Drill: Draw LDDs for: BF 3 NH 3 C 3 H 6 C 3 H 7 NO

Review & Collect Drill & HW

CHM II Test Thursday or Friday

CHM II HW Read: PP-18 Complete the attached assignment & turn it in tomorrow.

Are there any questions on previous material?

Solutions

Solution Homogeneous mixture made up of at least one solute dissolved in the solvent

Solute Substance being dissolved Portion in lesser molar amount

Solvent Substance doing the dissolving Portion in greatest molar amount

Colloid Slightly larger particles Light passes & particles stay suspended

Suspension Even larger particles Particles block or reflect light

Tyndall Effect Because light reflects off suspended particles, the light ray can be seen from the side

Size Comparison Solution < Colloid Colloid < Suspension

Soluble When one substance (solute) dissolves in another (solvent)

Solubility The max amount of one substance (solute) dissolved in another (solvent)

Concentration The amount of solute dissolved into solution

Concentrated Solution A solution with a relatively large amount of solute dissolved

Dilute Solution A solution with a relatively small amount of solute dissolved

Saturated Solution A solution with the maximum amount of solute dissolved in the solution

Unsaturated Solution A solution with less than the maximum amount of solute dissolved in solution

Supersaturated Solution A solution with greater than the maximum amount of solute dissolved in solution

Drill: Draw LDDs for: C 4 H 8 HNO 3 C 4 H 6

CHM II HW Review PP-18 Complete the worksheet attached to the Poly Website, & turn it in tomorrow.

Review & Collect Drill & HW

Solution Chemistry

Solution Measures Concentration: % soln –Molarity –Molality –Mole Fraction

Percent Solution Mass of one portion per the total mass, all times 100 % % soln = m a /m total x 100 %

Molarity Moles of solute per liter of solution M = moles solute /L soln

Molality Moles of solute per kilogram of solvent mo = moles solute /kg solvent

Mole Fraction Moles of one portion per total number of moles in the solution X = moles a /moles soln

Calculate the molarity of a 250 mL solution containing 5.0 g NaOH dissolved in water

Calculate the molality of 69 g of C 2 H 5 OH dissolved in mL of water

Calculate the mole fraction of each portion when 92 g of C 2 H 5 OH dissolved in 144 mL of water

Calculate the molality & mole fraction of a solution containing 46 g of C 2 H 5 OH dissolved in 1782 mL of water

Drill: Calculate the mass of KI required to make 250 mL of M KI.

Review & Collect Drill & HW

We will have a test on LDDs & Solution Chemistry by the end of this week.

CHM II HW Review PP-18 Complete the attached problem (CP-1) & turn it in tomorrow.

Are there any questions on previous material?

Colligative Properties Properties dependent only on the concentration of particles in solution

Examples Vapor pressure Boiling & Freezing points Osmotic pressure

Vapor Pressure VP solution = (VP solvent )(X solvent ) X = mole fraction VP = vapor pressure

Boiling & Freezing  T = i moK  T = change in BP or FP i = ionic activity K = BP or FP constant

Osmotic Pressure  = i MRT  = osmotic pressure i = ionic activity M = Molarity

Calculate the vapor pressure of a solution containing 150 g C 5 H 10 O 5 in 162 mL of water at 30 o C

Calculate BP & FP of 60.0 g of NaOH in 250 mL water K BP = o C/mo K FP = o C/mo

Calculate the osmotic pressure of a solution containing 12 g of NaOH dissolved in 250 mL solution at 27 o C

Drill: Calculate the VP of a solution containing 36 % m/m glucose (C 6 H 12 O 6 ) in water at 29 o C: (VP water = 30.0 mm Hg )

Review & Collect Drill & HW

CHM II HW Review PP-18 Test: Thursday

Are there any questions on previous material?

Test Review

Classify the type of Bonding: Fe-ClFe-Cr C-ClH-Br S-OK-I

Classify the type of IM Force: H 2 & Cl 2 HF & HF H 2 & HClHBr & HI CH 4 & C 2 H 6

Draw LDDs for: BH 3 NCl 3 CF 4 C 3 H 6 IF 3 CO 3 -2

Calculate the FP & BP of a solution containing 120 g C 3 H 7 OH in 250 mL of water at its BP. K BP = o C/mo K FP = o C/mo

Drill: Calculate the molarity of 33.1 g of Pb(NO 3 ) 2 dissolved in 250 mL of solution.

Review & Collect Drill & HW

CHM II HW Review for the test covering tomorrow. The test covers Bonding, LDDs, & Solution Chemistry (PP 15 & 18).

Draw LDDs for: PCl 3 C 3 H 7 NO NO 3 -1

Calculate the osmotic pressure of a solution containing 12 g of C 4 H 8 O 4 dissolved in 50.0 mL solution at 27 o C

Calculate the vapor pressure of a solution containing 12.0 g C 3 H 8 O in 14.4 mL of water at its BP. VP solvent = 120 kPa

Calculate the mass of lead(II)nitrate required to make 250 mL of 0.40 M Pb(NO 3 ) 2

Calculate the BP of a solution containing 29.9 g of CoBr 3 dissolved in 75 mL of water. K BP = o C/mo

Calculate the molality of a solution that is 33.1 % by mass Pb(NO 3 ) 2 in water

Drill: Calculate the osmotic pressure of 0.88 g of CO 2 in 750 mL of soln at 27 o C

30.0 g C 3 H 6 NF was dissolved in 50.0 g C 6 H 12 O (VP = 20.0 kPa) at 27 o C making a g/mL solution. Calculate: X, mo, M, , & VP.

180 g C 3 H 8 O was dissolved in 180 mL H 2 O at 27 o C making a 1.5 g/mL solution. Calculate X, mo, M, , VP, BP, & FP.

A 1.2 g/cm 3 aqueous solution is 20.0 % by mass NaOH at 27 o C. Calculate: X, mo, M, , & MP

Calculate the molecular mass of a covalent compound dissolved in an aqueous solution to make it 25 % by mass when it boils at o C