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                                       SOUND Sound :--                Sound is a form of energy which produces a sensation of hearing in our ears.   Sound waves that we can hear or sound is made up of the vibrations.   The to and fro motion of the body is called as vibration. Sound is a vibration that propagates as and acoustic wave, through a transmission medium such as solid, liquid or gas. Sound is defined as Oscillation in pressure, stress, particle displacement, particle velocity, etc., propagated in a medium with the internal forces (such as elastic or viscous) or the superposition of such propagated oscillation. The sound is the form of energy that helps in the listening of human being. And also sound is a form of the kinetic mechanical energy which moves in a form of a wave. Hertz (Hz) and Decibel (DB) are used measurement units to measure the sound.     Production of the sound? The object is vibrating and produces the sound. Vibration means a kind of rapid

  The reactivity series :-- The reactivity series is a list of metals arranged in the order of their decreasing activities. The reactivity series is also called as activity series. Reactivity series or activity series is an empirical calculated and structurally analytical progression of a series of a metals which are arranged by their reactivity from highest to lowest.   The following series known as reactivity series are given below :-- Potassium        K                                                         most reactive Sodium             Na Calcium            Ca Magnesium      Mg                                                    (Reactivity decreases from top to bottom) Aluminium        Al Zinc                   Zn Iron                  Fe Lead                 Pb Hydrogen        [H] Copper            Cu Mercury          Hg Silver               Ag Gold                 Au                                                         least reactive  

  METAL Metal is a element that has metallic bond and have positive ions or cations. Metal is a lattice of positive ions that are surrounded by the cloud of the electrons. In the pure state, metal have a shining surface. This properties are called metallic luster . Here, metals are generally hard. Metals are malleable, because they can be hammered into thin sheets. This property is called as malleability . Metals are ductile it means they can be drawn into wires. The ability of the metals to be drawn into thin wires is called as ductility . For example:--   gold is most ductile metal. Due to the properties of the ductility and malleability, metals can be given in different shapes as per their needs. Metals are opaque Metals are lustrous elements that are good conductor of heat and electricity. Metals are denser than the other substances. Metals are good conductor of heat. For example :-- silver and copper. Lead and mercury are poor conductors of heat. Metals ha

Bleaching powder   Bleaching powder is an inorganic compound by nature. its chemical formula is CaOCl 2 and also called as calcium oxychloride. It is soluble in water. Bleaching powder is prepared by the action of the chlorine on dry slaked lime (Ca(OH) 2 ) . Ca(OH) 2   + Cl 2    →   CaOCl 2    +    H 2 O   Uses for bleaching powder:--   It is used to make drinking water and remove the germs. It   is used as oxidising agent in chemical industries. It is also used for washing clothes in laundry. It is used for bleaching cotton and linen in the textiles industries. It is used for bleaching wood pulp in paper factories. It is also used for sanitization of the public swimming pools. And also it is used for disinfect the drinking water.       Properties of the bleaching powder Its chemical name is calcium hypochlorite. The formula is Ca(OCl) 2 It is also called as chloride of lime.   It is a pale yellowish powder. It   has strong smell of the

  How strong are acid or base solutions?   Acid-base indicators are used to distinguish between and acid and a base. A scale for measuring the hydrogen ion concentration in a solution is known as pH scale. pH is a scale which is used to specify the acidity or basicity of an aqueous solution. pH scale is logarithmic. The p in pH stands for Potenz in German which means that power. And it is inversely indicates the concentration of hydrogen ion in the solution. On the pH scale , pH is generally measure from 0 (very acidic) to 14 (very alkaline). The higher the hydronium ion concentration , the lower is the pH value. The solution with the pH value are neutral solution. Example:-- water. The neutral value of the pH value depends on the temperature. The solution with pH less than 7 are acidic solution. The pH value can be less than 0 for very strong acids. The solution with pH value greater than the 7 are basic solution. The pH value can be more than the 14 for strong