2. 职称英语
  3. Dalton wondered why the heavier and lighter gases in the atmosphere did not sepa

Dalton wondered why the heavier and lighter gases in the atmosphere did not sepa

游客2024-03-02  19
问题 Dalton wondered why the heavier and lighter gases in the atmosphere did not separate as oil and water do. He finally concluded that the constituent【S1】______ must exist in the form of【S2】______ particles or atoms and that these must be completely mixed together in the【S3】______ . This threw a new light in the laws of definite proportions. It was only necessary to suppose that the atoms could combine into small groups of uniform【S4】______ and so form more complex substance; thus the mystery of this law was【S5】______ . Dalton suggested, for example, that carbon monoxide is formed by the one with one【S6】______ of atoms of carbon and oxygen, while carbon dioxide results from a single【S7】______ of carbon uniting with two atoms of oxygen. Assuming this to be true, then the definite proportions of Prout’s law (for all chemical compounds the different constituents【S8】______ enter in unvarying proportions) would naturally【S9】______ the relative weights of the many【S10】______ kinds of atoms.

A measure      B structure      C things       D unite
E oxygen       F different      G solved       H atmosphere
I discovered   J gases          K describe     L atom
M tiny         N always         O pairing [br] 【S6】
选项
答案 O
解析 pair这里是“匹配，配成双”的意思
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