IB DP Chemistry: HL復(fù)習(xí)筆記18.1.1 Lewis Theory
Lewis Theory of Acids & Bases A more general definition of acids and bases was given by G.N. Lewis who defined them as: A Lewis?acid?is an?electron pair acceptor A Lewis?base?is an?electron pai...
IB DP Chemistry: HL復(fù)習(xí)筆記17.1.2 Gibbs Free Energy & the Equilibrium Constant
Gibbs Free Energy & the Equilibrium Constant Gibbs Free Energy & the Equilibrium Constant The equilibrium constant,?Kc, gives no information about the individual rates of reaction It is ind...
IB DP Chemistry: HL復(fù)習(xí)筆記17.1.1 Applying the Equilibrium Law
Explaining Le Chatelier’s Principle Le Chatelier's principle Le Chatelier's principle says that if a change is made to a system at?dynamic equilibrium, the position of the equilibrium moves to mini...
英國A-level大考成績或?qū)⒀悠诠迹@對中國的國際學(xué)校考生有何影響？
近日，英國《衛(wèi)報》報道，由于AQA考試局宣布72小時罷工，今年夏天的GCSE 和 A - level 考試分數(shù)或?qū)⑼七t發(fā)布。這對中國的國際學(xué)校考生有何影響？ 考試局罷工，大考成績延遲發(fā)布？ 據(jù)《衛(wèi)報》報道，AQA考試委員會...
IB DP Chemistry: HL復(fù)習(xí)筆記16.2.3 Activation Energy from Rate Constants
Activation Energy from Rate Constants at Different Temperatures Arrhenius Plots Arrhenius plots for two reactions with different activation energies can be drawn on the same graph Arrhenius plots f...
IB DP Chemistry: HL復(fù)習(xí)筆記16.2.2 Graphing the Arrhenius Equation
Graphing the Arrhenius Equation Finding the Activation Energy Very often, the Arrhenius equation is used to calculate the activation energy of a reaction A question will either give sufficient info...
IB DP Chemistry: HL復(fù)習(xí)筆記16.2.1 The Arrhenius Equation
The Arrhenius Equation The rate equation shows how each of the reactants in a reaction effects the rate of the reaction and it includes the rate constant,?k However,?k?only remains constant if the ...
IB DP Chemistry: HL復(fù)習(xí)筆記16.1.5 Mechanism Problems
Mechanism Problems Chemical kinetics can only?suggest?a reaction mechanism, they cannot prove it However, they can be used to disprove a proposed mechanism Elementary steps are the steps involved i...
NSS官方發(fā)布2022年英國大學(xué)滿意度調(diào)查結(jié)果！
近日全英學(xué)生調(diào)查 (NSS) 發(fā)布了2022年英國大學(xué)滿意度調(diào)查結(jié)果，324329名學(xué)生參加了調(diào)查，英國每所大學(xué)都會參與NSS，還有一些學(xué)院和其他高等教育機構(gòu)也參與其中。 英國學(xué)生辦公室 (OfS) 表示，NSS收集學(xué)生對課程質(zhì)...
IB DP Chemistry: HL復(fù)習(xí)筆記16.1.4 Rate Determining Step
Molecularity & Rate Determining Step Rate-determining step & intermediates A chemical reaction can only go as fast as the slowest part of the reaction So, the?rate-determining step?is the s...
IB DP Chemistry: HL復(fù)習(xí)筆記16.1.3 Graphical Representations
Graphical Representations of Reaction Order Reaction Order Using Concentration-Time Graphs In a?zero-order?reaction, the concentration of the reactant is inversely proportional to time This means t...
IB DP Chemistry: HL復(fù)習(xí)筆記16.1.2 Rate Constants
Rate Constants The?rate constant, (k), of a reaction can be calculated using the initial rates and the rate equation Calculating the rate constant from the initial rate The reaction of sodium carbo...
