particle of an element‚ that atoms of different elements have different masses‚ and that they are solid‚ indestructible units - much like a billiard ball .He called his model the " Billiard Ball model" because he thought that atoms looked like billiard balls from pool. Dalton’s Atomic Theory included five main points. Atoms: Make up all matter. Cannot be subdivided‚ created‚ nor can they be destroyed. They can simply be rearranged into different groups. Of a given element are identical‚
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Radioactive isotopes (radioisotopes) are isotopes which are atoms of the same element that are chemically identical but vary in the number of neutrons they contain. Radioactive isotopes can participate in reactions just like non radioactive elements. Autoradiography is a technique used to trace the movements of certain substances around plants. An example of this is carbon 14. Carbon 14‚ a radioactive isotope‚is added to the carbon dioxide supply of the plant‚ to study the movement of products
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Beryllium Beryllium is a stolid and atomic number 4. Beryllium atomic mass is 9.012182. Beryllium electrons pre shell are 1‚ 2. Beryllium is a chemical element with the symbol of Be. Beryllium was discovered by Louis Nicolas Vauquelin in 1797. Beryllium metal point is 2‚348 F. Beryllium is a steel gray and hard metal that is brittle. The discovery of beryllium was Louis Nicolas Vauquelin. Louis discovered beryllium in 1797. The place beryllium was discovered was in France. The metal was isolated
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Elements‚ Mixtures and Compounds An element is a pure substance made of one type of particle (atom). Particles can join up with other particles of the same type to form molecules. Examples: Hydrogen = H2 . This means there are two atoms of hydrogen joined together to form a molecule of hydrogen gas. Oxygen = O2‚ Nitrogen is H2‚ Chlorine is Cl2. A compound is a pure substance of two or more elements chemically combined together in a set ratio. Example: Water = H20 this means there are always
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FORMAL LAB REPORT INTRODUCTION John Dalton’s atomic theory states that elements combine in simple numerical ratios to form compounds. A compound‚ no matter how it is formed‚ always contains the same elements in the same proportion by weight. The law of mass conservation states that mass can neither be created nor destroyed. In this experiment‚ the mass of the metal was not destroyed or created; the metal’s mass was simply changed into a compound form once the gas
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1. What is Chemistry? The study of the composition‚ structure‚ and properties of matter. The processes that matter undergoes and the energy changes that accompany these processes. 2. What is the formula for density? If I give you the density of a substance and the volume‚ you should be able to tell me the mass… Density = Mass/Volume 3. Compare and contrast intensive and extensive properties. Give an example of each. Extensive properties depend on the amount of matter that is present. Such
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the works of Henry Moseley. Moseley was a student at the University of Manchester right before World War I broke out. Moseley had the ingenious idea to start studying elements by hitting them with an electron beam. At only 25 years old Moseley had figured out the problems chemists had been having for centuries‚ how to order the elements on the periodic table.
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Under that it is then classified as an element or a compound. How do you know if it’s an element? Well look at the periodic table of elements if its on there then it’s an element. How do you know if its a compound? Well a compound is made up of two or more elements. So look at the name for example NH3 then it is a compound because it has a nitrogen molecule and 3 hydrogen molecules. Science changes everyday and without our current knowledge of the elements and classifing matter then who knows
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Discuss the impact of Alchemy on the modern science of Chemistry. At the first time human being have found gold - a rare and the most valuable element in the world‚ people are attracted by its shiny and glowing appearance. They are trying to find different ways turning those ordinary base metals into worthy gold. This kind of transformation process started at the Middle Ages‚ named as Alchemy‚ was the initiation of the modern science of Chemistry. Alchemy is a difficult and complicated subject
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Procedure Access the virtual lab and complete the experiments. Part One (Flame Test): 1. Create and complete a data table for Part One of the lab. It should include the name of the element (or unknown) examined and the color of the observed flame: Barium-green Calcium-red Sodium-yellow Rubidium-purple Potassium-blue Lithium-pink 2. Identify each unknown from Part One of the lab and briefly explain why you identified each unknown as you did.: Unknown 1-yellow. I think it is Sodium because
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