E chapter 9 changes matter part2

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    17-Jan-2017

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<p>Changes matter</p> <p>Changes matter</p> <p>Melting :It is the process of changing solid to liquid by heating.</p> <p>EvaporationIt is the process of changing liquid to vapour by heating</p> <p>CondensationIt is the process of changing vapour to liquid by cooling .</p> <p>Freezing It is the process of changing liquid to solid by cooling.</p> <p>SublimationIt is the process of changing solid to gas by heating.</p> <p>What do u think which process will be reversible and which will be irreversible?</p> <p>Reversible:Melting.Evaporation.Condensation.Freezing.</p> <p>IrreversibleSublimation</p> <p>What do u think this change in state called?Physical change :Why?</p> <p>-Change in the form of an object without changing what type of matter it is.-Change in the shape.</p> <p>Melting pointTemperature at which substance melts. oExample : Pure water melts at 0 C.</p> <p>Boiling pointTemperature at which substance boils. oExample: Pure water melts at 100 C.</p> <p>Freezing pointTemperature at which substance freezes. oExample : Pure water freezes at 0 C.</p>