2023年AP考試報名已開啟，AP理科各科目難度系數和五分率盤點！
9月19日，美國大學理事會College Board?宣布大陸2023年AP考試報名正式開啟。在2022-23學年，大學理事會繼續與Prometric合作管理國內的AP考試報名和考務工作。很多家長和學員詢問應該報考什么科目？什么科目好學好...
2023年AP考試報名正式開啟，附報名流程！不同專業方向如何選擇報考科目？
9月19日，美國大學理事會College Board?宣布大陸2023年AP考試報名正式開啟。在2022-23學年，大學理事會繼續與Prometric合作管理國內的AP考試報名和考務工作。 美國大學先修課程(Advanced Placement)，簡稱AP課程...
2020年丘獎物理金獎作品解析
作為提交截止時間最晚的賽區，丘獎內地賽區的論文提交即將截止，剩余時間不足一周！ 作為由數學大師丘成桐先生親自發起設立的中學生科學創新類獎項，丘獎從十四年前單一的數學獎，發展到今天的數學獎、物理獎、化...
Edexcel A Level Chemistry:復習筆記6.3.4 Ligand Exchange
Ligand Exchange Ligand exchange?(or?ligand?substitution) is when one?ligand?in a complex is replaced by another Ligand exchange forms a new complex that is?more stable?than the original one ...
Edexcel A Level Chemistry:復習筆記6.3.3 Reactions of Ions in Aqueous Solution
Reactions with Hydroxide & Ammonia When transition metal ions in aqueous solution react with aqueous sodium hydroxide and aqueous ammonia they form precipitates However some of these pre...
Edexcel A Level Chemistry:復習筆記6.3.2 Chromium
Reduction & Oxidation of Chromium Species For chromium we need to consider the following standard electrode potential values We will use zinc and hydrogen peroxide as oxidising agents Th...
Edexcel A Level Chemistry:復習筆記6.3.1 Vanadium
Colours & Oxidation States Vanadium is a transition metal which has variable oxidation states The table below shows the important ones you need to be aware of Addition of zinc to the van...
Edexcel A Level Chemistry:復習筆記6.2.12 Autocatalysis
Manganese(II) ions as an Autocatalyst Autocatalysis the term used to describe a reaction which is speeded up by a product which acts as a catalyst for the reaction If you plot a rate graph o...
Edexcel A Level Chemistry:復習筆記6.2.11 Homogeneous Catalysis
Homogeneous Catalysts Homogeneous?catalyst is in the same physical state (phase) as the reactants This means they are either all gases, or more often, all in aqueous solution Homogenous cata...
Edexcel A Level Chemistry:復習筆記6.2.10 Heterogeneous Catalysis
Heterogeneous Catalysts A?heterogeneous?catalyst is in a different physical state (phase) from the reactants Heterogeneous catalysts are usually solids whereas the reactants are gaseous or i...
Edexcel A Level Chemistry:復習筆記6.2.9 Catalysis
Properties of Catalysts 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 mean...
Edexcel A Level Chemistry:復習筆記6.2.8 Haemoglobin
Haemoglobin Haemoglobin is one of nature's complexes using a transition metal ion The haem molecule is a complex with iron(II) at its centre The haemoglobin complex contains a multidentate l...
