NO SCHOOL Te acher training
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Transcript of NO SCHOOL Te acher training
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NO SCHOOL
Teacher training
4/8/13
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STAPLE4/9/2013 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 BaseHOMEWORK: 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 givereasons 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
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Monday April 22 - Mr. Wigger'sCST
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Page 601 - Ch 19.1 Assess Answers
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DO NOW FIRST
HCl HNO3
STRONG ACIDS
H2SO4 HClO4
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Metal with OH-
STRONG BASES
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page 601answers
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Reviewing Keq
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1 In the expression below, what is letter ________ ?
A reactant
B product
C coefficient
D concentration
E exponent
F identifies substance
G all of these
a A b B c C d D
aA + bB -----> cC + dD
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2 In the expression below, what is letter ________ ?
A reactant
B product
C coefficient
D concentration
E exponent
F identifies substance
G all of these
Keq =
[A]a[B]b
[C]c[D]d
a A bB
c C d D
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CST Questions59-64
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Demonstration of strong & weak acids using conductivity light:Page 602
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Page 603What does a STRONG acid look like?
What does a WEAK acid look like?
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Species - not like biology. They are any molecule or ion.
Examples:
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Acid ====> Proton Donor
Base ====> Proton Acceptor
(H+ ion is a proton)
Bronsted-Lowry Acids & Bases
These guys are on the left side of the equation
without stamping, this presentation takes one whole period
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conjugate acid - receives the donated proton
(H+ ion)
conjugate base - what is left of the acid after donating H+
Bronsted-Lowry Acids & Bases
These guys are on the right side of the equation
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Hydrogen
neutral atom ion
(lost one electron)
H3PO4 + H2O <-----> H2PO41- + H3O1+
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-
O-
+
H
O
--
+
H
-O-+H
+H
-O-
+
H+
H
-O-+H
+H
-O-+H
+H -O-+H
+H
-O-+ H
+ H
How water self-ionizes
+
H
+
H
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Bronsted-Lowry Acids & Bases
self-ionization of water
reverse
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Bronsted-Lowry Acids & Bases
ionization of ammonia in water
reverse
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Bronsted-Lowry Acids & Bases
ionization of ammonia in water
reverse
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Steps in the ionization of H3PO4
H3PO4 + H2O <---->
H2PO41- + H2O <---->
HPO42- + H2O <---->
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Guided practice for Ka and Kb
CH3COOH + H2O <---->
H2S + H2O <---->
C2H5NH2 + H2O <---->
C6H5NH2 + H2O <---->
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Guided practice for Ka and Kb
Ka for CH3COOH =
Ka for H2S =
Kb for C2H5NH2 =
Kb for C6H5NH2 =
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STAPLE
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) .00000000009HOMEWORK: 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 givereasons 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
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+
H
-
O-
+
H
+
H
O
--+
H
+
H
-O-+H
+H
-O-
+
H+
H
-O-+H
+H
-O-+H
+H
-O-+H
+H
-O-+ H
+ H
How water self-ionizes
+
H
O
--
KW = [H+] [OH-] [H2O(l)] <====> [H+] [OH- ]
+
H
+
H<====>
page 608compare to graphic
-
O-
1-
1+
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pH = -log [H+]
pOH = -log [OH- ]
pH + pOH = 14
Kw = [H+] [OH1- ] = 10-14
compare #'s for values of pH & pOH in Kw
EXAMPLES BELOW
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Homework Hellp
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Problem type for homework on page 609 #18
Kw =
divide both sides by [H+]
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Actual HW problem on page 631 #88b
Given
[H+] = 5.8 x 10-11
Find
pH = ?
NOTE: Question 87 a and b are both exactly like questions in #18 on p. 609
Problem
Solution
pH = -log [H+] = -log [ 5.8 x 10-11]
= ( -log [ 5.8 ] ) + ( -log [10-11] )
11+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 = 0.9So -log [ 5.8 ] estimate = - 0.7
( -log [ 5.8 ] )
- 0.7
- 0.7 11+
pH = 10.3
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For greater accuracy we need a log table like this one
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
Available on my website by clicking large blue dot below.
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Ka
Kb
Equilibrium constant for an acid
Equilibrium constant for an base
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Here is pH Meter simulator that lets you test pH different acids, bases, and salts.
http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/buffer12.swf
Here is an applet to let you see what happens in a "buffered" solution
http://group.chem.iastate.edu/Greenbowe/sections/projectfolder/flashfiles/acidbasepH/ph_meter.html
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STAPLE4/11/2013 Standards: 5 (Acids and Bases)Objectives: ● Polish skill gained so far in Ch 19.1-19.3DO 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 givereasons 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
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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 pOHDO 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 givereasons 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
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Announcement - regarding CST's
Chemistry CST from State of Calif. happens 4/25
Chemistry CST from Wigger happens 4/23
Armenian Genocide Remembrance Assembly happens 4/24
4th day of testing
100 points (50 questions)
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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
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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
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