The Principle of Conservation of Mechanical Energy Mechanical Energy - physics/物理
The total mechanical energy (E = KE + PE) of an object remains constant as the object moves, provided that the net work done by external...
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Yuzhe
Jun 7, 2017
Apparent weight - physics/物理
A person whose true weight is 700 N steps on the scale. If the elevator is at rest or moving with a constant velocity (either upward or...
Yuzhe
Jun 7, 2017
The atomic spectrum of hydrogen - chemistry/化学
This spectrum as shown in (a), like the rainbow produced when sunlight is dispersed by raindrops, contains all the wavelengths of visible...
Yuzhe
Jun 7, 2017
Coal conversion - chemistry/化学
碳元素无疑整个地球中最重要的元素，而煤炭也是碳元素在🌍中最重要的表现形式。 Coal gasification. Reaction of coal with a mixture of steam and air breaks down the large...
Yuzhe
Jun 7, 2017
Standard enthalpies of formation - chemistry/化学
我们通过CH4和O2反应来计算化学反应中能量的转化 #Chemistry
Yu Zhe
Jun 5, 2017
The kinetic molecular theory of gases - chemistry
在化学或物理热学里掌握以下三种定律是最为关键的，记忆每一种方程式是徒劳的，因为你的瞬时记忆会很快消失。但如果你能对每一种定律的图解产生联想，那么学习的效率就会显著性提高。 #Chemistry
Yu Zhe
Jun 1, 2017
Pressure - chemistry/physics
The unit mm Hg (millimeter of mercury) is often called the torr in honor of Torricelli. The terms torr and mm Hg are used interchangeably...
Yu Zhe
Jun 1, 2017
Balancing equations of oxidation and reduction reaction - chemistry
我们用一个氧化还原反应来展示如何进行方程式配平： #Chemistry
Yu Zhe
Jun 1, 2017
Characteristics of oxidation and reduction/氧化还原反应特征 - chemistry
我们看下以下的特征解释： #Chemistry
Yu Zhe
Jun 1, 2017
Oxidation and reduction - chemistry
#Chemistry
Yu Zhe
May 26, 2017
Acid-base titrations - Chemistry/化学
以下描述是整个酸碱滴定实验的英文解释： The titration of an acid with a base. (a) The titrant (the base) is in the buret, and the flask contains the acid...
Yu Zhe
May 25, 2017
GRE - Maths
面对这道不定式最快的解决方式依然是我们之前讲解过的代入法。x=2，A 有可能，x=- －1/2，B 有可能。x = －2，C不可能。所以最终的答案为B。 #GREMaths #GMATMaths
Yu Zhe
May 25, 2017
GRE - Maths
解决这类的数学题最好的方法就是选择代入法当r=1时，Quantity B is greater，当r=10时，Quantity A is greater，所以选项 D是正确答案。 #GREMaths #GMATMaths
Yu Zhe
May 22, 2017
Precipitation - Chemistry - 沉淀反应
Reactant solutions: (a) Ba(NO3)2(aq) and (b) K2CrO4(aq). 如果大家尝试将分子式以离子形式展开，那么沉淀反应就会变得更容易理解了。 #Chemistry
Yu Zhe
May 19, 2017
Electronegativity - 电负性 - Chemistry
负电性的理解会帮助我们对分子内的作用力更好的理解，而这也恰恰是中国学生比较难理解的地方。 The different affinities of atoms for the electrons in a bond are described by a property...
Yu Zhe
May 17, 2017
Dilution - 溶液稀释
关于溶液稀释问题遵循的基本原则就是mole doesn't change at all。 Water is then added to achieve the molarity desired for a particular solution. This process...
Yu Zhe
May 16, 2017
Wood produces alcohol - 化学实验
Wood can undergo decomposition to produce methyl alcohol. Procedure 1. Set up the distillation apparatus as shown in Figure 2. As you do,...
Yu Zhe
May 10, 2017
Physics - Newton’s First Law of Motion
Definition of Inertia and Mass Inertia is the natural tendency of an object to remain at rest or in motion at a constant velocity. The...
Yu Zhe
May 10, 2017
Chemistry - mole and mass
我们来解决下mole 和 gram之间的关系是怎样的： 首先我们看下mole的英文定义：the mole as the number equal to the number of carbon atoms in exactly 12 grams of pure carbon...
Yu Zhe
May 9, 2017
Table manners - 高级词汇
我们来看下几个国家的餐桌礼仪： Dine _________ In the Phillippines, it’s considered good ______ to eat all the food on your plate. In Afghanistan,...
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