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 whenHeated?

a)The gas is held constant at STP.b)The gas remains under uniform temperaturec)The gas is placed under increasing pressured)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 OxygenAnd Hydrogen in water)…then they are polar.

When atoms are very close in electronegativity (like Carbon and Hydrogen) then they are non-polar.

Polar Molecule Non-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 negativeend 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 motionSpreads it through the liquid

5 minutes

1 minute

Positives and Negatives are attracted

1 minute

The solvent pulls apart the solute1 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 brokenand 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 liquidd) Dissolve as particles are pulled away from the crystal lattice

by the liquid molecules