Molecular polarity lab

Molecular Polarity https://goo.gl/zQkLwf This lab does not use the Beyond Labz software Go to the website listed above. Click the play symbol on the simulation. Part 1: Two Atom Investigation (diatomic molecule) ❏ Click the keep the box for bond dipole checked and check the boxes to show the partial charges and the bond character ❏ Keep the electronegativity of A at low and increase and decrease the electronegativity of atom B. Observe the arrow, partial charge and bond character. Fill in the following observation As the electronegativity of atom B increases the... arrow Movies from point A to point B and get bigger toward B partial charges The partial charges on A (+) and partial charge on B (-) they increase and get bigger bond character It will get more iconic ❏ Now put the electronegativity for A to the middle and vary the electronegativity of B and observe the results. Fill in the following information. ● The polarity arrow always points to the ________________________________ electronegative atom. ● The partial positive charge is always on the _____________________________ electronegative atom. ● The larger the electronegativity difference the more __________________________________ the bond character. Part 2: Three atom Investigation ❏ Keep the original “bent” arrangement of atoms and set the electronegativities of A and C to low and B to middle. Click to show the bond dipoles, molecular dipoles and partial charges. ❏ Draw the bond dipoles on the bonds in the diagram ❏ Show the overall molecular dipole in the diagram ❏ Draw the partial charge symbols on the diagram. ❏ Click the reset button. Keep the “bent” arrangement of atoms and set the electronegativities of A and C to high and B to middle. Click to show the bond dipoles, molecular dipoles and partial charges. ❏ Draw the bond dipoles on the bonds in the diagram ❏ Show the overall molecular dipole in the diagram ❏ Draw the partial charge symbols on the diagram. ❏ Click the reset button. Change the arrangement of atoms to a “linear” arrangement (see below) and set the electronegativities of A and C to high and keep B to middle. Click to show the bond dipoles, molecular dipoles and partial charges. ❏ Draw the bond dipoles on the bonds in the diagram ❏ Show the overall molecular dipole in the diagram ❏ Draw the partial charge symbols on the diagram. . ❏ Rotate the molecule to keep the “linear” arrangement (see below) and set the electronegativities of A to high, keep B to middle and set C to low. Click to show the bond dipoles, molecular dipoles and partial charges. ❏ Draw the bond dipoles on the bonds in the diagram ❏ Show the overall molecular dipole in the diagram ❏ Draw the partial charge symbols on the diagram. ❏ Rotate the molecule to keep the “linear” arrangement (see below) and set the electronegativities of A and C to low and keep B to middle and set C to low. Click to show the bond dipoles, molecular dipoles and partial charges. ❏ Draw the bond dipoles on the bonds in the diagram ❏ Show the overall molecular dipole in the diagram ❏ Draw the partial charge symbols on the diagram. ❏ Rotate the molecule to keep the “linear” arrangement (see below) and set the electronegativities of A, Band C to middle. Click to show the bond dipoles, molecular dipoles and partial charges. ❏ Draw the bond dipoles on the bonds in the diagram ❏ Show the overall molecular dipole in the diagram ❏ Draw the partial charge symbols on the diagram. Vapor Pressure and Boiling Point Liquids have a vapor above them with which they are constantly exchanging particles. If the liquid is in a closed container eventually an equilibrium is reached (rate of particles escaping = rate of particles returning). The pressure of that vapor can be then measured and is called the vapor pressure of the liquid. The stronger the intermolecular forces between the particles in a liquid the harder it is for particles to escape the surface and the lower its vapor pressure. The larger the molecular dipole on a species the stronger the intermolecular forces. The vapor pressure of any liquid increases with temperature. A liquid boils when its vapor pressure equals atmospheric pressure. A liquid with high intermolecular forces has a lower vapor pressure (at a given temperature) then a species with low intermolecular forces. Therefore, species with high intermolecular forces boil at higher temperatures than species with low intermolecular forces. Summary Summarize what you learned by answering the following questions.