Intermolecular Force Lab Report

In this lab, the guiding question is “How does the surface tension and relative intermolecular forces compare between certain substances?” In order to fully understand this guiding question, we have to know what is the surface tension and intermolecular force. The definition of surface tension is “the inward force, or pull, that tends to minimize the surface area of a liquid, and the definition of intermolecular force is the force, or pull, between the molecular which has polar side(Chemistry,2017).” Also, the phenomena which is same kind of molecules pull each other is called cohesion force. Similarly, the force, or pull, which made between molecules is called intermolecular force. Furthermore, the intermolecular force became more stronger …show more content…
In order to get those information, we will use penny, dropper, rular, and 6 different type of liquids: ethanol, methanol, 2-prophanes, cyclohexane, acetone, H2O. The important things, conditioning factor, are that maintaining the position of dropper and penny, and same penny, and the speed of dropping. This is because if those thing changed during experiments, it can cause error. First, we will put penny on flat location. After that, we will drop each liquid by using dropper in same speed. Also, we measure the height of dropper by rular because we have to maintain height of dropper as 1 cm. After that we will drop those liquid on penny until surface tensions of molecule are broken. We consider that when the liquids start not being able to pack on penny, the starting points are the moments when surface tension of liquids broken. Also, we will make double the number of drops of water because when we measure the size one drop of each molecule, the size of water is double than other 5 liquids. We will practice those step to each 6 liquids. After that, we will make data table about number of drops which are on the penny, and we will compare the surface tension of those