#Chemistry

Sep 18

Electronic Configurations and Examples -- A-level Chemistry

Electronic Configurations: The Blueprint of Atoms Before we embark on our journey into subshells and atomic orbitals, let's revisit...

Types of molecules with polar bonds but no resulting dipole moment

Yuzhe

Jun 20, 2017

Types of molecules with polar bonds but no resulting dipole moment

There are many cases besides that of carbon dioxide where the bond polarities op- pose and exactly cancel each other. Some common types...

Yuzhe

Jun 20, 2017

Bond polarity and dipole moments

(a) The charge distribution in the water molecule. (b) The water molecule in an electric field. (c) The electrostatic potential diagram...

Periodic trends - chemistry - 离子化能量和原子半径

Yuzhe

Jun 11, 2017

Periodic trends - chemistry - 离子化能量和原子半径

Trends in ionisation energies (kJ/mol) for the representative elements. Atomic radii (in picometers) for selected atoms. Note that atomic...

The Aufbau principle and electron configurations

Yuzhe

Jun 11, 2017

The Aufbau principle and electron configurations

原子核外电子排布通常是中国学生化学学习初期的盲区。 #Chemistry

The atomic spectrum of hydrogen - chemistry/化学

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...

Standard enthalpies of formation - chemistry/化学

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

The kinetic molecular theory of gases - 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...

Balancing equations of oxidation and reduction reaction - chemistry

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

Characteristics of oxidation and reduction/氧化还原反应特征 - 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 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

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...

Atomic mass and atomic number - 元素周期表基础 - 1

Yu Zhe

May 8, 2017

Atomic mass and atomic number - 元素周期表基础 - 1

Atomic mass in periodic table is equal to ‘atomic weight’ or ‘mass number’. Its unit is called atomic mass units (amu). Atomic number in...

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