1 / 48

NO SCHOOL Te acher training

4/8/13. NO SCHOOL Te acher training. 4/9/2013 Standards : 5 (Acids and Bases ) O bjectives : ●  Work CST problems with responders for CST Review (q's 59-64) ●  Students will be able to identify strong and weak acids. ●  Students will be able to K a for any acid given its formula.

giulia
Download Presentation

NO SCHOOL Te acher training

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 4/8/13 NO SCHOOL Teacher training

  2. 4/9/2013 Standards: 5 (Acids and Bases) Objectives: ●  Work CST problems with responders for CST Review (q's 59-64) ●  Students will be able to identify strong and weak acids. ●  Students will be able to Ka for any acid given its formula. DO NOW: 1. GET RESPONDERS AND SIGN-IN 2. Define: a. Strong Acid; b. Weak Acid; c. Strong Base; d. Weak Base HOMEWORK: 1. Ch 19.2 p. 605 10 (a,b,c); 11 (a,b,c,d) (5 pts) Std 5 2. CST Problems 59-64 (5 pts) Std MISC Follow these directions - Copy questions if no calculations and give reasons with page #'s or quote me if I gave explanation; for calculation problems - given, find, and show calcs. =========================================================== STAMPING:   ●  Journal 4/5 (Fri last wk) 1. Ch 19.1 p. 601 PP's - 3. (a,b,c) and Ch 19.1 Assess. - 4-9 (5 pts) Std 5 2. CST Problems 53-58 (5 pts) Std MISC STAPLE

  3. Monday April 22 - Mr. Wigger's CST

  4. Page 601 - Ch 19.1 Assess Answers

  5. DO NOW FIRST STRONG ACIDS HCl HNO3 H2SO4 HClO4

  6. STRONG BASES Metal with OH-

  7. page 601 answers

  8. Reviewing Keq

  9. 1 In the expression below, what is letter ________ ? B A a c d D C b aA + bB -----> cC + dD A reactant D concentration B product E exponent C coefficient F identifies substance G all of these

  10. 2 In the expression below, what is letter ________ ? B a A c D C b d [C]c[D]d Keq = [A]a[B]b A reactant D concentration B product E exponent C coefficient F identifies substance G all of these

  11. CST Questions 59-64

  12. Demonstration of strong & weak acids using conductivity light: Page 602

  13. What does a STRONG acid look like? What does a WEAK acid look like? Page 603

  14. Species - not like biology. They are any molecule or ion. Examples:

  15. without stamping, this presentation takes one whole period Bronsted-Lowry Acids & Bases Acid ====> Proton Donor Base ====> Proton Acceptor (H+ ion is a proton) These guys are on the left side of the equation

  16. Bronsted-Lowry Acids & Bases conjugate acid - receives the donated proton (H+ ion) conjugate base- what is left of the acid after donating H+ These guys are on the right side of the equation

  17. H3PO4 + H2O <-----> H2PO41- + H3O1+ Hydrogen neutral atom ion (lost one electron)

  18. How water self-ionizes + H + H O - - + H + H O + - - H O - - + + H H - + - H + H O - O - + H + + H H + + H H O O + - - H - - + H O - -

  19. Bronsted-Lowry Acids & Bases self-ionizationofwater reverse

  20. Bronsted-Lowry Acids & Bases ionizationofammonia in water reverse

  21. Bronsted-Lowry Acids & Bases ionizationofammonia in water reverse

  22. Steps in the ionization of H3PO4 H3PO4 + H2O <----> H2PO41- + H2O <----> HPO42- + H2O <---->

  23. Guided practice for Ka and Kb CH3COOH + H2O <----> H2S + H2O <----> C2H5NH2 + H2O <----> C6H5NH2 + H2O <---->

  24. Guided practice for Ka and Kb Ka for CH3COOH= Ka for H2S= Kb for C2H5NH2= Kb for C6H5NH2 =

  25. 4/10/2013 Standards: 5 (Acids and Bases) Objectives: ●  Work CST problems with responders for CST Review (q's 65-70) ●  Students will be able to create Ka   Kb   , and pH DO NOW: 1. no responders today 2. What powers of 10 = (a) .001, (b) .000003, (c) .00000000009 HOMEWORK: 1. Ch 19.3 PP's p. 609   18 (a-c), Ch 19 Assess p. 631 87. (a,b); 88 (a,b) (5 pts) Std 5 2. CST Problems 65-70 (5 pts) Std MISC Follow these directions - Copy questions if no calculations and give reasons with page #'s or quote me if I gave explanation; for calculation problems - given, find, and show calcs. =========================================================== STAMPING:   ●  Journal 4/9 1. Ch 19.2 p. 605 10 (a,b,c); 11 (a,b,c,d) (5 pts) Std 5 2. CST Problems 59-64 (5 pts) Std MISC STAPLE

  26. How water self-ionizes + H + H O - - + H + H [H+][OH-] [H2O(l)] O - <====> [H+][OH- ] KW = - + + H + H + O - H + - H H - + H - O - O - + H + H O - - <====> + H + H O + + - H - + H H O - - O + - + - - H - H O compare to graphic 1- page 608 + H 1+

  27. compare #'s for values of pH & pOH in Kw pH = -log [H+] pOH = -log [OH- ] EXAMPLES BELOW pH + pOH = 14 Kw = [H+][OH1- ] = 10-14

  28. Homework Hellp

  29. Problem type for homework on page 609 #18 Kw = divide both sides by [H+]

  30. NOTE: Question 87 a and b are both exactly like questions in #18 on p. 609 Actual HW problem on page 631 #88b Problem Given Find pH = ? [H+] = 5.8 x 10-11 Solution pH = -log [H+] = -log [ 5.8 x 10-11] ( -log [ 5.8 ] ) + ( -log [10-11] ) = 11 ( -log [ 5.8 ] ) + This log only needs to be estimated because it is insignificantly small. Here is what you do: if value = 2-3 = 0.3 if value = 4-6 = 0.7 if value = 7-9 = 0.9 - 0.7 11 + pH = 10.3 So -log [ 5.8 ] estimate = - 0.7 - 0.7

  31. For greater accuracy we need a log table like this one Available on my website by clicking large blue dot below. http://mrwiggersci.com/chem/Tutorials/log-chart_1-10-estimating-logs-antilogs.htm Or by going to http://mrwiggersci.com/chem/Tutorials.aspx Then select > Ch 19 : Acids & Bases > last entry at bottom of this section

  32. Ka Kb Equilibrium constant for an acid Equilibrium constant for an base

  33. Here is pH Meter simulatorthat lets you test pH different acids, bases, and salts. http://group.chem.iastate.edu/Greenbowe/sections/ projectfolder/flashfiles/acidbasepH/ph_meter.html Here is an applet to let you see what happens in a "buffered" solution http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/buffer12.swf

  34. 4/11/2013 Standards: 5 (Acids and Bases) Objectives: ●  Polish skill gained so far in Ch 19.1-19.3 DO NOW: 1. Due end of the period (7 pts) Std 5 Ch 19 Assess - p. 630 Copy questions, if multiple questions, do them all: 40-43, 46, 50, 52-55, 59, 60, 62-64. (23 questions) HOMEWORK: 1. CST Problems 71-76 (5 pts) Std MISC Follow these directions - Copy questions if no calculations and give reasons with page #'s or quote me if I gave explanation; for calculation problems - given, find, and show calcs. =========================================================== TURNED IN - BASKET: 1. Ch 19.3 PP's p. 609   18 (a-c), Ch 19 Assess p. 631 87. (a,b); 88 (a,b) (5 pts) Std 5 2. CST Problems 65-70 (5 pts) Std MISC STAPLE

  35. 4/12/2013 Standards: 5 (Acids and Bases) Objectives: ●  CST's 77-82 - Responders - will do Q's 77-80 only ●  Students will be able to calc. pH and pOH ●  Students will be able to use pH + pOH = 14 to convert pH to pOH DO NOW: 1. Review p. 609-611 18 (all) and 87 & 88 (all) and be ready to tell me problems you don't fully understand. HOMEWORK: 1. Ch 19.3 Ch 19.2 p. 611-613 19 (a,b,c); 20 (a,b,c) (5 pts) Std 4 2. CST Problems 77-82 (5 pts) Std MISC Follow these directions - Copy questions if no calculations and give reasons with page #'s or quote me if I gave explanation; for calculation problems - given, find, and show calcs. =========================================================== STAMPED:   ●  Journal 4/11 (what you learned FROM your fellow students, or what you taught to other students.) 1. CST Problems 71-76 (5 pts) Std MISC

  36. Announcement - regarding CST's Chemistry CST from Wigger happens 4/23 100 points (50 questions) Armenian Genocide Remembrance Assembly happens 4/24 Chemistry CST from State of Calif. happens 4/25 4th day of testing

  37. Estimates to use when calculating logs: if value = 2-3 <--> 0.3 if value = 4-6 <--> 0.7 if value = 7-9 <--> 0.9 If [H+] = 1.0 x 10-4 needs no estimates, simply pH of this conc = 4.0 If [H+] = 6.2 x 10-11 needs estimate for the 6.2 estimate would -0.7 + 11 = 10.3

  38. Estimates to use when calculating logs: if value = 2-3 <--> 0.3 if value = 4-6 <--> 0.7 if value = 7-9 <--> 0.9 If [H+] = 1.0 x 10-4 needs no estimates, simply pH of this conc = 4.0 If [H+] = 6.2 x 10-11 needs estimate for the 6.2 estimate would -0.7 + 11 = 10.3

More Related