Monthly Archives: April 2018

Oxides and Buffers

  1.  Reminder:  Goal Day on Thursday, May 3.  If you want to retest the Acids and Bases test, you should have completed the test corrections and can show me what you have done to help you prepare for the retest (i.e. practice questions, etc…)
  2. Demo:  Metal oxides and non metal oxides
  3. I will be able to predict whether oxides are acidic or basic.  See notes here:  Oxides
  4. I will be able to explain how to make a buffer, what it does, and how it works.  See notes here:  Buffers
  5. Read sections 19-21 in your workbook.
  6. Note:  Unit IV test (Part 3) on Tuesday, May 8

Review Session #1

  1.  We went over AP topics in class.  Block 5 went over Ch13 and organic chemistry.  Block 6 went over titrations and buffers.  If you have any topics you would like to go over in class, let me know!  We’ll see how time permits.  You can also come after school to review/ask questions/ etc….
  2. Go over ch20 test and do corrections.  What did you know well?  What were silly mistakes?  What were concepts you were confused about?
  3. Reminder:  Return F/T forms for the Chem13 News contest!
  4. Reminder:  Goal Day on Thursday

Review!

  1.  Fizz Quiz – For XeF4, what is the Lewis dot, shape, bond angles, polarity, and hybridization of the molecule?
  2. Finish the chapter notes for ch7-9.
  3. Finish the chapter review worksheets for ch7-9.  The answer keys were posted in last day’s blog.  Mark your answers, do corrections.  Note where you have strong understanding of concepts and where you need to review more.  Note questions you want to ask.
  4. Ch7-9 Test on Monday, May 7

Diffusion and Osmosis

  1.  Hand in the Onion Cell Lab
  2. Reminder:  Goal Day on Thurs. May 3.  If you have not completed/handed in assignments, tests, projects, etc…please make sure you complete them this weekend, come in after school next week, and come in on Goal Day.  I have set aside 8:30-10am for Science 8 students.  If you cannot make it during this time, come talk to me.  You can come any other time during the day, but my focus will be on the other grades/subjects.  I will help you when I have the chance.
  3. I will be able to explain how diffusion and osmosis works.  I will be able to explain in which direction water will move through a selectively permeable membrane.
  4. Video:

5.  Do:  Gummy Bear Lab Day 1

6. Do:  Read section 1.3 and you can color the Osmosis coloring sheet to help you understand how osmosis works.

7.  Do:  the Amoeba sisters worksheet for homework.

Lab 20G Day 2

  1.  Using your results and calculations from Parts 1 and 2, do Parts 3 and 4 today.
  2. Part 3 – Find the molar mass of a weak monoprotic acid.  Make sure you indicate which letter unknown your group chose. (Hint:  you already know the mass of the acid since you weighed it.  To find the molar mass, you need to know the number of moles of acid that reacted.  The units of molar mass are grams per mole)
  3. Part 4 – Find the Ka of a weak monoprotic acid.  Make sure you indicate which letter unknown your group chose.  (Hint:  the titration will help you determine the initial concentration of the acid.  The pH you measured will help you determine the equilibrium concentration of the hydronium ion.  Using a RICE table, find the equilibrium concentrations of all the species.  Use your Ka expression to find the equilibrium constant)

Lab 20G Day 1

  1.  Today, students completed Lab 20G Parts 1 and 2.
  2. For Part 1, calculate the molarity of oxalic acid dihyrate you made.  (this is your standard solution)
  3. For Part 2, calculate the molarity of NaOH. (this is your standardized solution)
  4. For next class, make sure you have the prelab for Parts 3 and 4 finished.

Ch20 Review

  1.  Warm Up!  Low-tech kahoot of old provincial exam questions. (we looked at #39-50 of the 2010 Chem12 provincial)
  2. Go over ch20 review WS answers, do corrections.  See answer key here:  Ch20 review worksheet
  3. Study!
  4. Test outline:  about 20 mc Q’s and about 4 written Q’s (some with parts).  The written section will have a question on balancing redox reactions, galvanic cells, electrolytic cells, and one involving Faraday’s constant/Nernst/Gibbs Free Energy/Equilibrium constant.