This powerpoint presentation for middle school students describes physical and chemical changes and uses photos of common physical and chemical changes to clarify the difference between the two. *Tell evidence of physical changes and chemical reactions. Chemical change b. Chemical Equation: The re[representation of a chemical reaction using symbols and formulae of the elements or compounds involved in the reaction is known as a chemical equation. Chemical changes: A Chemical change occurs when two or more chemical substances react to form new product that have an entirely different set of properties. Give another example of a familiar process in which both the chemical and physical changes take place. Tearing of paper sheet: Even after being torn in very small pieces; each piece is a piece of paper. Physical Change: Chemical Change: When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged. Thus, chemical changes involve the formation of new substances. Neither a physical or chemical change 4. For example; heating of water melting of butter, cutting of paper etc. When a substance undergoes a chemical change, its molecular composition is changed entirely. When a candle burns, both physical and chemical changes take place. https://www.slideshare.net/dodo986/ppt-chemical-or-physical-reaction Examples: Folding of a paper sheet: A paper can be folded or unfolded, and hence it is an example of physical change. Physical change is a temporary change. A physical change is a reversible change. Q.5. Powerpoint is 25 slides long and is aligned with Texas TEKS 7.7(A). If anyone of these is prevented to come in contact with iron, rusting can be prevented. Moreover, no new substance is formed in this process, so it is a physical change. Physical change c. Freezing d. boiling 5. Since no new substance is formed in this process, so it is a physical change. subject notes on class 7 science chemical change. When a new substance is formed with different properties than the original substance it is called a a. *Understand the difference between physical changes and chemical reactions. *Categorize changes as physical or chemical, and show examples of each. Rusting: The process of formation of a reddish-brown substance on the surface of the iron objects in the presence of flaky moisture and air is called rusting. Filed Under: Class 7, Physical and Chemical Changes, Science Tagged With: Boiling of Water and Condensation of Steam, characteristics of a physical change, examples of physical change, Melting of Ice and Freezing of Water, physical change, types of changes. 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