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J.J. Thomson's Cathode Ray Tube Experiments

Thomson's all three experiments are discussed. He studied magnetic and electric properties of cathode rays and determined the mass-to-charge ratio of the electron.
10 min read

Mass Concentration

Mass concentration is a volumetric measure like molarity. It is the ratio of the mass of a solute to the volume of solution.
10 min read

Molality

Molality is a concentration that tells how much a solute is present per kg of the solvent.
9 min read

Molarity

Molarity is an important concept in analytical chemistry. Many calculations of chemistry involves molarity.
11 min read

Mole Fraction

The mole fraction of a substance in the mixture is the ratio of the mole of the substance in the mixture to the total mole of the mixture. Since it is the ratio of moles to moles, it is a dimensionless quantity. The mole fraction is sometimes called the amount fraction.

11 min read

Mass Fraction

The mass fraction of a substance in a mixture is the ratio of the mass of the substance to the total mass of the mixture. It is also known as mass per cent or percentage by mass when expressing in percentage. Since the mass fraction is a ratio of mass to mass, it is a dimensionless quantity.

13 min read

Empirical Formula

The empirical formula is the formula formed by atoms of a compound (or a molecule) such that atoms of an element are in the simplest relative ratio.

22 min read

Percentage Composition

A compound is a pure substance made up of different elements. So, it consists of atoms of different elements. Examples of compounds are water (H2O), carbon dioxide (CO2), hydrogen chloride (HCl), sulphuric acid (H2SO4), potassium hydroxide (KOH), methane (CH4), acetic acid (CH3COOH). All these compounds contain at least two atoms of elements.

10 min read

Molar Mass

In chemistry, the molar mass is an important quantity. It measures the mass of a mole of a given substance.

32 min read

Units of Pressure

The pressure is a widely used quantity; it is found in physics, chemistry, engineering, and biology. Because of the wide usage of pressure, it has adopted various units to express it. And it is necessary for us to know the relationship between various units of pressure.

30 min read

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