究竟哪一个才是最具权威的世界大学排名？
关于大学排名信息不实早已不是鲜见的新闻，每一次各大世界大学排行榜一发布，总是会引发各路人士激烈的讨论。有人乐于分享自己学校的好成绩，也有人怒于声讨和质疑排名的准确性。那这五花八门的各大排行榜单中，...
IB DP Chemistry: HL复习笔记13.1.4 Catalytic & Magnetic Properties
Catalytic Properties Transition metals are often used as catalysts in the elemental form or as compounds The ability of transition metals to form more than one stable oxidation state means that the...
IB DP Chemistry: HL复习笔记13.1.3 Complex Ions
Complex Ions Transition element ions can form complexes which consist of a central metal ion and ligands A ligand is a molecule or ion that forms a co-ordinate bond with a transition metal by donat...
认可度相对较高的国际竞赛有哪些？
许多学生一听到比赛就感到非常害怕，所以今天我们将帮助你整理5个部分的10个比赛，非常适合进入比赛，这些比赛有强大的认可，在国际知名度和认可度相对较高，可以说“性价比”超高了！认可度相对较高的国际学术活动...
IB DP Chemistry: HL复习笔记13.1.2 Variable Oxidation States
Variable Oxidation States When transition elements forms ions they lose electrons from the 4s subshell first This is because when the orbitals are occupied, the repulsion between electrons pushes t...
IB DP Chemistry: HL复习笔记13.1.1 Transition Elements
Transition Elements Transition metals are elements with an incomplete d-subshell or that can form at least one stable cation with an incomplete d-subshell This definition distinguishes them from d-...
IB DP Chemistry: HL复习笔记12.1.2 Ionisation Energy Trends
Trends Across a Period Ionisation energies show periodicity – a trend across a period of the Periodic Table As could be expected from their electron configuration, the group 1 metals have a relativ...
IB DP Chemistry: HL复习笔记12.1.1 Emission Spectra & First Ionisation Energy
Convergence Limits on an Emission Spectrum Emission Spectra Electrons move rapidly around the nucleus in energy shells Heat or electricity can be used to excite an electron to a higher main energy ...
IB DP Chemistry: HL复习笔记11.2.6 Analysing Graphs
Analysing Graphs The gradient of a graph can be found by: In the case of a straight line graph: using a triangle and the equation for a straight line In the case of a curve: drawing a tangent to th...
