reverse direction at low temperatures.
When ΔH>0 and ΔS<0, the reaction proceeds spontaneously in the reverse direction.
When ΔH<0 and ΔS>0, the reaction proceeds spontaneously at all temperatures.
When ΔH<0 and ΔS<0, the reaction proceeds spontaneously at low temperatures and proceeds spontaneously in the reverse direction at high temperatures.
Ответ:
it is d 3yz2 – 3z2 – 5y + 7
Step-by-step explanation: