Complete the following statement: When a glass rod is rubbed with silk cloth‚ the rod becomes positively charged as a) negative charges are transferred from the rod to the silk. b) negative charges are transferred from the silk to the rod. c) positive charges are created on the surface of the rod. d) positive charges are transferred from the silk to the rod. e) positive charges are transferred from the rod to the silk. 21.3.1. Complete the following statement: When a glass rod is rubbed
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Introduction:- Pollutants in the air threaten the lives of everything living on earth. They cause acid rain and smog‚ weaken the ozone layer‚ increase the chances of cancer and contribute to changing the climate of the world. Pollutants can be invisible and often we don’t even realize that we’re making them. Polluted air travels with the wind‚ affecting all of us‚ whether or not we are responsible for it. Smog aggravates heart and respiratory diseases. Acid rain erodes buildings‚ hurts
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structure. Larger amount of energy is needed to overcome the stronger electrostatic attraction between Rb+ and its mobile electrons than the weaker van der Waals’ forces between Kr atoms . Hence‚ boiling point of Rb is higher than that of Kr. b) AlF3 and PF3 AlF3 has a giant ionic structure and PF3 has a simple molecular/ covalent structure. Larger amount of energy is needed to overcome the stronger electrostatic attraction between Al3+ and F( ions in AlF3 than the weaker intermolecular
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electric charge * Static charge – electric charge at rest‚ stays on and eventually discharged or lost to other objects/air * Discharge – remove excess static charge so the object is neutral * Static charge last long when air is dry * Electrostatics – study of static electric charge * Benjamin Franklin demonstrated lightning is a form of electricity by flying a kite during a thunderstorm * Kite made out of silk and had pointed wire tip 30cm to draw “electric fire” * Flew
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Contents A. INTRODUCTION 2 Green Building 2 About Air & Odor Management (AOM) 2 1. AIR CLEANING AND PURIFYING 3 1.1. Air purifier 3 1.2. Fresh air system 3 1.3. Ceiling mounted electronic air cleaner 3 1.4. KITCHEN EXHAUST ELECTROSTATIC AIR CLEANER 4 2. ODOUR CONTROL 5 Examples: 5 Portable odour buster: Air Mist System Model provides a rugged portable solution to eliminate unwanted odours. 5 Mist spray unit: for odour control 5 Ecolo air solution: air solution
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1‚ radiation processing method The main advantage of the thorium content of the different rare earth minerals and gangue minerals in the ore‚ the use of the gamma-ray concentrator to separate rare earth minerals and gangue mineral. The radiation processing method used for the preselection of the rare earth ore. At present‚ this method is not widely applied in industry. 2‚ the gravity separation method The use of different rare earth minerals and gangue mineral density separation. The re-election
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Bonding structure Metals: metallic bonding Ionic compound (metal +nonmetal): ionic bonding Molecule (nonmetal +nonmetal): covalent bonding 3.1 Metallic Bonding 1) Definition The electrostatic attraction between a lattice if positive ions and delocalized electrons. 2) The strength of metallic bonding (depend on) Delocalized electrons (=valence electrons=Group number) More valence electrons‚ stronger metallic bonding Ionic radii (=distance between nucleus and e-) Greater ionic radius
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colloidal system consists of two separate phases: a dispersed phase (or internal phase) and a continuous phase (or dispersion medium). A colloidal system may be solid‚ liquid‚ or gaseous. Many familiar substances are colloids‚ as shown in the chart below. As well as these naturally occurring colloids‚ modern chemical process industries utilize high shear mixing technology to create novel colloids. The dispersed-phase particles have a diameter of between approximately 5 and 200 nanometers.[2] Such
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charges can help prevent sparks near flammable fuels. Paint sprayers work better if the object and the paint have different charges. Photocopiers use electrostatic principles in their operation. Grounding wires prevent damage to electrical equipment. Electrostatic precipitators work by creating charged waste particles and using electrostatic attraction to remove the particles. A simple way to prevent static build-up on a car is to use a ground strap Airplanes use static wicks to prevent it
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Ink jet computer printers Well‚ I’m going to talk about ink jet computer printers‚ that I believe everybody knows‚ because we use them almost every day. I will present you what types of ink jet printers we know and how works each of them. After my presentation or at home you should do the exercises‚ I (mr. somebody) gave you. We know different types of ink jet printers like thermal ink jets‚ piezoelectric ink jets and continuous ink jets. Each of them works in a different way. Most of
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