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Classify the changes involved in the following processes as physical or chemical changes: a. photosynthesis -b. dissolving sugar in water -c. burning of coal -d. melting of waxe. beating aluminium to make aluminium foil -f. digestion of food -​

Answer»

tion:physical changes only lead to a change in the physical properties of the substance and are reversible. Chemical changes lead to a change in the composition or STRUCTURE and are IRREVERSIBLE.in nature.(a) photosynthesis: irreversible, chemical changes. 6CO2 + CH2O = C6H12O6 + 6O2(b) Dissolving sugar in water: irreversible, chemical change.(c) Burning of coal. : irreversible, chemical change.(d) Melting of wax: reversible by cooling, physical change.(e) physical change as MALLEABILITY ( beating metal into THIN sheets ) does not change the composition.(f) DIGESTION: chemical change, irreversible.



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