最新！2023 U.S.News全美綜合大學排名榜單出爐
世界權威排名機構之一 U.S. News 官方正式發布了最新的2023年美國大學排名（2023 Best College Rankings）。U.S.News一直都是業界關注度高、認可度高、極具權威性和公信力的排行榜，原因就是它的評估標準嚴謹，采...
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Edexcel A Level Chemistry:復習筆記2.3.4 Halide Ion Reactions
Halide Ion Reactions Concentrated sulfuric acid Chloride, bromide and iodide ions react with concentrated sulfuric acid to produce?toxic gases These reactions should therefore be carried out...
Edexcel A Level Chemistry:復習筆記2.3.3 Halogen Redox Reactions
Halogen Redox Reactions Reactions with Group 1 & 2 metals The halogens react with some metals to form?ionic compounds?which are?metal?halide?salts In all reactions where halogens are rea...
Edexcel A Level Chemistry:復習筆記2.3.2 Halogen Displacement Reactions
Halogen Displacement Reactions The reactivity of halogens is also shown by their?displacement?reactions?with other halide ions in solutions A?more?reactive?halogen can displace a?less reacti...
Edexcel A Level Chemistry:復習筆記2.3.1 Group 7 Trends
Physical Properties The Group 7 elements are called?halogens The halogens have uses in water purification and as bleaching agents (chlorine), as flame-retardants and fire extinguishers (brom...
Edexcel A Level Chemistry:復習筆記2.2.5 Flame Tests
Flame Tests Metal ions produce a?colour?if heated strongly in a flame Ions from?different?metals produce?different?colours The flame test is thus used to identify metal ions by the colour of...
Edexcel A Level Chemistry:復習筆記2.2.4 Group 2 Carbonates & Nitrates
Group 2 Carbonates & Nitrates Thermal decomposition?is the breakdown of a compound into two or more different substances using?heat Thermal decomposition of carbonates The Group 2 carbon...
Edexcel A Level Chemistry:復習筆記2.2.3 Group 2 Hydroxides & Sulfates
Group 2 Hydroxides & Sulfates Group 2 hydroxides Going down the group, the solutions formed from the reaction of Group 2 oxides with water become more?alkaline When the oxides are dissol...
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Group 2 Elements Reactions with water and oxygen The reaction of group 2 metals with oxygen follows the following general equation: 2M (s) + O2?(g) → 2MO (s) Where M is any metal in group 2 ...
Edexcel A Level Chemistry:復習筆記2.2.1 Explaining Group 2 Trends
Ionisation Energy Chemical trends All elements in Group 2 (also called?alkali earth metals)?have two electrons in their?outermost principal quantum shell All Group 2 metals can form?ionic?co...
