To 语者, 

(a) When a charged rod is brought near the metal sphere without touching it, some of the positive and negative charges in the sphere are...

Like charges repel and unlike charges attract each other. A new technology based on the electric force may revolutionise the way books...

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

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

A triangle with two equal sides is called isosceles. The angles opposite the equal sides are called the base angles, and they are...

When parallel lines are cut by a transversal, three important angle relationships exist: Alternate interior angles Corresponding angles...

#GMATMaths #GREMaths

The total mechanical energy (E = KE + PE) of an object remains constant as the object moves, provided that the net work done by external...

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...

This spectrum as shown in (a), like the rainbow produced when sunlight is dispersed by raindrops, contains all the wavelengths of visible...

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...

我们通过CH4和O2反应来计算化学反应中能量的转化 #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

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...

我们用一个氧化还原反应来展示如何进行方程式配平： #Chemistry

我们看下以下的特征解释： #Chemistry

#Chemistry

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...

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

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