Question

Classify as Physical and chemical changes with reason :

a) Making fruit salad with raw fruits

b) Dissolving sugar in water

c) Melting of chocolate

d) Boiling of potatoes

e) Burning of wood

f) Rusting of almirah

g) Passing electric current through water and the water breaking down into hydrogen and oxygen

h) Sun-tanning

i) Bread rising

j) Milk turning sour

k) Burning LPG

please say me with reasons
please answer me fast
.......
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Answer 1

Answer:

a) It's a physical change as it the fruits are just cut , thier physical form is changed and no any new substance is formed

b) this is also a physical change as the molecules of sugar are mixed with the molecules of water

one more reason for this is that it's a reversible change means sugar can be separated from water by just evaporation

c) it's a physical change as only the physical structure of chocolate is changed and no formation of a new substance

d)it's a chemical change because in this reaction heat is involved and the patatoes are no more raw

e) it's a chemical change as the wood after burning is changed to coal which shows that chemical structure of the wood is completely changed

f) Rusting is a chemical change as the iron reacts chemically with oxygen and water and new substance rust is formes

g)it's a physical change as the structure of ions is changed

h ) this is a chemical change which causes darkening and pigmentation

I) it's a chemical change because C02 gas is released in the reaction and the bread is chemically changed

j ) this is also a chemical reaction because souring of milk produces new molecules and this change is irreversible also

k) burning lpg is chemical change as its chemical structure is changed and it's an irreversible change also

hope it helps. ::))

Answer 2

Answer:

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