Agenda: Do Now (7 mins) Discuss Quizzes (10 mins) Discuss Lab Reports (20 mins) Finish notes (15 mins) Exit Question (5 mins)

Under what circumstance might a gas decrease in volume when Heated? a)The gas is held constant at STP. b)The gas remains under uniform temperature c)The gas is placed under increasing pressure d)The gas undergoes a decrease in pressure

6b: Students know how to describe the dissolving process at the molecular level by using the concept of random molecular motion. 1 minute

Remember last semester… Electronegativity = The attraction of an atom to its electrons. 2 minutes

When atoms have different electronegativities (such as Oxygen And Hydrogen in water)…then they are polar. When atoms are very close in electronegativity (like Carbon and Hydrogen) then they are non-polar. Polar MoleculeNon-Polar Molecule 5 minutes

Non-polar solvents dissolve non-polar solutes. Polar solvents dissolve polar solutes This is why oil and water don’t mix (water is polar…oil is non-polar) 5 minutes

The positive end of a molecule in the solvent pulls at the negative end of the solute. The negative end of a molecule in the solvent pulls at the positive end of the solute. This pulling, breaks the bonds of the solute and random motion Spreads it through the liquid 5 minutes

1 minute

Positives and Negatives are attracted 1 minute

The solvent pulls apart the solute 1 minute

Exit Question If the attractive forces among solid particles are less than the attractive forces between the solid and a liquid the solid will: a)Probably form a new precipitate as its crystal lattice is broken and re-formed b) Be unaffected because attractive forces within the crystal lattice are too strong for the dissolution to occur. c) Begin the process of melting to form a liquid d) Dissolve as particles are pulled away from the crystal lattice by the liquid molecules