Journal Entry:

Which intermolecular force can be found between all substances? Why? 

Learning Intentions

• We will learn the various types of intermolecular forces between substances and how they affect properties of the substances.

• We will learn how to predict strength of intermolecular forces based on evaporation rates and be able to relate to the structure of the molecules in the substance.

• We will learn how to explain the trends in properties of samples consisting of particles with no permanent dipole (non-polar) on the basis of London dispersion forces.

Closing Task:

You can explain the results of an evaporation exploration in terms of intermolecular forces within the substances.

Content Standards being covered:

Students can predict the type of bonding present between two atoms in a binary compound based on position in the periodic table and the electronegativity of the elements. (LO 2.17)

Students are able to use aspects of particulate models (i.e. particle spacing, motion, and forces of attraction) to reason about observed differences between solid and liquid phases and among solid and liquid materials. (LO 2.3)

London dispersion forces are attractive forces present between all atoms and molecular. London dispersion forces are often the strongest net intermolecular force between large molecules. (EK 2.B.1)

Dipole forces result from the attraction among the positive ends and negative ends or polar molecules. Hydrogen bonding is a strong type of dipole-dipole force that exists when very electronegative atoms (N, O and F) are involved. (EK 2.B.2)

Intermolecular forces play a key roles in determining the properties of substances, including biological molecules structures and interactions. ( EK 2.B.3)