Category: Science

Newton’s laws of motion: First law of motion: It states that a body at rest or in motion will remain at rest or in motion unless an external force is applied on it. Second law of motion: It states that a body will accelerates, when a force is applied on it. The force applied, F = ma Where ‘F’ […]

Methane: It is an alkane (CnH2n+2) having chemical formula CH4. The methane is one of the major constituents (about 85%) of the natural gas. It has bond angle of 109.5 degrees. It is also known as marsh gas as it is found in marshy areas. Physical properties: (i) Boiling point : -162°C. (ii) Melting point : […]

LASER: LASER stands for Light Amplification by Stimulated Emission of Radiation. Types of LASER. S.No. Name of LASER Wavelength Classification on the basis of State of LASER medium Nature of Output Spectral region 1. Nitrogen laser 337 nm Gas pulsed Ultraviolet 2. Dye laser 400-900 nm Liquid pulsed/continuous Visible/Infrared 3. He-Ne laser 632.8 nm Gas […]

Hydrocarbons: These are the compounds which are composed of Hydrogen and Carbon. Each carbon atoms has four bonds. They can be saturated (single bond), unsaturated (double or triple bond), acyclic (without rings) and cyclic (with rings) Hydrocarbons can be classified as Alkanes Alkenes Alkynes Aromatic Hydrocarbons Alkanes (Paraffins): They contain single bonds. They are called saturated […]

Hard water: Water which does not produce lather with water is known as hard water. It is due to some of the salts dissolved into the water. When we treat the water with soap, it gets precipitated in the form of insoluble salts of calcium and magnesium.    CaCl2      +       2C17 H35 COONa      →          (C17 H35 COO)2 Ca   +2NaCl (From soap)            (Soap)                                    (Insoluble […]

Force: When we push or pull an object it is known as force. The force can Change the state of motion. Change the shape of body. Force is a vector quantity because it has both magnitude and direction. If a number of forces are applied in the same direction, forces are added. If two forces […]

Equations of motion: The three equations of motion are v = u + at v2 – u2 = 2aS S = ut + ½ at2 Where u = initial velocity                 v = final velocity                 S = distance covered by the object                 t = time taken to cover the distance                 a = acceleration due […]

Doppler’s effect: The siren’s pitch of a vehicle become higher as it approaches to you and become lower as it passes your position. This effect is known as the Doppler’s effect of sound. It is associated with the wave nature of light. As the vehicle approaches, the sound waves from its siren are compressed towards […]

Corrosion: Due to chemical or electrochemical attack of the environment on the surfaces of metal, compounds such as oxides, sulphides, carbonates etc are formed, which is known as corrosion. It is a slow process. Types of Corrosion: Oxidation Corrosion:The metal reacts with atmospheric oxygen in the absence of moisture to form oxides.               2M + […]