Adding a few drops of food colouring to a glass of water turns the water pink
Adding a few drops of food colouring to a glass of water turns the water pink. Kabir says this is a chemical change, because the colour changed. His sister says it is a physical change. 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 solidAn 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 milkTanya says fast changes are chemical and slow ones are physical — so iron rusting (slow) i