Question

4. Define the melting point. What was the observed melting point of water? E T T O Word(s) 5. Define boiling point. What was the observed boiling point of water? B 1 ili O Words) 6. What happens to heat energy when it is not increasing the temperature of the substance in the beaker? Use your heating curve to explain your answer. B 1 U T T O Words

Answer 1

Melting Points forms af The temperature at which solid and liquid a pure substance can exist as in equilibrium on applying heat to solid its tempratore will increase till it reached melting point. This heat after melting point will convert solid into liquid without any temprature change. When all solid will be melted then adélition heat will raise temprature of liquid melting point observed for later is 0°c jie at oc water will exist at equilibrium between solid and liquid. Boiling point) The temprature required at which freess we exerted by surrounding on a liquid is in equilibrium with pressure exerted by vapour of liquid, hence in this condition heat will result in transformation of liquid into adeling vapour without any templeature raise. any templeature when any liquid partly vaporises into space above it outil it reaches a pressure exerted by vapour to some Characteristic value called vapour pressure of siquid at that temprature. moter exists between liquid and so at The tou boiling point of water is 100°c. je. at 100°c ropour phase.

IS measure of movement will be the temprature similarly to or 93- Temprature of substance. Je more the movement of molecule more Heat is total energy of subtance. but temperatu - invalres only movement of molecule je only kinetic energy. So when we provide heat energy any substance lets say subitance in al beaker it increase the tempreature till is reaches to its boiling point melting point i.e. all its equilibrium position of existance of two phase at same time. Then the heat is completely used for phase transformation and the templative stops from increase.je. temprature becomes constant. At this time added heat is stored -as potential energy. This heat at constant temprature is used for breaking the forces of attraction of forces of repulsion between molecule. Temp Phaise constant change. heat temprature on increase. Heat or absorbed energy.