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Showing posts from October 25, 2009

Nobel Prize

Nobel Prize is the greatest honorable prize in the world. The prize was started since 1901 as per famous Swedish scientist and dynamite inventor Alfred Nobel's will and his property. 1. How many categories are Awarded Nobel Prize? Ans: 6. Physics, Chemistry, Medicine, Literature, Economics & Peace. 2. How many institutes is Awarded Nobel Prize? Ans: 4 3. Which institute is Awarded Nobel Prize in Medicine? Ans: Karolinska Institute, Sweden. 4. Which institute is Awarded Nobel Prize in Literature? Ans: Swedish Academy. 5. Which institute is Awarded Nobel Prize in Physics, Chemistry & Economics? Ans: Royal Swedish Academy of Sciences. 6. Which institute is Awarded Nobel Prize in Peace? Ans: Nobel Committee of Norwegian Parliament, Norway. 7. How many people could maximum awarded in one category? Ans: 3 People. 8. Which category Nobel Prize could awarded both person and institute? Ans: Nobel Peace Award. 9. Did not consider f

What Is Radioactivity? What is Radiation?

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Question: What Is Radioactivity? What is Radiation ? Unstable atomic nuclei will spontaneously decompose to form nuclei with a higher stability. The decomposition process is called radioactivity. The energy and particles which are released during the decomposition process are called radiation. When unstable nuclei decompose in nature, the process is referred to as natural radioactivity. When the unstable nuclei are prepared in the laboratory, the decomposition is called induced radioactivity. Answer: There are three major types of natural radioactivity: Alpha Radiation Alpha radiation consists of a stream of positively charged particles, called alpha particles, which have an atomic mass of 4 and a charge of +2 (a helium nucleus). When an alpha particle is ejected from a nucleus, the mass number of the nucleus decreases by four units and the atomic number decreases by two units. For example: 23892U -> 42He + 23490Th The helium nucleus is the alpha particle This trefoil is the hazar

Solutions, Suspensions, Colloids, and Dispersions

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Solutions A solution is a homogeneous mixture of two or more components. The dissolving agent is the solvent. The substance which is dissolved is the solute. The components of a solution are atoms, ions, or molecules, which makes them 10-9 m or smaller in diameter. Example: Sugar and Water Suspensions The particles in suspensions are larger than those found in solutions. Components of a suspension can be evenly distributed by a mechanical means, like by shaking the contents, but the components will settle out. Example: Oil and Water Colloids Particles intermediate in size between those found in solutions and suspensions can be mixed such that they remain evenly distributed without settling out. These particles range in size from 10-8 to 10-6 m in size and are termed colloidal particles or colloids. The mixture they form is called a colloidal dispersion. A colloidal dispersion consists of colloids in a dispersing medium. Example: Milk More Dispersions Liquids, solids, and gases all may

Van der Waals Bond Definition

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Definition: A van der Waals bond is a secondary interatomic bond between adjacent molecular dipoles. A van der Waals bond may be permanent or induced. Hydrogen Bond Definition - Chemistry Glossary Definition of Hydrogen Bond Definition: A hydrogen bond is a type of attractive (dipole-dipole) interaction between an electronegative atom and a hydrogen atom bonded to another electronegative atom. This bond always involves a hydrogen atom. Hydrogen bonds can occur between molecules or within parts of a single molecule. A hydrogen bond tends to be stronger than van der Waals forces, but weaker than covalent bonds or ionic bonds. This is a basic diagram of an atom, with protons, neutrons and electrons labeled. Atom Definition: An atom is the defining structure of an element, which cannot be broken by any chemical means. A typical atom consists of a nucleus of protons and neutrons with electrons circling this nucleus. Atom Examples: hydrogen, carbon-14, zinc, cesium, Cl- (a substance can
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Adenosine Monophosphate (AMP) Adenosine monophosphate (AMP) is also known as 5'-adenylic acid. AMP is one of the nucleotides found in RNA. Mysid, wikipedia.org The molecular formula for adenosine monophosphate (AMP) is C10H14N5O7P. Adenosine Triphosphate (ATP) Adenosine 5'-triphosphate (ATP) is a nucleotide that is used to supply energy within cells. wikipedia commons

Molecular Structures

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Acetone Adipic Acid

Cloud in a Bottle Demonstration(Use Smoke to Form a Cloud)

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Here's a quick and easy science project you can do: make a cloud inside a bottle. Clouds form when water vapor forms tiny visible droplets. This results from cooling the vapor. It helps to provide particles around which the water can liquefy. In this project, we'll use smoke to help form a cloud. You can make your own cloud in a bottle using a bottle, some warm water, and a match. Anne Helmenstine Cloud in a Bottle Materials Let's Make Clouds Pour just enough warm water in the bottle to cover the bottom of the container. Light the match and place the match head inside the bottle. Allow the bottle to fill with smoke. Cap the bottle. Squeeze the bottle really hard a few times. When you release the bottle, you should see the cloud form. It may disappear between 'squeezes' The Other Way to Do It Ok, here's the ideal gas law : PV = nRT, where P is pressure, V is volume, n is number of moles, R is a constant, and T is temperature. If we're not changing the amoun