考試將近！2022年CIE秋季大考各科時(shí)間點(diǎn)！
在關(guān)注夏季成績的同時(shí)，也不能忘了秋季考試和報(bào)名關(guān)鍵時(shí)間點(diǎn)，尤其是準(zhǔn)備秋季參加考試的同學(xué)，CIE十月大考將近，一起來看看報(bào)考重要時(shí)間節(jié)點(diǎn)和Alevel、IGCSE各科考試時(shí)間吧。 報(bào)考的關(guān)鍵時(shí)間節(jié)點(diǎn) 2022年報(bào)名截止...
Edexcel A Level Chemistry:復(fù)習(xí)筆記5.2.6 Titration Curves
Drawing & Interpreting Titration Curves During a titration a pH meter can be used and a pH curve plotted A pH curve is a graph showing how the pH of a solution changes as the acid (or ba...
Edexcel A Level Chemistry:復(fù)習(xí)筆記5.2.5 Measuring and Comparing pH
Measuring and Comparing pH Strong and weak acids The relative strengths of different acids can be determined by measuring the pH of equimolar aqueous solutions of the acids, at the same temp...
Edexcel A Level Chemistry:復(fù)習(xí)筆記5.2.4 Ionic Product of Water
Ionic Product of Water, Kw In all aqueous solutions, an equilibrium exists in water where a few water molecules dissociate into protons and hydroxide ions We can derive an equilibrium consta...
Edexcel A Level Chemistry:復(fù)習(xí)筆記5.2.3 Acid Strength
Acid Dissociation Strong acids A?strong acid?is an acid that?dissociates?almost?completely?in aqueous solutions HCl (hydrochloric acid), HNO3?(nitric acid) and H2SO4?(sulfuric acid) The posi...
Edexcel A Level Chemistry:復(fù)習(xí)筆記5.2.2 pH
Defining pH The acidity of an aqueous solution depends on the number of?H+?ions in solution The?pH?is defined as: pH = -log[H+] where [H+] is the concentration of hydrogen ions in mol dm–3 S...
Edexcel A Level Chemistry:復(fù)習(xí)筆記5.2.1 Br?nsted–Lowry Acids & Bases
Br?nsted–Lowry Acid & Base Theory The Br?nsted-Lowry Theory?defines acids and bases in terms of proton transfer between chemical compounds A?Br?nsted acid?is a species that can donate a ...
Edexcel A Level Chemistry:復(fù)習(xí)筆記5.1.3 Reaction Conditions & The Equilibrium Constant
Temperature & the Equilibrium Constant Changes in temperature?change?the equilibrium constants?Kc?and?Kp For an endothermic reaction such as: ???An increase in temperature: ???[H2] and [...
Edexcel A Level Chemistry:復(fù)習(xí)筆記5.1.2 Equilbrium Constant Calculations
Equilibrium Constant Calculations Calculations involving?Kc In the equilibrium expression each figure within a square bracket represents the concentration in?mol dm-3 The?units?of?Kc?therefo...
