Monthly Archives: December 2016

Lab 20D – Salt Hydrolysis

  1.  Any Q’s?  Check your answers to the worksheets either from this website (Acid #1 WS) or from the internet (i.e. AP Scoring Guidelines)
  2. Prelab 20D and more!  Make a GIANT table with the columns:  acid, base, salt, relative pH, hydrolysis equation.  Copy the salts from Lab 20D in the lab manual into the “salt” column.  What acid and base did the salt form from?  Predict whether the salt will be acidic or basic.  Write out a hydrolysis equation that supports your prediction.  See copy of lab here:  Lab 20D
  3. Stories around the “Campfire”
  4. Over Christmas break:  Download as many AP Exams as you can so you have them handy.  Download any useful AP Resources:

a)  Under “Updates”, there is a tab labeled “AP Chem Resources” where you will find a list of websites, practice exams, etc…

 

 

Bonus Lab!

  1.  Hand in Lab 16D and attach your prelab with it.
  2. Bonus mark lab:  Identify the cation and anion in the mystery samples by observing whether a precipitate forms or not with a variety of solutions.
  3. Do:  Keq test corrections.  If you need help or don’t know how to do your corrections, come after school to get some tutoring.

Empirical and Molecular Formulas – Day 2

  1.  I will be able to find the empirical and molecular formula of a compound.  See block 7 notes here:  Empirical and Molecular Formulas Day 2
  2. Read sections V.4 and V.5 and do Q# 44-45, 46, 47-55
  3. For fun:  A Chemistry Christmas Carol – identify all the elements mentioned in the story.  See a copy of it here:  http://employees.oneonta.edu/helsertl/ChemXmasCarol.html
  4. Video:  Magic and Cool Christmas Experiments you can do at home:

More Ka and Kb Calculations!

  1.  Video:

2.  Do:  Worksheet – Acid #1 and Ka WS (see copy here:  http://www.colgurchemistry.com/Chem12/pdfs/Ch12Worksheet4-4.pdf )

and answer key to Ka WS here:  http://start.sd34.bc.ca/andrewpenner/wp-content/uploads/2015/09/Worksheet4-4-Ka-Kb-Calculations-key.pdf

3.  Extra practice:  sample AP questions from 2009 (#1) and 2014 (#2).  You can look up the scoring guidelines online yourself.

4.  I will be able to determine whether the hydrolysis of a salt will form acidic, basic, or neutral solutions.  See block 4 notes here:  Salt Hydrolysis

Lab 16D

  1.  Prelab check:  you will get a Santa stamp to show you completed your prelab.
  2. Do:  For each DIFFERENT precipitate you formed, write a formula equation, complete ionic equation, and net ionic equation. (do this on a separate sheet of paper and then staple to your prelab)
  3. Next class:  lab 16E – bonus mark lab!

Acids and Bases Mid-Unit Qu-est

  1.  Students wrote a mid-chapter Qu-est on sections 16.1-16.5, and 16.11.
  2. More review of Ka and Kb calculations –> you can do more questions from the textbook OR try the sample AP questions from 2009 (Q#1) and 2014 (Q#2).  You may not be able to answer all the parts to the question as we have not finished the unit on acids and bases yet!
  3. Do:  Acid #1 Worksheet
  4. Try this simulation on pH:

https://phet.colorado.edu/en/simulation/ph-scale

 

Solubility and Precipitation Reactions

  1.  I will be able to calculate the molar solubility of a substance.
  2. I will be able to calculate the concentration of ions that dissociate from a soluble substance.
  3. I will be able to predict the solubility of a substance and predict whether a precipitate will form or not.  See block 6 class notes here:  Unit III Study Guide Block 6
  4. Read sections III.2 and III.3 and do questions from those sections
  5. Do:  Prelab 16D for next class.   See copy here:  Prelab 16D

Ka and Kb

  1.  Go over answers to the pH worksheet from last class:  ph-intro-basic-math-answer-key
  2. Test on sections 16.1-16.5, 16.11 on Monday.  Main topics covered are properties of acids and bases, Arrhenius, Bronsted-Lowry, and Lewis acids and bases, conjugate acid-base pairs, strengths of acids and bases, ionization of water, Kw, [H3O+], [OH-], pH, pOH calculations.  Format:  mc
  3. I will be able to use the Ka and/or Kb constant to find the [H3O+], [OH-], pH, pOH.  I will be able to compare the Keq constants to determine which acid or base is stronger.
  4. See class notes here:  ka-and-kb-examples-block-2
  5. Read sections 16.6-16.8 and do #49-68, #69-76, #77-86