Edexcel IGCSE Chemistry 复习笔记 2.3.1 Composition of Air
Edexcel IGCSE Chemistry 复习笔记 2.3.1 Composition of Air Composition of Air The proportion of gases in the air has not changed much in 200 million years About four fifths of the air is nitr...
Edexcel IGCSE Chemistry 复习笔记 2.3.1 Composition of Air Composition of Air The proportion of gases in the air has not changed much in 200 million years About four fifths of the air is nitr...
Induced Fission Induced nuclear fission occurs: When a stable nucleus splits into small nuclei from the bombardment of a slow-moving neutron For example, when a uranium-235 nucleus absorbs a...
Binding Energy per Nucleon Graph In order to compare nuclear stability, it is more useful to look at the binding energy per nucleon The binding energy per nucleon is defined as: The binding ...
6月底,上海国际学校大规模招生已经告一个段落,接下来部分学校还会有招生场次和招生名额,如果对某所学校感兴趣,可以及时关注学校的官网消息。上海的21所国际学校2022-23年招生计划出炉!前不久,上海高中招生...
Nuclear Fusion & Fission Nuclear Fusion Fusion is defined as: The fusing together of two small nuclei to produce a larger nucleus Low mass nuclei (such as hydrogen and helium) can underg...
Mass Difference & Binding Energy Experiments into nuclear structure have found that the total mass of a nucleus is less than the sum of the masses of its constituent nucleons This differ...
Energy & Mass Equivalence Einstein showed in his theory of relativity that matter can be considered a form of energy and hence, he proposed: Mass can be converted into energy Energy can ...
Edexcel IGCSE Chemistry 复习笔记 2.2.2 Group 7: Reactivity & Electronic Configurations Group 7: Reactivity & Electronic Configurations When halogen atoms gain an electron during reac...
Constant Density of Nuclear Material Assuming that the nucleus is spherical, its volume is equal to: Where R is the nuclear radius, which is related to mass number, A, by the equation: Where...
最近,非常多同学学习Alevel生物。而生物作为一个探究人生奥秘的热门学科,却似乎因为专业性强,门槛高将同学们拒之于外。相信同学们都幻想过,忽然有一天学习生物变得有趣又令人着迷,再也不会枯燥了。这种想法...
Edexcel IGCSE Chemistry 复习笔记 2.2.1 Group 7 (Halogens) Physical Properties The elements in group 7 are known as the halogens These are fluorine, chlorine, bromine, iodine and astatine &nb...
Edexcel IGCSE Chemistry 复习笔记 2.1.2 Group 1: Reactivity & Electronic Configurations Group 1: Reactivity & Electronic Configurations The reactivity of the group 1 metals increases ...
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