Tanya says fast changes are chemical and slow ones are physical — so iron rusting (slow) i
Tanya says fast changes are chemical and slow ones are physical — so iron rusting (slow) is physical, and wood burning (fast) is chemical. Her friend says speed does not decide this. Who is right?
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Start thinking on Socho →More disagreements in Changes Around Us: Physical and Chemical
A candle's solid wax melts into liquid and then cools back into solidAdding a few drops of food colouring to a glass of water turns the water pinkAn iron rod is cut with a saw, and an identical rod is left out in the rain until it rustsSalt dissolves in water and disappears completelyMilk turns into curd, and curd does not turn back into milk