Tips for Intermolecular Force explanation

Ola!, today i would like to share some tips for you. here it is.

Many students having problems to give a good answers especially when it comes to explanation. They tend to ignore the question during daily practicing or maybe left it blank in exam!!!.

In Intermolecular forces topic, there is some questions for student to give an explanation. To help them to answer the questions, i ask them to fill in the important keywords in the table before their write them in simple paragraph.  By completing the table they can easily notify the differences between the molecules thus help them to choose the correct answer.

Happy Practicing Guys!.

Strength Of Van Der Waals forces

There are two types of intermolecular forces, one of them is Van Der Waals (VDW) forces.  Form the pictures below Van Der Waals are divided into 2 other types of intermolecular forces which call Dipole-dipole forces and London Dispersion Forces



The strength of VDW forces depends on molecular size, shape and polarity. As you can see above (on right side), I draw a chart for my student on how to identify which molecules having a higher boling point than the others. From the chart, the most important factors that affects boling point in VDW is the molecular size (calculate the Mr), the bigger the size (Mr) the greater the boling point. This chart has help my students to identify and arrange the molecules according to their boiling point more clearly. Hope that this will help you too !