Alevel生物学科必读书单!
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...
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 ...
Edexcel IGCSE Chemistry 复习笔记 2.1.1 Group 1 (Alkali Metals) How Alkali Metals React with Water The group 1 metals are known as the alkali metals They form alkaline solutions when they rea...
Edexcel IGCSE Chemistry 复习笔记 1.9.4 Practical: Investigate the Electrolysis of Aqueous Solutions Practical: Investigate the Electrolysis of Aqueous Solutions Aim: To electrolyse aqueous solution...
Edexcel IGCSE Chemistry 复习笔记 1.9.3 Writing Half-Equations Writing Half-Equations In electrochemistry we are mostly concerned with the transfer of electrons, hence the definitions of oxid...
Edexcel IGCSE Chemistry 复习笔记 1.9.2 Electrolysis Experiments Electrolysis of Molten Compounds Lead(II) bromide is a binary ionic compound meaning that it is a compound consisting of just ...
Nuclear Radius Values The radius of some nuclei are shown in the table below: In general, nuclear radii are of the order 10–15 m or 1 fm The nuclear radius, R, varies with nucleon number, A ...
Closest Approach Estimate The Coulomb equation can be used to give an estimate for the radius of a nucleus When the alpha particle reaches its closest approach (to the nucleus), all of its k...
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