role. The next discovery was the atomic theory by John Dalton‚ who at first called the atomic weights “the relative weights of ultimate particles”. His atomic theory was the revolutionary system that described the relationship between atoms and elements. Atoms combining into molecules was another discovery found when Gay Lussac saw that the gases produced twice the volume when combining equal volume of different gases. In 1811‚ Amedeo Avogadro realized that the assumptions that gases remain of single
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a French chemist‚ revolutionized chemistry in the late 1700’s. He repeated many of the experiments of earlier chemists but interpreted the results far differently. Lavoisier paid particular attention to the weight of the ingredients involved in chemical reactions and of the products that resulted. He found that the weight of the products of combustion equals that of the original ingredients. His discovery became known as the law of the conservation of matter. Lavoisier noted that the weight of
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Experiment 1: Observations of Chemical Changes Abstract: In the lab 1 experiment‚ the objective was to observed properties of various chemical reactions between twelve different basic compounds. Each reaction revealed chemical properties consisting of color change‚ CO2 gas formation‚ and/or precipitate formation. Certain reactions made it possible to distinguish between an acid and a base. Through the results of this experiment‚ chemical properties observed in the reactions could be used to associate
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Isotopes of Paperclipium Purpose: To determine the isotopic composition of the element‚ paperclipium. Background Information: Isotopes are atoms of the same element with the same proton number but different mass number; that is‚ the number of neutrons differ. Isotopes of the same element have the same electronic configuration as they have the same number of electrons. This accounts for the fact that their chemical properties are the same‚ as the react similarly. However‚ their physical properties
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sickness and certain outbreaks can be prevented. In turn‚ this creates a safer more stable environment. 2. Describe how the table of elements is ordered and discuss four common elements in living organisms. Elements are ordered on the Table by their atomic number. This is also the number of protons in the atomic nucleus. The four most common elements in living oprganisms are Hydrogen‚ Carbon‚ Nitrogen‚ and Oxygen. (VanMeter‚ VanMeter‚ & Hubert‚ n.d.‚ p.20). 3. Describe the pH scale
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Geology 101—Lesson 2 Assignment 1. What is meant by "hydrogen is the simplest of all elements"? Because hydrogen has an atomic number of only “1” which means it only has one proton in its nucleus and it is the only element with only one proton in its nucleus also has one electron 2. What must happen in order for an atom to lose its electrical neutrality? In order for an atom to lose its electrical neutrality the protons and electrons
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Chapter 2 Atoms and the Periodic Table / Elements and the Periodic Table * An element is a pure substance that cannot be broken down into simpler substances by a chemical reaction. * Each element is identified by a one- or two-letter symbol. * Elements are arranged in the periodic table. * The position of an element in the periodic table tells us much about its chemical properties. Atoms and the Periodic Table / Elements and the Periodic Table Atoms and the Periodic
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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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was believed to be the chemical that changed base metals into silver or gold‚ also referred to as the power of projection. Kraft one of the followers of Brandt‚
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contain a periodic table of the elements. It required the immense research and determination of the scientist Dmitri Mendeleev to show us that all elements followed a natural form and provided us with the first decent periodic table. There are 111 elements recognised today by IUPAC and they are arranged in the periodic table in horizontal groups and vertical periods. The eight groups consist of the alkali metals‚ the alkaline earth metals‚ the transition elements‚ metalloids‚ non-metals‚ the halogens
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