Calculating Rates of Reaction To measure the?rate of a reaction, we need to be able to measure either how quickly the reactants are used up or how quickly the products are formed The method ...
Collision Theory & Rates Collision Theory When reactants come together the kinetic energy they possess means their particles will collide and some of these collisions will result in chem...
Bond Enthalpy Definitions 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 ...
Constructing Hess Cycles 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 ...
Calculating Energy Transferred, Q Measuring enthalpy changes Calorimetry?is the measurement enthalpy changes in chemical reactions A simple?calorimeter?can be made from a?polystyrene drinkin...
Enthalpy Level Diagrams The total chemical energy inside a substance is called the?enthalpy?(or heat content) When chemical reactions take place, changes in chemical energy take place and th...
Enthalpy Change Definitions To be able to compare the changes in enthalpy between reactions, all thermodynamic measurements are carried out under standard conditions These standard condition...
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聊到美國大學(xué)排名，家長們的第一印象就是U.S. News或QS。 但由于近年來數(shù)據(jù)造假的丑聞，U.S. News排名陷入了不少爭議，其準(zhǔn)確性和合理性也遭到了一定的質(zhì)疑。 《Washington Monthly（華盛頓月刊）》就打著和U.S. ...
