【题文】The atomic weight of oxygen is___than ___of the hydrogen.A. 15 times heavier; that B. 15 times heavier: those C. 16 times as heavier; that D. 16 times as heavy; those 相关知识点: 试题来源: 解析 【答案】A 【解析】试题分析:考查倍数表达法。句意:氧原子是氢原子重量的16...
试题来源: 解析 1、答案:A 解析: 考查倍数表达法和指示代词。句意:氧的原子量是氢的原子量的 16 倍(氧的原子量比氢的原子量重 15 倍)。 15 times heavier 符合倍数表达法:倍数+比较级+than,that 指代前面提到的不可数名词 weight,可知选 A。 反馈 收藏 ...
【题目】The atomic weight of oxygen is___than ___of the hydrogen. A. 15 times heavier; that B. 15 times heavier: those C. 16 times as heavier; that D. 16 times as heavy; those试题答案 在线课程 【答案】A 【解析】 试题分析:考查倍数表达法。句意:氧原子是氢原子重量的16倍。is 16...
R. (2003). “Edward Williams Morley and the Atomic Weight of Oxygen: The Death of Prout's Hypothesis Revisited.” Annals of Science 60: 351–372.Hamerla, R. R. (2003) “Edward Williams Morley and the Atomic Weight of Oxygen: The Death of Prout's Hypothesis Revisited.”. Annals of ...
With the exception of hydrogen, no atomic weight is less than 2x, if the atomic weight of oxygen is taken as the standard. There is, accordingly, some justification for treating the atomic weights of helium, boron, carbon, nitrogen, oxygen, and fluorine as normal and that of hydrogen as ...
The elements defined the atomic mass unit as '1/16th of the atomic weight of oxygen'. Apart from the fact that the term mass should have been used instead of weight, this definition does not specify which oxygen isotope, and implies the average mass of an oxygen atom in the mixture of ...
THE discovery of the complexity of oxygen clearly necessitates a reconsideration of the scale on which we express the weights of atoms. Owing to the occurrence of Oand O, now generally accepted, it follows that the mean atomic weight of this element, the present chemical standard, is slightly...
The computed worth of the material depends on the atomic weights used in the calculations. The original standard of atomic weight, established in the 19th century, was hydrogen, with a value of 1. From about 1900 until 1961, oxygen was used as the reference standard, with an assigned value...
The original standard of atomic weight, established in the 19th century, washydrogen, with a value of 1. From about 1900 until 1961,oxygenwas used as the reference standard, with an assigned value of 16. The unit of atomic mass was thereby defined as1/16the mass of an oxygen atom. In ...