IB DP Chemistry: SL复习笔记5.3.1 Bond Enthalpy
Bonds & Energy When bonds are broken or made enthalpy changes take place A chemical bond is a force of attraction between two atoms Breaking the bond requires the input of energy it is therefor...
IB DP Chemistry: SL复习笔记5.2.4 Using ∆Hf° to Find Enthalpy Changes
Using ∆Hf° to Find Enthalpy Changes Standard Enthalpy of Formation is defined as “The enthalpy change when one mole of a compound is formed from its elements under standard conditions” We can use e...
美国生活成本最昂贵的十个州有哪些？
全球高等教育80%以上的优质资源在欧美国家，而单美国就占了相当大一部分，美国有全世界一流的大学，这也是很多国际生选择去美国留学的重要原因。随着国内留美孩子的逐年递增，很多留学家庭对于留美的费用也非常关...
IB DP Chemistry: SL复习笔记5.2.3 Using Hess's Law - Equations
Hess's Law using Equations We can use Hess’s Law to solve unknown enthalpy changes by combining equations This requires a methodical step-by-step approach It is necessary to identify how the given ...
IB DP Chemistry: SL复习笔记5.2.2 Using Hess's Law - Cycles
Hess's Law using Cycles There are two common methods to solving Hess's Law problems, using cycles and using equations To be successful in using cycles you need to follow carefully a step-by-step pl...
IB DP Chemistry: SL复习笔记5.2.1 Hess's Law
Hess's Law In 1840, the Russian chemist Germain Hess formulated a law which went on to be known as Hess’s Law This went on to form the basis of one of the laws of thermodynamics. The first law of t...
IB DP Chemistry: SL复习笔记5.1.4 Calorimetry Experiments
Calorimetry Experiments There are two types of calorimetry experiments you need to know for IB Chemistry: Enthalpy changes of reactions in solution Enthalpy changes of combustion In both cases you ...
IB DP Chemistry: SL复习笔记5.1.3 Calorimetry
Calorimetry Measuring enthalpy changes Calorimetry is a technique used to measure changes in enthalpy of chemical reactions A calorimeter can be made up of a polystyrene drinking cup, a vacuum flas...
IB DP Chemistry: SL复习笔记5.1.2 Standard Enthalpy Change
Standard Enthalpy Change Standard conditions To compare the changes in enthalpy between reactions, all thermodynamic measurements are made under standard conditions These standard conditions are: A...
