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2023年UCAS英國本科申請開啟，最全時間線整理！
現(xiàn)在AS的同學(xué)們相信一定已經(jīng)在準(zhǔn)備2023年入學(xué)的英國大學(xué)本科申請了吧！UCAS系統(tǒng)，是英國本科申請?zhí)峤坏墓俜较到y(tǒng)。從今天5月17日開始，普通本科申請通道正式開放了！ 什么是UCAS？ UCAS是大學(xué)和學(xué)院招生服務(wù)中心（...
最新！2023 U.S.News全美綜合大學(xué)排名榜單出爐
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Edexcel A Level Chemistry:復(fù)習(xí)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(fù)習(xí)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(fù)習(xí)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(fù)習(xí)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(fù)習(xí)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(fù)習(xí)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(fù)習(xí)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...
