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QUESTION 4 Classify each of the following as a physical or chemical change - Iron rusting A.Physical change B.Chemical change Wood burning - 4 Photosynthesis A gas expanding as it is heated

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on Usti → Rusting of ion is a natural process ng takes place in the presenre of Oxgen and water 9t forms stable oxides Chemical veac tion of Yusting is as follous : fe + 02 Hhfe0 and fe,0, So, it is a tyie of chemical cha nge 2) wood buining Wood mainly Consist of Carbon twe know that when carbon is buint, it buoduces Co or CO2 So. When tuood boins , it produces Coo ,ash, eneg That is why Wood buining is a ty be of et Chemical change 3 Photo synthesis Photo sgnthesis is the process in twhich blant use co and H2O fiom envivonment to sunthesise glucose and Oxygen sunlight lucose xagen So, it is a type of chemicol process

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