IB DP Chemistry: HL復習筆記19.1.5 Free Energy & Eo
Free Energy & Eo Previously we have seen the concept and term?free energy,?ΔGθ Free energy is a measure of the available energy to do useful work and takes into account the?entropy?change, ΔSθ,...
IB DP Chemistry: HL復習筆記19.1.4 Quantitative Electrolysis
Quantitative Electrolysis Michael Faraday showed, in 1833, that the amount of products obtained is dependent on the quantity of electrical charge passed through the cell Electrical charge is a meas...
IB DP Chemistry: HL復習筆記19.1.3 Electrolysis of Aqueous Solutions
Electrolysis of Aqueous Solutions We have seen previously how simple binary compounds can be electrolysed when molten and the products of electrolysis can be predicted using our knowledge of the io...
2023美本申請季來臨，美國大學ED/EA/RD/ED2申請時間截點和政策了解一下！
對于2023屆的學生來說，從大學調研、選校，到ED/EA/RD/ED2申請時間截點，再到文書、個人陳述等材料的準備......一系列的時間、任務、要求，已經伴隨著申請季的開始悄然而至。清晰了解美國大學不同階段申請的時間...
IB DP Chemistry: HL復習筆記19.1.2 The Standard Hydrogen Electrode
The Standard Hydrogen Electrode The absolute value of a half cell potential cannot be measured, only differences in potential between pairs of half-cells. For this reason, it is necessary to have a...
IB DP Chemistry: HL復習筆記19.1.1 Electrochemical Cells
Electrochemical Cells We have seen previously that?redox?reactions involve simultaneous?oxidation?and?reduction?as electrons flow from the?reducing agent?to the?oxidizing agent Which way electrons ...
IB DP Chemistry: HL復習筆記18.2.2 Acid & Base Problem Solving
Acid & Base Calculations pH The acidity of an aqueous solution depends on the number of?H3O+?ions in solution pH?is defined as: pH = -log [H3O+] Where [H3O+] is the concentration of?H3O+?ions i...
IB DP Chemistry: HL復習筆記18.2.1 Acid & Base Dissociation Constants
Acid & Base Dissociation Constants Weak acids A?weak acid?is an acid that?partially?(or incompletely)?dissociates?in aqueous solutions For example, most carboxylic acids (e.g. ethanoic acid), H...
IB DP Chemistry: HL復習筆記18.1.5 Salt Hydrolysis
Salt Hydrolysis An ionic salt is formed from the neutralisation reaction of an acid and base Neutralisation? The ionic salt, MA, formed will dissociate in water Hydrolysis?is where water is used to...
IB DP Chemistry: HL復習筆記18.1.4 Buffers
Buffers A?buffer solution?is a solution which resists changes in pH when small amounts of acid or base are added A buffer solution is used to keep the pH almost constant A buffer can consist of?wea...
IB DP Chemistry: HL復習筆記18.1.3 Indicators
Indicators An?acid-base?indicator?is a weak acid which dissociates to give an anion of a different colour Consider a weak acid, HIn: HIn (aq)? + H2O (l)? ? H3O+?(aq) + In–?(aq) colour 1? ? ? ? ? ? ...
IB DP Chemistry: HL復習筆記18.1.2 pH Curves
pH 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 base) is added The features of a pH curve ...
