Natural Science 12 ATOM DEVELOPMENT WITH SCIENTISTS INVOLVED 400 B.C. - Democritus’ atomic theory posited that all matter is made up small indestructible units he called atoms. Democritus expanded the idea to state that matter was composed of small particles called "atoms" that could be divided no further. These atoms were all composed of the same primary matter with the only differences between them being their size‚ shape and weight. The differences in these characteristics explained the differences
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Three things are usually required for a chemical explosion: a chemical reaction that occurs very rapidly‚ a large increase in gas pressure‚ and a confined-reaction vessel in which the pressure of the gaseous products can increase to a point that the gases break violently out of the container. In this chemistry and physics science fair project‚ you will use the combustion of ethanol to provide energy for a small explosion. The chemical equation that describes the combustion of ethanol is shown below
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Subatomic particles Main article: Subatomic particle Though the word atom originally denoted a particle that cannot be cut into smaller particles‚ in modern scientific usage the atom is composed of various subatomic particles. The constituent particles of an atom are the electron‚ the proton and the neutron. However‚ the hydrogen-1 atom has no neutrons and a positive hydrogen ion has no electrons. The electron is by far the least massive of these particles at 9.11×10−31 kg‚ with a negative
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Ever wondered why organic foods are more expensive? Why organic foods are kept separately from the other food in a grocery store? Why some produce has special labels? The food all looks the same on the outside. An apple marked organic looks the same as any other apple in the produce section of the store. The difference is not the outward appearance but how the apple was grown and processed. The word organic gives the impression that the food will be safer and more nutritious to eat than food without
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What is Organic Food and Why Should I Care? In today’s world‚ there are an exorbitant amount of meal choices and food options. We are constantly searching for nutritious foods so that we may live healthy lives. In regard to purchasing healthy foods‚ organic food is growing in popularity due to an increased concern for food safety and environmental protection. Organic food refers to crops or livestock that are grown on the farm without the application of synthetic fertilizers‚ pesticides
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Balancing chemical equations 1. Complete the following sentences‚ using the words or groups of words in the box below. You may use some words more than once. |• as small as possible |• decrease |• molecules |• quantities | |• balance |• different |• nature |• rearranging | |• bonds |• equal
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Kr has a simple molecular structure and Rb has a giant metallic 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
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5 Beautiful Examples of Organic Architecture Ads by Google ’India Is’ Video Contest Show Us What India Is in a 5 min Video. Submit & Win Great Prizes! youtube.com “…in an organic architecture‚ that is to say an architecture based upon organic ideals‚ bad design would be unthinkable.” -Frank Lloyd Wright What is Organic Architecture? Frank Lloyd Wright incorporated the term "organic" into his architectural philosophy in about 1908. But he wasn’t thinking about farmer’s markets and pesticide-free
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5- A FISCHER ESTERIFICATION SYNTHESIS OF PEAR OIL One of the major uses of Esterification (C(=O)-C-R) is forming compounds with different odors which can be used to make different synthetic and natural flavorings. Using the chemical and physical properties of organic compounds‚ an ester was catalyzed from the reaction of a carboxylic acid with an alcohol‚ producing an odor similar to that of pear oil. The mechanism of this Fischer- Esterification process is outlined as follows:
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13. ORGANIC CHEMISTRY IV) ALKYNES SYNOPSIS Alkynes are commonly known as acetylenes. Acetylene is the simplest and important member of the alkyne series. • Alkynes contain – C ≡ C – • General molecular formula of alkynes is CnH2n–2 • Triple bonded carbons are ‘sp’ hybridized and greater s – character is associated with it. • Alkynes will exhibit chain‚ position and functional isomerism. • Their functional isomers are alkadienes and cyclo alkenes. • The minimum number of carbons required to exhibit
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