Prefix divide by Pico- Nano- milli- 0.000‚000‚000‚001 0.000‚000‚001 0.001 centi- 0.01 deci- 0.1 deka- 10 hecto- 100 Kilo- 1‚000 Mega 1 kcal = 1000 cal 1 Cal= 1 kcal 1 cal = 4.184 1‚000‚000 • Neutral atoms contain the same number of electrons and protons. • Components of a mixture can be separated (purified) by physical means. • Physical changes alter a substance without any changes to the chemical composition. • Chemical change involves breaking
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Corrosion From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search For the hazard‚ see corrosive. Materials failure modes | Buckling | Corrosion | Creep | Fatigue | Fouling | Fracture | Impact | Mechanical overload | Thermal shock | Wear | Yielding | This box: view · talk · edit | Corrosion is the disintegration of an engineered material into its constituent atoms due to chemical reactions with its surroundings. In the most common use of the word‚ this means
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H R R Primary Alcohol(1 ̊) Secondary Alcohol(2 ̊) Tertiary Alcohol(3 ̊) Lucas reagent‚ a mixture of concentrated hydrochloric acid and anhydrous zinc chloride‚ can be used to differentiate the three classes of alcohols. Tertiary alcohol turns cloudy or appears in two layers almost immediately‚ secondary alcohol reacts within 5 to 10 minutes whereas primary alcohol reacts very slowly. Alcohol
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Germany prior to World War I‚ the development of electric lighting resulted in a large excess of calcium carbide as acetylene lamps were phased out. Fritz Klatte‚ working for Chemische Fabrik Griesheim-Elektron‚ found that acetylene can react with HCl to form vinyl chloride monomer (VCM)‚ which in turn‚ can be polymerized to PVC using free-radical initiators. Klatte was then commissioned to find uses for the hard‚ horny intractable PVC resin. He
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CBSE Class IX Term I Summative assessment I Sample paper 3 SECTION A 1. Breathing on a mirror turns mirror foggy‚ what phenomenon is responsible for this? [1] 2. What is the major function of cell wall in plant cell? [1] 3. When a carpet is beaten with a stick‚ dirt comes out of it. Why? [1] 4. (a) Name the two factors on which the buoyant force depends. [2] (b) State the relationship between the buoyant force on an object and weight of the liquid displaced by it. 5. State any two reasons for
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HKCEE Chemistry 2007 Paper 1 Section A 1. A is a compound formed from oxygen and magnesium‚ while B is a compound formed from oxygen and fluorine. a) Draw the electronic diagram of A‚ showing electrons in he outermost shells only. (1) b) Draw the electronic diagram of B‚ showing electrons in the outermost shells only. (1) c) Compare the melting points of A and B. Explains your answer. Melting point of A is higher than that of B. Ions of A are linked by strong ionic bonds /
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Parts of a prescription 1. Prescriber information: The doctor’s name‚ address and phone number should be clearly written (or preprinted) on the top of the prescription form. Some states require the doctor’s state license number to be on the form. It is not recommended that you preprint your Drug Enforcement Administration (DEA) number on the prescription pad. It becomes too easy for drug abusers to lift a few prescription forms for illicit use if that number is easily available. The DEA number is
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Chemistry Equipment Symbols 1. Test Tube 2. Boiling Tube 3. Beaker 4. Conical Flask 5. Test Tube Holder/ Tongs /Clamp Stand 6. Measuring/Graduating 7. Funnel 8. Pipette Cylinder 9. Spatula 10. Tripod 11. Bunsen Burner 12. Glass Bulb 13. Burette 16. Condenser Pipette Changes of State Filtering Solutions 03-Nov
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early atmosphere - earth roughly 4 billion yrs old - created by volcanoes erupting + releasing gases - contained mostly co2 + water vapour - earth cooled + water vapour condensed to form oceans - co2 dissolved into oceans + used to form marine organism shells which were compacted to form sedimentary rock - plants evolved to photosynthesise‚ takingin co2 + releasing oxygen - scientists don’t kno where all nitrogen came from bc they weren’t there to record evidence but most theories suggest
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ONE-SCHOOL.NET Short Notes: Form 5 Chemistry Rate or Reaction Calculation Rate of Reaction (Average Rate) Rates of reaction = Quantity change of reactants/products Total time for the reaction If the quantity change is immeasurable Rates of reaction = 1 Total time for the reaction Find the Rate From a Graph Average Rate Rates At an Instant The rate of reaction is equal to the slope of the graph The rate of reaction at an instant‚ t‚ is equal to the of quantity against
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