It finds application in varied fields of Science. Record the weights before beginning the experiment. Also, as the faster-moving molecules escape, the remaining molecules have lower average kinetic energy, and the temperature of the liquid thus decreases. After about two hours check the depth of each bowl again. Warning is hereby given that not all Project Ideas are appropriate for all individuals or in all circumstances. Conclusion: The intermolecular forces of acetone, benzene and chloroform are in order. Vapour pressure is the pressure used by vapours in equilibrium with its liquid at a delivered temperature in a closed system.
This effect is also related to boiling point elevation and freezing point depression. This is why evaporating sweat cools the human body. As you probably know, the molecules in a liquid are close enough to be a visible substance, but loose enough to have very little shape. Dear pdunkle, Thank you for using the Ask an Expert forums. Evaporation of Liquids Sometimes a liquid can be sitting in one place maybe a puddle and its molecules will become a gas. Requirements 3 petridishes of 2. Wash and Clean, dry the Petri dishes and mark them as A, B.
In addition, molecules in motion have more energy than those at rest, and so the stronger the flow of air, the greater the evaporating power of the air molecules. Temperature 0 C Volume Taken ml. The quantity left after the time period has elapsed determines the rate at which the liquids evaporate. You might be wondering how that can happen when the temperature is low. Evaporation Evaporation is the process by which liquid spontaneously turns into gas. The other liquids could really be anything.
Since only a small proportion of the molecules are located near the surface and are moving in the proper direction to escape at any given. I think they could form without evaporation as a result of tectonic activity around an underground river. The higher the temperature is the quicker the rate of evaporation. Note the remaining volume after 10 min. Now cover each of the petri dish and note the volume of remaining material in them. After a few days in the warm sun, the liquid in your bowls will have evaporated.
The salt molecules also push down the water molecules so the water molecules have to get enough power to evaporate. Sometimes the transfer is so one-sided for a molecule near the surface that it ends up with enough energy to 'escape'. . I believe it was incorrect because rubbing alcohol is lighter than water. There is a small fraction of molecules which have enough kinetic energy to overcome the attractive forces and escape into gas phase.
Abstract In this project, we shall investigate various factors such as nature of liquid, surface of liquid and temperature and find their correlation with the rate of evaporation of different liquids. My hypothesis that water would evaporate the third fastest was incorrect. Uncover all the petridishes simultaneously and start the stopwatch. Cut two 2-inch squares from the towel. Rate of evaporation of Chloroform is 0. Pour the same amount of each liquid into separate bowls about one cup. You should observe the rubbing alcohol evaporated the most and the orange juice the least.
If fresh air is moving over the substance all the time, then the concentration of the substance in the air is less likely to go up with time, thus encouraging faster evaporation. Taking notes wherever relevant helps a lot. Pipette out lOmL of water, acetone and diethyl ether onto the three weight bottles A, B and C. Evaporation occurs more instantly at a higher temperature and in liquids with lower surface tension. Concentration of other substances in the air. I would also like to thank my lab incharge Mr.
Purpose To examine what happens to various liquids when they've been left in the sun for extended periods of time. You'll notice that the liquids will be evaporating with each measurement. Thanks for looking over my questions. Clean and dry all Petri dishes and identify them as A, B and C. There are always a few molecules with a lot of energy and some with barely any energy at all. When you have a puddle of water H2O on a windy day, the wind can cause an increased rate of evaporation even when it is cold out.