Metal ions emitting aviolet-colored flame has the largest amount of energy while those that emit red-colored flamehave the least amount of energy. Introduction An atom is the smallest particle of an element‚ which can exist and still have theproperties of the elementElectrons determine the chemical properties of atoms. The electrons in an atom exist inlayers called shells or energy levels. The negatively charged particles of an electron are kept inorbit in the energy levels. Normally‚ atoms do
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Department of Chemistry Observations of Chemical Changes Submitted by Date Submitted: 5/30/2012 Date Performed: 5/30/2012 Lab Section: Chem-181DL1 Course Instructor: Purpose The purpose of the experiment Observation of Chemical Changes is to examine the properties of chemical reaction and relate those reactions to products commonly found in a home environment. Through this experiment someone can macroscopically analyze whether a solution
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II. LEARNING OBJECTIVES - To perform different types of chemical reactions including acid-base‚ precipitation‚ gas forming‚ complex compound forming and oxidation-reduction reactions. - To identify some of the products in these reactions and describe the chemical changes. - To write and balance the chemical equations for the reactions observed. III. EQUIPMENT AND REAGENTS 1. EQUIPMENTThirty test tubes One test tube rack Two test tube holders Two spatulas Three 250 mL beakers One stirring rodOne
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Citrine is also considered a symbol of hope‚ youth‚ health‚ and fidelity. In ancient times‚ citrine was carried as a protection against snake venom and evil thoughts. Other names for citrine are Imperial Topaz‚ Oriental Topaz‚ and Precious Topaz. A chemical
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brighter‚ emitting more and more energy. 9. An element is a pure chemical substance consisting of one type of atom distinguished by its atomic number. Hydrogen‚ carbon‚ lithium‚ oxygen‚ and arsenic are all elements what differentiates them all from each other is that they may be part of different groups of the periodic table and more importantly‚ their atomic number. 11. It allows us to see the energy state of the atom and to decipher what element it is‚ if necessary. 13. Because the Doppler
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Introduction Fish kills are common in natural water systems near mining operations. A major fish-kill took place in the Clark Fork in 1984. These fish kills are due to unnaturally high salinity‚ which is toxic to the indigenous fish species‚ caused by group IA and IIA metal ions in the water. As the mine’s waste seeps into the water supply‚ the salinity‚ and thus toxicity to the fish‚ increases as the various metals dissolve. In this experiment a simulated water sample from Clark Fork‚ or portion
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CHEMISTRY Safety‚ Matter‚ and Measurement Lab Safety Dress appropriately Follow directions and act appropriately Know where emergency equipment is MSDS Material Safety Data Sheets- contain safety information about chemicals Converting metric units Kilo Hecto Deca Base Deci Centi Milli 1000 100 10 1 1/10 1/100 1/1000 Significant Figures NOT Significant Digits “Placeholders”- Zeros before the decimal point and after the number
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in many parts of the world. In 1922‚ the Haaxman brothers brought the first neon signs to Holland. And in 1932‚ the first neon signs reached the United States. Neon is a nonmetal. Neon is the second element in Group 18 of the periodic table. Neon is in the element family the Noble gases. This element contains 10 Protons & Electrons
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36.1% water I. Chemical Formula a. Empirical formula i. the simplest ratio of the atoms present in a molecule or compound ii. lowest number of atoms in a formula * Examples of empirical formula N2H4 = NH2; C6H6= CH 1. Steps: Based on % composition in each element‚ find: i. Mass ii. Mole iii. Divide each mole by lowest mole value iv. Whole number ratio of each element 2. Examples:
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of the pressures of the parts” (Unknown). The first part of Dalton’s atomic theory was published in 1808‚ and the second was in 1810. This theory can be summarized into five main points: “(1) atoms are tiny particles that make up elements; (2) atoms of a certain element are
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