column or page – find all choices before answering. 001 10.0 points Elements can be distinguished by their 1. hardness. 2. transparency. 3. dissolves in carbon disulfide 4. density of 2.07 g/ml 005 10.0 points Which of these substances I) table salt II) the liquid called coffee III) mercury is a mixture? 3. brittleness. 1. II and III only 4. density. 2. All of these 3. None of these 002 10.0 points An example of a chemical change is 4. II only 1. swallowing bread. 5. I and III only 2. digesting
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overall risk might be lessened. 1. Installing a smoke detector that uses a radioactive capsule to detect particles in the air. In 2006 it was estimated that more than 80% of the standard smoke detectors in the US had americium-241‚ a radioactive element with a life span of 432 years. Is this enough to cause concern? Having one or two smoke detectors that contain a radioactive capsule is nothing to be concern about. However‚ if one was smart enough and willing to invest the time‚ as Mr. David Hahn
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Chemical Reactions and their Classifications 26 October 2012 Abstract: Ordinary laboratory ware was used to determine how many of what type of chemical reactions occurred. This yielded three decomposition reactions‚ four substitution reactions‚ and three metathesis reactions. Introduction There are many different types of chemical reactions in the study of chemistry; A composition reaction (also known as synthesis) is defined as the reaction that occurs when two single compounds combine in
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This experiment was performed to demonstrate a cycle of chemical reactions involving copper. This lab will start with copper as a reactant in the first reaction through a series of five chemical forms of aqueous phase reactions and ending to calculate the percentage of recovered solid copper as a product in the last reaction of the experiment. The experiment resulted in a percent recovery from the cycle of copper reactions of an increase to 139%. . Introduction: The purpose of this experiment is
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of mining‚ Müller’s task was to analyze several different ore samples. In 1782 while viewing a gold ore‚ he soon discovered the chemical element‚ Tellurium. After analyzing the ore‚ Müller first came to the conclusion that it was Antinomy alloyed in there‚ but quickly realized it wasn’t. “The metal he had produced wasn’t antimony at all‚ but a previously unknown element.”(Steven Gagnon) Because tellurium is found in various ores and contains the same properties as metals and nonmetals‚ it confused
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Naming Chemical Compounds General Information: Scientists all around the globe use a standard method for naming chemical compounds. The standards were set up by an international committee sponsored by the International Union of Pure and Applied Chemistry (IUPAC). Having this standard makes life easier for people who use these compounds everyday. It would be tough to set up any experiment if scientists everywhere used different names for the same compound. It would also make the lab a
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everyday‚ and our current energy source‚ fossil fuels‚ releases gases into the environment‚ but with energy from stars‚ it could be a fresh start for our energy sources and our environment. Stars are made from a mix of gases‚ and are powered by chemical energy and nuclear fission. Nuclear fission is a atomic reaction that happens in the core of stars‚ mostly converting hydrogen to helium‚ but it requires a lot of energy. Nuclear burning is
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Chemical Bonding and Structure In his essay I will be discussing the scientific background and explanation of chemical bonding and structure‚ I will also be describing the method of injection molding and its benefits and limitations and how it is superior to the previous methods of making plastic. Finally I will also list the implication effect of plastic and its effect (economically and environmentally) A chemical bond is the result of a lure (attraction) between atoms or ions
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data or measurements Physical change: a change in which the composition of the substance does not alter and no new substances are produced Chemical property: a characteristic or attribute of a substance that is determined based on its ability to undergo changes to its composition to produce 1 or more substances Chemical Property Detail: Colour New unexpected colour produced Odour New unexpected odour produced Bubbles Bubbles appear not caused by heating Precipitation
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Ionic Bonds Essay The periodic table is a masterpiece of organized chemical information. It is a table of the chemical elements in which the elements are arranged by order of atomic number. The standard form of the table includes periods (horizontal rows in the periodic table) and groups (vertical rows in the periodic table). Atoms are the basic building blocks of ordinary matter. Atoms are made up of particles called protons‚ electrons‚ and neutrons. Protons carry a positive electrical charge‚
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