Purpose: To investigate the difference between physical and chemical changes in matter. Materials: Safety glasses 13 small test tubes Test tube rack Test tube holder 2 100-mL beakers Funnel Watch glass Stirring rod Evaporating dish Magnet Magnifying glass Crucible tongs Spatula Balance Meeker burner Ring stand Iron ring Wire gauze Forceps Sulfur Iron filings Sodium Bicarbonate Sodium Chloride Sugar Sand Magnesium ribbon Hydrochloric Acid Distilled water Filter paper
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Title: Physical and Chemical Properties Purpose: To investigate the physical and chemical properties of pure substances as distinguishing characteristics. Procedure: 1. Set up a well plate with 24 pieces and fill two with either Dilute HCl or Dilute NaOH. 2. Set up four test tubes with any single substance in each one. 3. Observe and record original color and odor of substance. 4. Light flame with matches. -Hold test tube with substance in it over flame with clamps -Observe and record
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9/23/2014 Experiment # 3 Purpose: the purpose of this experiment was to explore the distinctions between physical and chemical properties and between physical and chemical changes. Lab questions: 1. Based on my observation CaCl2 is soluble in water. 2. When 15% of HCl was added to CaCl2 as the teacher was performing the experiment I observed and realized some changes took place physically. It was physical change because the color was clear. 3. By adding 15% of HCl of CaCo3 ‚ made it change chemically
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you observer any chemical changes in this experiment? Yes. CuCo2 turned green when I applied heat to it. B. What evidence did you use to decide that something was a chemical change? I viewed my other test tubes to see if it there was a chemical change in those. C. Give at least two examples of chemical changes you observed. Zn and MgO when I Diluted HCL D. Classify the following properties of sodium metal as physical or chemical: • Silver metallic color: Physical • Turns gray in
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PHYSICAL SCIENCE physical change-changes affecting the form of a chemical substance‚Physical changes are used to separate mixtures into their component compounds Example:breaking glass Chemical changes- when a substance combines with another to form a new substance ‚called chemical synthesis. Example: burning wood Law of Conservation of Mass-The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations
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pros and cons of weathering steel:: "Weathering" means that due to their chemical compositions‚ these steels exhibit increased resistance to atmospheric corrosion compared to unalloyed steels. This is because the steel forms a protective layer on its surface under the influence of the weather. The corrosion-retarding effect of the protective layer is produced by the particular distribution and concentration of alloying elements in it. The layer protecting the surface develops and regenerates
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rises to the Earth’s surface between the two plates. The middle of the Red Sea and the mid-ocean ridge (running the length of the Atlantic Ocean) are divergent plate boundaries. Divergent boundaries are characterized by a rift in the surface of the earth along the midocean ridges that exist in all of the major ocean basins. The ridges are composed of volcanic mountains that erupt basalt onto the surface of the ocean and by that process create new oceanic crust. The almost constant eruption of basalt
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A Sport that has been played for decades. Football is among the greatest sports played in history. That’s why it’s called America’s game. However‚ in the past few years‚ the sport has become very dull and unentertaining. The NFL has implemented rules and regulations that have taken the excitement from the sport. Some changes that can counter that‚ and make things more interesting. Stop taking away celebrations out of the game‚ Add more contact (bring the sport back to a contact sport)‚ and stop calling
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everyone inevitably experiences insecurity towards their body image. In one of her most famous poems‚ ’Weathering’‚ Fleur Adcock addresses her own personal experience with the standards of beauty. She begins the poem with a strong critical tone‚ natural imagery and interesting figurative descriptions in order to associate and connect her most recurring themes of nature and place. Adcock opens ’Weathering’ with the candid lines: "Literally thin-skinned‚ I suppose‚ my face/catches the wind off the snow
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History Assessment: How Has WW1 Been Remembered? WW1 has‚ and always will be seen as one‚ if not the most significant war in all of history. One of the reasons for it being such a tragic event was that it was deemed at the time to have been ‘the war to end all wars‚’ however that tragically was not the case. World War One was caused by several contributing factors‚ which resulted on Britain declaring war on Germany. They are: The alliance system‚ Imperialism‚ The Naval Race‚ The Schlieffen Plan
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