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Chemical Changes Lab

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Purpose The purpose of this lab is to distinguish the difference between physical and chemical properties and changes. Background A physical property is a characteristic of matter that can be changed without changing the mater’s composition. Examples include the odor of a substance, the color, its volume, its state of matter, density and melting and boiling points. A chemical property is a characteristic that determines how the composition of matter changes as a result of contact with other matter or the influence of energy. It is a characteristic that describes the behavior of matter. These include flammability, burning, rusting and toxicity. A physical change changes the form of a substance, but not its chemical composition. Physical changes …show more content…

Investigation H: During this investigation, the following changes were noted: the two solutions foamed and bubbled, and basically “exploded” outside of the graduated cylinder. Conclusion The purpose of this lab is to observe the differences between physical and chemical properties and physical and chemical changes. To test these differences, we conducted different experiments and concluded whether the reaction was a physical or chemical change. Investigation A: The chlorine from the copper chloride combined with the aluminum foil to create aluminum chloride. The dark substance left on the bottom of the beaker was copper. An exothermic reaction occurs, causing the temperature of the beaker to increase. It is a chemical reaction because two new substances are formed: copper and aluminum chloride. The chemical composition is changed, meaning the chemical formula changed from 3 CuCl2 + 2 Al to 2 AlCl3 + 3 Cu (David’s Digital Portfolio). Investigation B: NaCl is soluble in water, which caused the salt to dissolve into the water. It is a physical reaction because evaporating the water leaves the salt …show more content…

When the penny was placed in the flame of the bunsen burner, the copper melted and revealed the zinc, so it changed from a copper-color to silver. The color change is an example of a physical property, while the whole reaction is a chemical change. Investigation D: The magnesium reacts with oxygen in the air, and the bunsen burner is a source of heat for the reaction. When this reaction occurs, Magnesium Oxide is formed, making it a chemical change. Investigation E: Copper(II) sulfate is soluble in water. Through evaporation, the water and crystals can be separated, making this a physical change. Investigation F: Lead (II) nitrate and potassium iodide solution (KI) formed potassium nitrate and lead iodide, which is yellow precipitate. This is a chemical change because two new substances were

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Once the material was acquired, 1.0094 grams of Aluminum were weighed and then transferred to a 250mL beaker. The 250mL beaker continued to remain in use for the next few steps. 1.4M KOH solution was added to the Aluminum sample that was previously obtained. For gas to escape the lab, there was a fume

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Introduction: The purpose of this experiment is to demonstrate the different types of chemical reactions, those including Copper. There are different types of chemical reactions. A double displacement reaction is a chemical process involving the exchange of bonds between two reacting chemical species. A a decomposition reaction is the separation of a chemical compound into elements or simpler compounds and the single-displacement reaction is a type of

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The items that were massed were the evaporating dish, watch glass, and NaCO3. The materials were massed once before and once after being heated in the drying oven. The mass of the evaporating Dish before was 46.57 g; while after being heating was 60.15 g. The mass of the watch glass before was 57.97 g and after was 48.75g. There were two masses taken for the substance NaHCO3- one with the evaporating dish and one without, subtracted out after the lab was concluded. The mass of the substance with the dish was 48.79 g before and 62.33 g after; meanwhile, the mass of the substance without the dish was 2.22 g before and 2.18 g after. The mass of the NaHCO3 had changed after the reaction occurred along with after it was placed on the hot plate and being in the drying oven.

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A liquid has indefinite shape, definite volume, and no compressibility. In addition, gas has indefinite shape, indefinite volume, and compressibility. Furthermore, in order to identify elements, one will have to look at the atomic number, therefore, establishing the number of protons. Last but not least, a chemical change is a change in a substance

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A physical reactions goes into a physical change of substance. It does not change the composition normally. Physical reaction in a substance does not change what the substance should be. chemical change forms a chemical reaction, new substances are formed, and the energy is either giving off or absorb. Elements is a substance made of the same atomics.

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One thermometer was then placed into the 20mL of water in each graduated cylinder and left to sit at room temperature. When both thermometers reached the same temperature (the assumed ‘room temperature’), the water from one graduated cylinder was transferred into a 100mL beaker. The water from the other graduated cylinder was poured into a polystyrene cup. Using a scale and a weighboat, precisely 2 grams of ammonium chloride (NH4Cl) was measured and placed into the polystyrene cup with the 20mL of water. The chemical compound and the water were mixed together using a glass rod until the chemical was thoroughly dissolved.

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