For example, when you dissolve sugar in water, a physical change occurs. In some cases, it may be hard to tell whether a chemical or physical change occurred. Which of the following are physical changes? Select a statement that best completes the following sentence: During a _____ process, the identity of the molecule _____. A) the formation of a precipitate a color change B) the change in shape of a malleable metal ... bending metal C) cutting a cake D) frying an egg. Physical change is a temporary change. Rusting. Is breaking a piece of metal by bending it back and forth a chemical change? a.rusting b.melting c.bending d. boiling. A. polishing B. Bending C. rusting D. melting. A molecular vibration is a periodic motion of the atoms of a molecule relative to each other, such that the center of mass of the molecule remains unchanged. Often the filler metal is designed to produce a weld metal that’s similar in chemical composition to the base metal… A. chemical; does not change ... B. neither a chemical change nor a physical change C. physical changes only D. chemical changes only. Thus, chemical changes involve the formation of new substances. Any change in these physical properties is referred to as a physical change. which of the following changes to a metal is a chemical change? A) chopping wood B) bending metal C) cutting a cake. As its name implies, the objective of V-bending is to create a bend on sheet metal with a V shape. rusting. A chemical change occurs when the substance's composition is changed. The form of the sugar changes, but it remains the same chemically (sucrose molecules). B. bending metal C. cutting a cake. Rusting of iron is a redox reaction and its a chemical change, apart from this all others are physical changes. The most common sheet metal bending process is also the most diverse. The bending of the car is a physical change, but if the wreck catches fire that's a chemical change. boiling. For further information, please refer to Properties of Matter. Physical Change: Chemical Change: When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged. (i) Melting of iron metal (ii) Rusting of iron (iii) Bending of an iron rod (iv) Drawing a wire of iron metal (a) (i), (ii) and (iii) (b) (i), (ii) and (iv) (c) (i), (iii) and (iv) (d) (ii), (iii) and (iv) NCERT Class IX Sciences - Exemplar Problems Chapter 2. When a substance undergoes a chemical change, its molecular composition is changed entirely. a. rusting b.melting c.bending d.polishing. To avoid this problem, such holes must be located a prescribed distance away from bending axes. V-bending. Which of the following is NOT a likely indicator of a chemical change? But the fact is, most of the time a filler metal is used, and its chemical composition is critical because it can significantly influence the weld metal and the structural properties of the joint. 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