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Q - 1)    Define Hydrogen and write down uses, physical? Hydrogen:   Hydrogen            A colorless, highly flammable gaseous element, the lightest of all gases and the most abundant element in the universe, used in the production of synthetic ammonia and methanol, in petroleum refining, in the hydrogenation of organic materials, as a reducing atmosphere, in ox hydrogen torches, and in rocket fuels. Atomic number 1; atomic weight 1.00794; melting point -259.14°C; boiling point -252.8 °C; density at 0 °C 0.08987 gram per litter; valence 1. Physical Properties of Hydrogen: 1.     It is a colorless, odorless and tasteless gas. 2.     It is insoluble in water and highly inflammable gas and burns with blue flame. 3.     Its bond dissociation energy is 104 k. cals/mol and ionization energy is 13.54 eV. 4.     It liquefies at -252 °C and freezes at -259 °C. 5.     Electro negativity of hydrogen is 2.1. Uses of Hydrogen:   It is used in manufacture of ferti

Notes Class 9 Science Karachi : COMPUTER CHAPTER 5http://facebook.com/AES.pk : COMPUTER CHAPTER 5 http://facebook.com/AES.pk

English Book IX   http://facebook.com/AES.pk

English Book IX http://facebook.com/AES.pk 

The Error   “Could Not Install On  USB Storage   Or SD Card” error on Android phones apparently occurs when something goes wrong with the installation of an app and temp file is left on your  Android OS  . There is a work around and a fix for this problem. The Work Around: Unmount your  SD card   Install the app Mount   your SD card Move the app to the SD card This is really harming. Now fixing it. The Fix: It really work I used it my EVO Tab very nice help for All of US Connect your phone to your PC as a  mass storage device   Backup important data Find or Search   the folder named “.android_secure” Inside it, delete the file called “smdl2tmp1.asec” Disconnect your phone Install the App you were trying to instal