A-level重考影響申請(qǐng)英國(guó)G5嗎？
今年的A-level大考結(jié)束了，包括國(guó)際考試局和英國(guó)本土。然而今年的形勢(shì)，小編也給大家說(shuō)了，英國(guó)打算削減A-level高分6萬(wàn)個(gè)，今年上萬(wàn)人將無(wú)緣大學(xué)錄取！考試發(fā)揮失利，或成績(jī)不錯(cuò)但報(bào)空了的同學(xué)，怎么辦？這就引出...
AP校考生和非校考生報(bào)名有什么不同？報(bào)名有什么限制和注意事項(xiàng)？
AP考試報(bào)名是分考區(qū)的，接下來(lái)會(huì)按照美國(guó)&加拿大考區(qū)、AP中國(guó)大陸考區(qū)來(lái)給大家分別說(shuō)明。 美國(guó)&加拿大考區(qū) AP校考生 學(xué)校老師會(huì)負(fù)責(zé)將考生加入AP classroom中，并且學(xué)校的coordinator也會(huì)幫考生去預(yù)定考...
AQA A Level Chemistry復(fù)習(xí)筆記5.6.5 Buffers
Acid & Basic Buffers A?buffer solution?is a solution which resists changes in pH when small amounts of acids or alkalis are added A buffer solution is used to keep the pH almost constant...
AQA A Level Chemistry復(fù)習(xí)筆記5.6.4 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 result is charact...
AQA A Level Chemistry復(fù)習(xí)筆記5.6.3 Titrations
Titrations Volumetric analysis?is a process that uses the volume and concentration of one chemical reactant (a standard solution) to determine the concentration of another unknown solution T...
AQA A Level Chemistry復(fù)習(xí)筆記5.6.2 pK?
pK? The range of values of?Ka?is very large and for weak acids, the values themselves are very small numbers Table of?Ka?values For this reason it is easier to work with another term ...
AQA A Level Chemistry復(fù)習(xí)筆記5.5.3 The Ionic Product of Water
The Ionic Product of Water 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...
AQA A Level Chemistry復(fù)習(xí)筆記5.5.2 pH & [H?]
pH & [H?] The acidity of an aqueous solution depends on the number of?H+?(H3O+) ions in solution The?pH?is defined as: pH = -log[H+] where [H+] is the concentration of hydrogen ions in m...
AQA A Level Chemistry復(fù)習(xí)筆記5.4.6 Fuel Cells
Fuel Cells A fuel cell is an electrochemical cell in which a fuel?donates?electrons at one electrode and oxygen?gains?electrons at the other electrode These cells are becoming more common in...
