Differentiate between physical and chemical change.

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In physical change only the state of matter changes, no new substance is formed. Eg. On heating water is changed in to vapour and on cooling it is changed in to ice. While in chemical change a totally new substance is formed. Eg. Rusting of iron.
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In physical change, no chemical bonds are broken or formed (like boiling of water, water remains H2O in both liquid and vapour form) whereas in chemical change the bonds are either broken or formed that leads to a different substance formed.
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Related Questions

Find the molecular mass of H2O.
ATOMIC MASS OF H=1 ATOMIC MASS OF O=16 SO, MOLECULAR MASS OF H2O: (2x1+16)=2+16=18g
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Energy in any form is scalar. So potential energy to is scalar.
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Red colour light has highest wavelength.
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Why when a ball dropped from a height, its speed continuously increased?
the potential energy gets converted into kinetic energy so obviously yes. as velocity is the only variable , as the height decreases, there should be a corresponding increase in the velocity. (potential energy = mgh, kinetic energy = 1/2 mvxv
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