Science > Chemistry > Molecule and Molecular Mass > Calculation of Number of Moles and Molecules In this article, we shall solve problems to calculate number of moles and number of molecules and atoms present in given quantity of a substance. Example 01: 3.49 g of ammonia at STP occupies 4.48 dm3. Calculate molar mass […]
Category: Chemistry
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Aromatic Compounds
Many substances isolated from resins, balsams, and essential oils possessed a fragrant smell and were found to be different from aliphatic compounds in chemical behaviour. Such substances were called aromatic compounds (Greek Aroma – fragrant smell). All aromatic compounds do not have a fragrant smell while some aliphatic hydrocarbons have a fragrant smell. Hence the […]
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Hydrolysis Constant
Science > Chemistry > Physical Chemistry > Ionic Equilibria > Hydrolysis Constant In this article, we shall study hydrolysis of different types of salts and we shall derive expression for hydrolysis constant for each type of salt. Hydrolysis of salt of strong acid and weak base. These salts on hydrolysis produce strong acids and weak […]
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SP Hybridization
Science > Chemistry > Physical Chemistry > Nature of Chemical Bond > sp Hybridization The mixing of one s – orbital and one p – orbital of the same atom of nearly same energy to form a set of diagonally arranged two identical hybrid orbitals of equivalent energy is called sp hybridization. These hybrid orbitals […]
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SP2 Hybridization
Science > Chemistry > Physical Chemistry > Nature of Chemical Bond > sp2 Hybridization Mixing of one ‘s’ orbital and two ‘p’ – orbitals of nearly same energy forming set of trigonally arranged three identical orbitals of equal energy is known as sp2 hybridization. Geometry sp2 Hybridization: The hybrid orbitals are arranged around the central atom in a […]
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Reactions of Alkanes
In last article, we studied preparations of alkenes. In this article, we shall study reactions of alkanes. Reactivity of Alkanes (Less Reactivity): Alkanes are saturated hydrocarbons. They do not contain any functional group. Hence they are less reactive. Under normal conditions, they are not acted upon by concentrated acids, alkalies, oxidising agents etc. Branched-chain alkanes […]
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Preparations of Alkanes
In the last article, we have seen what is meant by alkanes, their classification, and nomenclature. In this article we shall study preparations of alkanes by different methods. From Unsaturated Hydrocarbons: Preparations of Alkanes From Alkenes: Alkanes are obtained by passing the mixture of alkenes and hydrogen over Raney nickel (Ni), or platinum(Pt) or palladium […]
Science > Chemistry > Atomic Structure > Problems on Calculation of Number of Electrons, Protons, and Neutrons In this article, we shall study to solve problems on the calculations of the number of electrons, protons, and neutrons in atoms, molecules, and species. Example 01: Calculate the charge and mass of 1 mole of electrons. Solution: […]
Science > Chemistry > Atomic Structure > Problems Based on Atomic Number, Mass Number, and Neutron Number In this article, we shall study to solve problems based on the calculation of atomic number, atomic mass number, and neutron number Atomic number (Z) : The number of protons (positive charge) present in the nucleus of an […]
Science > Chemistry > Introduction to Organic Chemistry > Empirical and Molecular Formulae of Organic Compounds In this article, we shall study the concept of empirical formula and a molecular formula of a compound. Empirical Formula: The empirical formula of a substance represents the simplest relative whole number ratio of the atoms of each element […]