In this lab‚ we were given three experiments. We had to go through steps and make observations for each‚ but in the end we had to decide whether the experiment had a chemical or physical change. A physical change can alter the state of matter‚ but not the substances identity. A chemical change transforms a substance from one identity to another. It is important to identify the difference between physical and chemical changes in any lab because you want to know the process of what is going on. The
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11th Grade Chemistry Honors Which Type of Water is the Hardest? Hardness is the quality in water that is imparted by the presence of dissolved salts‚ especially calcium and magnesium. Hardness refers to how many mineral particles there are in water. The harder the water is‚ higher the contents of minerals. A geologist is a person who specialized in geologic research and study; a hydrologist is a geologist that studies the circulation‚ distribution‚ and properties of the waters of the earth and
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at a lower temperature then the paraffin wax. This ingredient is usually a pyrophoric metal(metals which ignite at extremely low temperatures). MAGNESIUM is the most commonly used pyrophoric metal in trick candles‚ with the magnesium flakes embedded in the wicks. When you blow out the candle‚ the wick that remains is hot enough to light off the magnesium and the burning process continues. Polygamy (one man several wives) has been in practice for several thousand years. But did you know even Polyandry
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numerous of parameters studying‚ such as‚ the temperature distribution‚ the friction and the defects in transient process should be investigated in the simulation /Wil02/. Therefore‚ in this study‚ the transient model for ALE simulation of aluminum (magnesium) extrusion process is built‚ to compare with the practical experimental
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PHYSICAL PROPERTIES OF THE PERIOD 3 OXIDES These pages explain the relationship between the physical properties of the oxides of Period 3 elements (sodium to chlorine) and their structures. Argon is obviously omitted because it doesn’t form an oxide. A quick summary of the trends The oxides The oxides we’ll be looking at are: |Na2O |MgO |Al2O3 |SiO2 |P4O10 |SO3 |Cl2O7 | | | | | |P4O6 |SO2 |Cl2O
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Thermochemistry: An Ice Calorimeter Determination of Reaction Enthalpy D. F. Nachman 6/23/2010 Abstract: An ice calorimeter was used to study the reaction of magnesium metal and 1.00M sulfuric acid solution: Mg(s) + H2SO4(aq) →MgSO4(aq) + H2(g). We found the experimental molar enthalpy of reaction to be ΔH = –355 ± 17 kJ/mol at 0°C‚ 24% lower than the textbook value of ΔH° = –466.9 kJ/mol‚ reported at 25°C. Introduction Whether a chemical reaction occurs spontaneously or is driven by an outside
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of our bodies are made up of only four elements‚ oxygen‚ carbon‚ hydrogen‚ and nitrogen. The other 3 percent is filled with 20 other elements‚ which are needed to live. Some of those elements are calcium‚ phosphorus‚ potassium‚ sulfur‚ sodium‚ magnesium‚ and many more. In the circulatory system‚ two elements that are critical to the circulatory system are iron and oxygen‚ without these two elements it would be impossible for the system to function. The circulatory system is an organ system that
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Introduction Naturopathy‚ by definition is “a system of medicine based on the healing power of nature.” Naturopathic doctors (ND) believe in the natural healing power of body. They strive to understand the mind‚ body and spirit as a whole. Their healing techniques include; diet changes‚ the use of herbs‚ mineral and vitamin supplements‚ therapeutic exercise‚ massage‚ acupuncture‚ Chinese medicine‚ and minor surgery. The practices of using natural healing remedies have been around forever‚ but
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--------------------------1 Filter paper --------------------------------------------------------------------------------Several Stand and Clamp ---------------------------------------------------------------------------------1 Chemicals: Magnesium sulphate-7-hydrate--------------------------------------------------------------18g 2.0M ammonia solution-------------------------------------------------------------------500cm3 75% propanal-2-ol----------------------------------------------------------------------------20cm3
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Strategy I am investigating how the rate of reaction differs when we change the concentration of Hydrochloric Acid whilst reacting with Magnesium. The rate of reaction is explained by the Collision Theory. This theory explains how various factors affect the reaction rates and how chemical reactions occur. The 4 factors of the Collision Theory are: • Temperature • Concentration • Surface area • Catalyst I am investigating how different concentrations of acids affect the rate of reaction. However
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