Chemistry Notes Cracking: * 2 types of Cracking; Catalytic cracking and Steam/thermal cracking. * Catalytic cracking‚ using a catalyst called Zeolite (Aluminosilicate)‚ 500 degrees C‚ in the absence of air and at pressures just above atmospheric * Thermal cracking is done without a catalyst; steam is passed through very hot metal tubes at 700-1000 degrees C at just above atmospheric pressure. * This is used to break down longer chains of unsalable hydrocarbons into smaller salable
Premium Atom Chemistry Atmosphere
Chemistry in Photography Background A photograph is an image made by a photo-chemical reaction which records the impression of light on a surface coated with silver atoms. The reaction is possible due to the light-sensitive properties of silver halide crystals. Equation form for silver halides: Ag + + e - Ag Species produced include: Ag2+‚ Ag2o‚ Ag3+‚ Ag3o‚ Ag4+‚ Ag4o In 1556‚ the alchemist Fabricius was the first to discover that light can photochemically react with these crystals to
Premium Silver Photography Photographic film
I Term Exam Chemistry Project Sunday‚ January 13‚ 2013 Grade/Section: Date: Question I: State whether each statement is true or false‚ then correct each incorrect statement. (7pts‚ 1 point each) 1- An Element is a substance that can be broken down into simpler substance by chemical means. 2- The Aufbau Principle states that energy levels must be filled from the highest to the lowest‚ when writing the election configuration. 3- Atomic radius decreases across a period
Free Periodic table Atom Chemical element
1.LIFE FOR US IS BETTER THAN IT WAS FOR OUR FOREFATHERS. This world is moving toward more development since its inception. Long days before people were living in caves and eating raw foods. When stone era moved forward then wooden homes cam and cooked food. Wooden era passed and semi developed era came; people became educated and followed many philosophies.After many years of philosophical era‚ a developed era came and people reached the moon. Now we are in well developed
Free Science Religion Economics
Elisa Hofmeister Kokesh Hour 3 AP Chemistry 5-29-12 The Chemistry of Coffee Green Coffee- Before coffee is roasted‚ it is referred to as “green coffee”. The green coffee is primarily made up of caffeine‚ lipids‚ carbohydrates‚ proteins (amino acids)‚ and organic acids (although inorganic acids exist in coffee as well). These groups are quite stable in the green phase‚ and it is the carbohydrates‚ proteins‚ and acids that will undergo significant reactions during roasting to produce coffee
Premium Acid Carboxylic acid Coffee
by : Directorate of Education‚ Delhi SOME IMPORTANT REASONING BASED QUESTIONS OF ORGANIC CHEMISTRY 1. Chlorobenzene is less reactive than chloromethane. Ans. In chlorobenzene‚ each carbon atom of benzenering is sp2 hyridised and is electron withdrawing. Chlorine atom donates a lone pair of electron and acquire positive charge. The negative charge is delocalised on ortho and para position by resonance. C-Cl bond acquires partial double bond character and is 169 pm as compared to 17.0 pm in chloromethane
Premium Alcohol Carboxylic acid Oxygen
Our So Called High School Life By: Mekai Veterans say that the most exciting and happiest moments on a student’s life happen in high school. Honestly speaking‚ I don’t believe in this before. Ask me why? Easy‚ just because I can’t feel it! I thought‚ when I first had the knowledge about it‚ everything was absurd or let’s just say it’s true to “some” but not to “all.” But lately‚ when I tried to reminisce my past years as a student‚ starting from kindergarten when I keep praying for fevers
Free High school College Education
The positive effects of smart phone in our life Do you know how smart phones are important in our lives? Nowadays‚ everyone is practically has one cell phones‚ and smart phones are gradually occupying a big part of it. In recent years‚ smart phones have a rapid and tremendous development (Chang‚ Chen & Hao‚ 2009).Correspondingly‚ all the cell phones’ industry are having intense competition‚ so they made smart phones not only have the original function‚ but also have a lot of new works that make
Premium Mobile phone Smartphone Cellular network
UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Level *0281936391* CHEMISTRY Paper 5 Planning‚ Analysis and Evaluation Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams‚ graphs or rough working. Do not use staples‚ paper clips‚ highlighters
Free Chemistry Concentration Water
Standardize a solution of potassium manganate(VII) by an iron (II) salt (ammonium iron (II) sulphate) Introduction Oxidation numbers describe the number of electrons the atom will gain or lose during a reaction. Each atom in an equation can be assigned an oxidation number according to certain rules. If the oxidation number of an atom increases as you go from the left side to the right side if an equation‚ oxidation has occurred (electrons have been lost); if the oxidation number decreases
Premium Potassium permanganate Manganese Oxidizing agent