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3-7 反应温度对反应的主要影响是什么? 温度对反应速率和反应平衡均有影响。一般来说,温度升高,可以使反应速 率加快。可应用 Arrhenius 公式求出反应速率的温度系数与活化能之间的关系, k=A e -E/RT 。 但对于爆炸反应、催化加氢或酶反应以及一些反常反应,温度对反应 速率的影响不符合 Arrhenius 公式。 温度与化学平衡的关系:放热反应,ΔH<0,降低温度利于反应进行; 吸热反应,ΔH>0,升高温度利于反应进行。
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举一反三
【简答题】Replace the underlined words in the first group with the words from the second group.
【简答题】Matching the first group of words with the explanation of these words in the second group.
【单选题】The world's elderly population will exceed that of children by 2060, when each group ________ to account for about one fifth of the population. [ ]
A.
expects
B.
will expect
C.
is expected
D.
will be expected
【单选题】( ) are a group of words and expressions that refer to the personal, temporal or spatial characteristics of the context within which a text is produced.
A.
Nouns
B.
Adjectives
C.
Verbs
D.
Deictics
【简答题】在全球国际旅游人次总量中，为什么近距离的国际旅游会占绝大比重？
【简答题】在全球国际旅游人次总量中，近距离的国际旅游何以会占绝大比重?
【简答题】Match words in group 1 with other words in group 2.
【简答题】We know the effect calories have on your body.For each pound of weight that your body carries,it takes about 12 calories per pound per day to keep it alive.If you weigh 150 pounds,you therefore need a...
【单选题】Tomorrow the mayor is to a group of Canadian businessmen on a tour of the city. [ ]
A.
cooperate
B.
accompany
C.
coordinate
D.
associate
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