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