Question

Mention four substance from your surroundings which

a) Shows the change of state in normal temperature.

b) Shows the change of state in high temperature.

Answer 1

a)
1-Ice when placed outside will melt to water.
2-Glycerine or alcohol will give a cooling effect to hand when poured. This is due to rapid vaporization.
3-When a glass of cold water is brought outside to room temperature drops of water forms outside. This is due to condensation of water vapor.
4-On a cold day, there will be formation of frost on windows. This is due to change of gas outside into solid

b)
1- When water is heated, it evaporates.
2- When a piece of camphor is heated , it undergo sublimation where it directly changes into gas.
3-When we keep wet clothes outside in the sun, it will dry off. This is due to evaporation.
4- When metals are heated to very high temperatures, they will melt into liquid