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Title: Investigation about Chemical and Physical Changes

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Title: Investigation about Chemical and Physical Changes Date: 2/16/2005 Prepared for: Ms. E. McDonald Stanley Ho, Wilton SCN1D Problem Why I am conducting this experiment? In order to learn how to recognize chemical and physical changes, I have to carry out this experiment to see different chemical and physical changes of different substance. How can we recognize physical changes and chemical changes? A chemical change involves a creation of a new substance, but a physical change doesn't involve any creation of any substance. For example, if a piece of chalk drops on the floor and separates into a few small pieces, it's a physical change, because only the shape of the chalk changed, but no new substance is involved, but if a piece of sodium drops into water, gas comes out, and causes a "pop" sound, that is a chemical change because gas has been formed when sodium dropped in the water. Hypothesis Hypothesis for the experiment: After I conduct this experiment, I expect and suppose I can recognize and physical changes, identifying the difference these two kinds of changes. Also, I will be able to know some physical and chemical properties of copper (II) sulfate, water, iron, sodium carbonate, hydrochloric acid and magnesium and identify if it is a chemical change or physical change in each part of the experiment. ...read more.


can easily pass through Product description Color: Becomes white when the magnesium ribbon is put into the acid State: Liquid Temperature: Increase when the magnesium ribbon is put into the acid Addition information: The product fizzles when the magnesium ribbon and the acid are put together and a new gas has been formed Discussion After I've done the experiment, I clearly understand the concepts of physical change, successfully to identify if substances are performing chemical and physical change. In this experiment, I think part A and C are physical changes. In part A of the experiment, I define it as a physical change because the product has shown the signs of physical change, because I've seen the particles flowing in the product, which means the product is a suspension and an indicator of physical change and the color of product is blue only. The product is a mixture, which means no new substance is formed, so it's a physical change. In part C, after I mixed the two reactants, it has no signs of chemical change in the product, and I can't see any new substance has been formed, which is the best sign of a physical change. Also, diffusion occurs in the product, the sodium carbonate solution stays at the top and the copper (II) ...read more.


Chemical changes also occur in our life. Oxygen reacts with metals; metals are worn by oxygen, which is very important and harmful to me because my properties that are made of metals will be damaged. Controlled burning in my body is also another important, beneficial chemical change in my body; new substances are formed from substances in my body and oxygen to maintain my life. Conclusion In conclusion, I think part A and C are physical changes, and part B and D are chemical changes. Also, I learnt how to recognize physical and chemical changes in this experiment, some chemical and physical properties of the substances used in this experiment and signs of a chemical and physical change. Sources of error Here is the list of errors: * I couldn't define the exact shape of copper (II) sulfate, which I might be wrong in the reactant description of part A about the shape of copper (II) sulfate. Ways to Improve the Experiment Here is the way to improve to the experiment: * Use a magnifier to ensure the shape of the substances. Applications of that Knowledge After I learnt how to recognize chemical and physical change, I can check the milk in my refrigerator to see if the milk has chemical change, and I can drink it or not. - 1 - ...read more.

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