Catalyst

CatalystPlease complete on WEEK SHEET for Thursday,

March 29th, 2012.

Remember: Show your strategies!1. Underline the question

2. Circle key words3. [Bracket] anything you don’t understand

4. Eliminate answers5. Choose correct answer

3 minutes left!


March 29th, 2012.




2 minutes left!


March 29th, 2012.




1 minute left!


March 29th, 2012.




Catalyst Checkers!!!

Agenda

• Notebook Quiz• Finish Quiz• Grade Quiz• 2 demos• Whiteboard Review

Notebook Quiz

• Get ready… • 3 questions• Write answer on mini sheet• If you’re looking around, you earn a zero• When finished, we immediately pass it on

towards the middle – I’ll give you 10 seconds

Question #1On the solubility Rules WS

on page 96, we classified the first compound,

potassium bromide as what? Soluble or insoluble?

Question #2Looking at your table of

contents, what is the title of what we did on

page 94?

Question #3On the top of the sheet on

page 95, list two compounds that are in the graph. (formula is

fine)

Times up!You have 10

seconds to pass it to the middle!

Times up!I’ll grade the ones that were handed

in on time

Return Quizzes

• Quizzes and answer keys are online• Along with powerpoints (including today’s

WHICH IS A GREAT REVIEW)

• Quizzes and today’s powerpoint make for a great review

Increase / Decrease Solubility?

• If you use large particles or chunks of cinnamon ?


• If you use large particles or chunks of cinnamon ?•Decrease – small particles

increase solubility b/c of more surface area


•If you stir the mixture with a stirring rod?


•If you stir the mixture with a stirring rod?

• Increase because more solvent particles are coming in contact with solute particles causing more SOLVATION

Increase / Decrease Solubility (rate of dissolving)?

• If you increase the temperature of a mixture?


• If you increase the temperature of a mixture?• Increase the rate of dissolving due to more

collisions between solvent molecules surrounding solute particles (SOLVATION)


If manufacturers of Coke dissolved CO2 gas in a very hot, 90 degree room?


If manufacturers of Coke dissolved CO2 gas in a very hot, 90 degree room?

Decrease solubility because higher temperatures make gases ‘jump out’ of solutions

Temperature is inversely related with gas solubility (if temp increases, solubility decreases but if temp decreases, solubility increases)


If manufacturers of Coke dissolved CO2 gas in a very high pressurized can?


If manufacturers of Coke dissolved CO2 gas in a very high pressurized can?

Increase rate of dissolving because high pressure keeps the gas from ‘jumping out’.

Pressure and solubility of gas are directly related (if pressure increases, then solubility of gas increases and if pressure decreases, solubility of gas decreases)

You have a kool-aid solution that is very dilute and you could add more sugar, the kool-aid is an example of a(n) _?_ solution.

You have a kool-aid solution that is very dilute and you could add more sugar, the kool-aid is an example of a(n) _?_ solution.

Unsaturated (not enough, put more in)

POLAR / NON-POLAR?

• Water is polar and oil is non-polar. The food coloring dissolves in water, therefore food coloring is ?

POLAR / NON-POLAR?

• Water is polar and oil is non-polar. The food coloring dissolves in water, therefore food coloring is

• POLAR because we know ‘LIKE DISSOLVES LIKE’

• Polar dissolves polar• Non-polar dissolves non-polar

Soluble / Insoluble?

Lead (II) chloride

Soluble / Insoluble?

Lead (II) chlorideInsolubleCl- is soluble EXCEPT with Ag, Pb, and Hg

LEAD is Pb therefore Insoluble

Precipitate or no precipitate?

Iron (III) sulfate


Iron (III) sulfateno precipitate b/c SO4

2- is soluble except with Sr, Ba, Pb, and Hg

Iron is Fe so none of the exceptions


Pb(NO3)2 reacts with NaBr

Remember they switch partners


Pb(NO3)2 reacts with NaBr

Remember they switch partnersPbBr2 + NaNO3

PbBr2 is insoluble so PRECIPITATE

3 things you can tell me about this picture

1. NaCl is being dissolved by water (aq)2. Opposites attract (Cl- is attracted to H’s and Na+

is attracted to O-)3. This process is called SOLVATION

At 30 oC, how much KClO3 can be dissolved in 100 g H2O?

At 30 oC, how much KClO3 can be dissolved in 100 g H2O?

11 g or 12 g (just above 10 g line)

V1M1= V2M2

• You need a 0.70 M BaOH solution. What volume would you end up with if you diluted 0.20 L of 0.90 M NaOH solution to obtain the necessary 0.70 M BaOH solution?

V1M1= V2M2

• You need a 0.70 M BaOH solution. What volume would you end up with if you diluted 0.20 L of 0.90 M NaOH solution to obtain the necessary 0.70 M BaOH solution?

• = (0.20 L)(0.90 M) / 0.70 M• = 0.18/ 0.70 = 0.25714 = 0.26 L

V1

M1

M2

V2

Colligative Properties

• Mr. Kersten is attempting to freeze his ice at the coldest temperature possible. Which amount of salt would cause the greatest freezing point depression?

• 100 mol NaCl• 200 mol LiCl• 300 mol KBr• 400 mol NaBr

Colligative Properties• Mr. Kersten is attempting to freeze his ice at the

coldest temperature possible. Which amount of salt would cause the greatest freezing point depression?

• 100 mol NaCl• 200 mol LiCl• 300 mol KBr• 400 mol NaBr b/c it DEPENDS ON

CONCENTRATION = the more solute you have, the greater the depression of the freezing point (NaCl vs KBr vs NaBr does NOT matter)

Catalyst

Documents

Transcript of Catalyst