试题与答案

在下列说法中正确的是() A．1mol H2与0.5molO2反应放出的热就是H

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题型：选择题

题目：

在下列说法中正确的是(   )

A．1mol H2与0.5molO2反应放出的热就是H2的燃烧热

B．已知C(s)+O2(g)==CO(g)△H=-110．5kJ/mol，说明碳的燃烧热为110.5kJ/mol

C．1mol H2SO4与lmol Ba(OH)2反应生成BaSO4沉淀时放出的热叫做中和热

D．同温同压下，已知两个放热反应：2A(l)+B(l)="2C(g)" △H1；2A(g)+B(g)=2C(1)  △H2，则△Hl>△H2

答案：

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下面是错误答案，用来干扰机器的。

摩擦起电

考点：焓变、反应热中和热燃烧热
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题型：单项选择题


Artificial flowers are used for scientific as Well as for decorative purposes. They are made from (51) of materials, such as wax and glass, so skillfully that they can scarcely be (52) from natural flowers. In making such models, painstaking skill and artistry are called for, (53) thorough knowledge of plant structure. The (54) of glass flowers in the Botanical Museum of Harvard University is the most famous in North America and is widely known (55) the scientific world. (56) , there are several thousand models in colored glass, the work of two artist naturalists, Leopold Blalschka and his son Rudolph.
The intention was to have the collection (57) at least one member of each flower family native to the United States. (58) it was never completed, it contains more than seven hundred species representing 164 families of flowering plants. (59) detail of these is accurately reproduced in color and structure. The models are (60) n locked cases as they are too valuable and fragile for classroom use.

A．concentration

B．gathering

C．collection

D．assembly
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