In this case, when soap is applied to oil and grease, lipophilic parts of soap will attach itself to non polar molecules of oil. However, other component of soap, hydrophilic component, will be left on surface. When water is applied onto this surface with a sponge, hydrophilic component will be attracted to water molecules and is lifted from surface, together with oil. This way, both oil and soap is removed with wipe of sponge. At same time, because soap molecules have been combined with oil, other soap molecules will also be attracted to it. This is why you can see clusters of oil that are surrounded by soap within water that has been used for washing. Of course, once soap has been used up to attract oil, more soap would need to be added to work on access oil.

In conclusion, our lives have been made cleaner and easier through wonders of a simple substance called soap. Without it, we would be having a difficult time removing dirt, oil and grease in our everyday cleaning. Visit http://www.chemicool.com for knowledge on chemical elements,chemistry directory,chemistry tools and much more.

Other issue of concern is that through this procedure, some of eggs fertilized in lab are later discarded. Does this procedure mean that researchers are actually killing potential people? How is line drawn in this case?

Then there is also issue of commercial opportunities for eggs and sperms to be bought and surrogate wombs to be rented with purpose of creating babies. This process of embryo transfer to another mother, not necessarily same woman who had provided eggs, is known as placing embryo in a gestational carrier. This procedure has been becoming increasingly common through technological advancement, which has made couples including women with uterus problems, have a chance in having their baby.

Test-tube babies have really brought changes to way in which babies are conceived and have given much hope to many who have had problems having babies through process of . However, downside of this are ethical issues behind procedure, with which still poses a big question mark and with which is still opposed by many factions.For more details on cell, molecular and human biology please visit http://www.biology-online.org/tutorials/1_cell_biology.htm