Archive – week 9 – 20 – 21
Week of 11/2 – 11/6
*Please REFRESH this Page every time you view!!!
The 4 day – A, B, C, D cycle looks like this:
Day Period
2 3 4
In class: A Lab Lab Single Class
Remote: Lab Lab Single Class
Monday In class: B Single Class LAB LAB
Remote: Single Class LAB LAB
In class: C Single Class LAB LAB
Remote: Single Class LAB LAB
In class: D Lab Lab Single Class
Remote: Lab Lab Single Class
This weeks 5 day Schedule:
11/2 – Monday- “B” Day –period 2, – I 2(B,D) 3(D) AP CHEMISTRY
– period 2, – R 2(B,D) 3(D) REMOTE INSTRUCTION
-period 3,4 (LAB) – I 3(B) 4(B,D) AP CHEMISTRY
-period 3,4 (LAB) – R 3(B) 4(B,D) REMOTE INSTRUCTION
11/3 – Tuesday – “C” Day – period 2, – I 2(A,C) 3(A) AP CHEMISTRY
–period 2, – R 2(A,C) 3(A) REMOTE INSTRUCTION
-period 3,4 (LAB) – I. 3(C) 4(A,C) AP CHEMISTRY
-period 3,4 (LAB) – R 3(C) 4(A,C) REMOTE INSTRUCTION
11/4 – Wednesday- “D” Day – period 2,3 (Lab) – I 2(B,D) 3(D) AP CHEMISTRY
– period 2,3 (Lab) – R 2(B,D) 3(D) REMOTE INSTRUCTION
-period 4 – I 3(B) 4(B,D) AP CHEMISTRY
-period 4 – R 3(B) 4(B,D) REMOTE INSTRUCTION
11/5 – Thursday “A” Day – period 2,3 (Lab) – I 2(A,C) 3(A) AP CHEMISTRY
–period 2,3 (Lab) – R 2(A,C) 3(A) REMOTE INSTRUCTION
-period 4 – I 3(C) 4(A,C) AP CHEMISTRY
-period 4 – R 3(C) 4(A,C) REMOTE INSTRUCTION
11/6 – Friday- “B” Day –period 2, – I 2(B,D) 3(D) AP CHEMISTRY
– period 2, – R 2(B,D) 3(D) REMOTE INSTRUCTION
-period 3,4 (LAB) – I 3(B) 4(B,D) AP CHEMISTRY
-period 3,4 (LAB) – R 3(B) 4(B,D) REMOTE INSTRUCTION
11/2 – Monday- “B” Day – period 2, – I 2(B,D) 3(D) AP CHEMISTRY
– period 2, – R 2(B,D) 3(D) REMOTE INSTRUCTION
-period 3,4 (LAB) – I 3(B) 4(B,D) AP CHEMISTRY
-period 3,4 (LAB) – R 3(B) 4(B,D) REMOTE INSTRUCTION
The Blue team and the Orange team are remote today. Please move to the Remote Instruction Page.
Red and Green teams: Pages 1 – 6 are due Monday November 2nd in class.
The rest of the test will be due Wednesday, November 4th.
Period 2, Period 3:
1. Test 2 continues –
2. Measure your heated salt solutions from Last Thursday for Lab 9 – (RED Team)
Red and Green teams: Pages 1 – 6 are due today in class by the end of the period.
Last class periods for the test
Period 4:
Lab 9 – Analysis of Carbonates- Determination of sodium carbonate or sodium hydrogen carbonate
baking soda washing soda
Added HCL on Sample A or Sample B
Evaporation of water to obtain mass of product (NaCl)
11/2 Monday “B” Day – Homework
1. Continue with test 2 –
BLUE and Orange teams: Both parts of the test are due Tuesday November 3rd in class.
Red and Green teams: Pages 7 + The will be due Wednesday, November 4th in class
2. Please work on Lab 9 – (Orange Team)
a) Complete the 2 chemical reactions and stoichiometry problems to determine the grams of sodium chloride produced.
b) Determine the percent yield of sodium chloride.
c) There is no conclusion for this lab.
End Of Monday..
11/3 – Tuesday – “C” Day – period 2, – I 2(A,C) 3(A) AP CHEMISTRY
–period 2, – R 2(A,C) 3(A) REMOTE INSTRUCTION
-period 3,4 (LAB) – I. 3(C) 4(A,C) AP CHEMISTRY
-period 3,4 (LAB) – R 3(C) 4(A,C) REMOTE INSTRUCTION
The Red Team and the Green Team are Remote today. Please move to the remote instruction page.
Period 2, Period 3:
1. Test 2 completion – Last class period for test 2.
2. Blue team – measure your dried salt solutions from Friday – Lab 9
Period 4 (LaB):
1: We will complete the data collection for the lab.
Lab 9 – Analysis of Carbonates- Determination of sodium carbonate or sodium hydrogen carbonate
baking soda washing soda
Added HCL on Sample A or Sample B
Evaporation of water to obtain mass of product (NaCl)
11/3 – Tuesday – “C” Day Homework:
1. Please complete Lab 9 –
a) Please Q – out or X – out the last question on conclusion page. Instead of answering that
question please show me your percent yield calculation.
Red team – Your measured evaporating dish and NaCl salt is posted in the remote page.
I let you guys continue with the test in your single period yesterday.
Green Team – You completed all measurements in class Monday.
Blue Team – Measured your evaporating dish and NaCl salt in class today.
Orange Team – You completed the lab in class today!
Red team/Green Team : Lab 9 due tomorrow in class!
Blue Team/Orange Team: Lab 9 due Thursday in class!
b) FULL REMOTE STUDENTS:
Please watch the video of the lab and pick either measurement A or B to complete the Lab.
Lab 9 – Review:
End of Tuesday!
11/4 – Wednesday- “D” Day – period 2,3 (Lab) – I 2(B,D) 3(D) AP CHEMISTRY
– period 2,3 (Lab) – R 2(B,D) 3(D) REMOTE INSTRUCTION
-period 4 – I 3(B) 4(B,D) AP CHEMISTRY
-period 4 – R 3(B) 4(B,D) REMOTE INSTRUCTION
The Blue Team and the Orange Team are Remote today. Please move to the Remote Instruction Page.
Period 2, Period 4 – Class Lectures –
1. Hand in final pages of the Test 2 –
2. Acid/Base basics (no pun intended…ok maybe) – Stoichiometry through Acid/Base reactions.
Demos – magnesium hydroxide, electrolyte
a). Strong Bases – weak bases Table F
Coulombs Law!
b). Acid and base definition introduction
Why acids are dangerous? – what is the action of H+
Why bases are dangerous? – What is the action of OH–
Neutralization reaction – example : OH- from Mg(OH)2
c). Conductivity of metals – mobile electrons
d). Electrolyte definitions – mobile ions
Strong ACids and Bases are strongest electrolytes
Salts that are soluble are electrolytes in (aq) and (l) phases only
Stiochiometry is with Strong Acids or Strong Bases – (completion reactions)
Weak acids/Weak bases do not completely dissociate.
Vinegar (organic acid) weak acid = structure
e) Strong Acids – from Halogens – why HF is weak and why HCl, HBr, HI are strong?
Coulombs LAW!!!!
Milk of Magnesia = Mg(OH)2 Drano = NaOH
 |
 |
Both produce OH- ions but one is dangerous why?
Demo: Electrolyte, Salts, Acids, and Bases, NOT WATER, NOT SOLID Salts
Demo: Solubility of a non-electrolyte – using an Acid!
Period 3:
1. Continue with Lecture.
2. Start or begin Homework.
Period 2 Lesson – part 1:
Period 2 Lesson – part 2:
11/4 – Wednesday- “D” Day – Homework
1 . Please complete the form below on todays lecture.
I posted today’s lectures above if you forgot what I discussed today.
– You have 3 submissions and the form is on auto-grade.
Intro Acid Base Form:
End of Wednesday..
NaCl (s) |
Ionic solids – NOT Electrolytes! (positive and negative ions locked in a crystal) They are never electrolytes because the do not conduct electricity in solution or as a liquid. The ions ARE NOT FREE and thus cannot move. It is the movement of ions that will enable them to conduct a charge. All ionic compounds are a solid at STP due to STRONG COULOMBIC Attractions between the positive and negative ions. Each ion is actually surrounded by 6 other oppositely charged ions that keep the ions in a very stable (low energy) structure. |
 |
Ionic liquids – Electrolytes These liquids require very high temperatures to occur as the ions would want to attract to each to form a crystal at lower temperature BUT at these high temperatures these liquids (of negative and positive ions) can conduct because the ions are free to move! |
NaCl (s) —–> Na+(aq) + Cl– (aq) |
Ionic solutions – Electrolytes
These solutions ARE electrolytes! The ions although surrounded by water, are free to move and thus charge can be conducted through. the solution. IF the ionic solid is insoluble then it will not make a solution and the ions will still be locked in a crystal which will result in no charge being conduced |
Sucrose (s) |
Molecular compounds – NOT Electrolytes!
These are made from nonmetals (small atoms) with a high attraction for electrons. These compounds make bonds by fighting for electrons between atoms since they all have high attraction for electrons. Each bond — is a pair of electrons between these atoms. Because of the “tug of war” for electrons between these compounds, these electrons are not free to move and conduct a charge. In fact because the electrons are held so tightly these compounds are so poor at conducting we call them insulators. Molecular compounds NEVER conduct as a solid or in a solution (even if they dissolve). |
Metallic compounds – Fe (s) |
Metallic compounds – NOT electrolytes These compounds do conduct in the solid state because they are made of metals (large atoms with a low attraction for their electrons) and thus allow the electrons in their outer most shell to “roam” throughout the crystal. They unlike molecular compounds have loosely held electrons and thus these electrons are allowed to move freely. Free moving charges conduct electricity!! We say that metallic compounds have a sea of mobile electrons in a crystal of positive nuclei. Do not confuse the positive circles with ions as they are the nuclei of the atoms. |
So electrolytes are compounds that conduct electricity as FREE IONS!
a) IONIC compounds (salts) that are melted (molten)
b) IONIC compounds (salts) that are dissolved
c) Base solutions – FREE OH– ions
d) Acid solutions – Free H+ ions
NOT Electrolytes:
a) Molecular compounds
b) Metallic compounds
11/5 – Thursday “A” Day – period 2,3 (Lab) – I 2(A,C) 3(A) AP CHEMISTRY
–period 2,3 (Lab) – R 2(A,C) 3(A) REMOTE INSTRUCTION
-period 4 – I 3(C) 4(A,C) AP CHEMISTRY
-period 4 – R 3(C) 4(A,C) REMOTE INSTRUCTION
The Red Team and the Green Team are remote today. Please move to the Remote Instruction Page.
Period 2, Period 4 – Class Lecture –
Completed Demo with what an electrolyte is using examples from form
1. Review of Electrolytes and Non-electrolytes – Demo – notes above
1. Complete Acid Base definitions – NOT including ions from salts
2. Weak acid base equilibria, Conjugate Acid, Conjugate Base
Period 3:
1. Continued with the Intro packet.
2. Started homework.
Today’s period 3 lecture:
11/5 – Thursday “A” Day Homework –
THIS MAY CHANGE BASED ON HOW FAR WE GET IN CLASS!! Always refresh!
PLEASE NOTE WHICH CLASS YOU ARE AND YOUR HOMEWORK BELOW!
Period 2/3: Blue and Red teams
1. View lecture below (start at 14:40 to 37:50) and Complete Page 2 of the Acid base Intro Packet and review with the key below (after watching the video):
2. NOW complete the third reaction on the Conjugate Acid Base Pairs and Complex ions new.pdf
and review with the key below:
Period 4: Orange and Green
1. Complete first 2 reactions in the of the Conjugate Acid Base Pairs and Complex ions new.pdf worksheet and review with the key posted above.
2. View lecture below (start at 14:40 to 37:50) and Complete Page 2 of the Acid base Intro Packet and review with the key below (after watching the video):
3. NOW complete the third reaction on the Conjugate Acid Base Pairs and Complex ions new.pdf
and review with the key below:
Today’s Lesson sort of : (START at 14:40 for both classes and END at 37:50!)
End Wednesday..
11/6 – Friday- “B” Day –period 2, – I 2(B,D) 3(D) AP CHEMISTRY
– period 2, – R 2(B,D) 3(D) REMOTE INSTRUCTION
-period 3,4 (LAB) – I 3(B) 4(B,D) AP CHEMISTRY
-period 3,4 (LAB) – R 3(B) 4(B,D) REMOTE INSTRUCTION
The Blue team and the Orange Team are Remote today. Please move to the Remote Instruction Page.
Period 2, Period 3,4 – Class Lessons
1. Review of Page 2 of the intro packet.
2. Review of the weak acid/base equilibrium – Identified Conjugate Acids, Bases and Conjugate Pairs
3. Continue with Intro Acid Bases Packet Key 1718 p.pdf – complete page 1
strength of acids, Ka – ability of the conjugate base to recreate the acid
– pH probe demo with straw and washing soda
Completed Page 1 of intro packet!
This is the mechanism of how CO2 acts an acid by the the Lewis Definition.
The most complete definition is the Lewis acid base definition because there are acids and bases that DO NOT HAVE protons to donate or possibly accept BUT create acidic conditions or Basic Conditions.
In table K they list CO2 an acid but it had no protons to donate? It is an acid because when we bubble CO2 in water the conditions in water become more acidic.
CO2 + H2O ——> intermediate ——> H2CO3
H2CO3 + H2O ——> H3O+ + HCO3 -1
CO2 can accept a pair if electrons (JUST LIKE a proton!!!) so the best and most complete definition of acids and bases is the LEWIS acid base definitions! Lewis acids like CO2 are electron acceptors while bases like water in the example are electron donators!!
4. Demo with straw and pH probe.
Back to the pumpkin Stoichiometry from last week:
 |
C2H2 (g) + 5/2O2 (g) —> 2CO2 (g) + H2O (g) 0r
2C2H2 (g) + 5 O2 (g) —> 4CO2 (g) + 2H2O (g)
|
The chemical reaction that exploded the pumpkin was combustion or redox but the reaction the made fuel, C2H2 was?
What kind reaction is this?
CaC2 (s) + 2H2O (l) —–> C2H2 (g) + Ca(OH)2
The Arrhenius definition although a good start to defining acids and bases is not complete because we have chemicals that do not have any hydroxide ions in their structure (like NaOH) but will create acidic or basic conditions in water. In the case above, the hydroxide ion (OH–) was produced by the action of the carbide ion (C2-2). So the Bronsted-Lowry definition is a more complete definition because it includes those chemical species that Produce the Basic or Acidic conditions by Accepting a proton or donating a proton.
In the case above the carbide ion (C2-2) ion is the Bronsted-Lowry base (the carbide ion accepted the proton.) and the water is the Bronsted- Lowry acid (because water DONATED A PROTON) (
*Notice that acids must have electron deficient hydrogen to donate protons (H+).
*Notice that Bases must have an ability to accept protons (H+). Having a lone pair of electrons or having a negative charge helps attract the protons!
The result of this acid base reaction is that acetylene C2H2 was produced.
5. Auto ionization of water – pH, pOH
a) Demo – pH probe demo with straw and washing soda
Pictures of the pool chemicals
copper ions pH probe
b) Started Pages 3 and 4 of the intro packet.
 |
 |
Chemical indicator Presentation:
Today’s lesson period 2 or period 3: Review of Arrhenius, Bronsted- Lowry, – Lewis Acids intro
Today’s lesson period 4: pH, pOH, Kw, pKw
11/6 – Friday- “B” Day – Weekend Homework
1. Read the Connections Note below.
2. Please complete pages 1 – 4 in the Acid Base intro Packet:
Please skip the questions that ask for color in the last page.
a) The Blue and RED team will need to view the Today’s lesson period 4 class lecture posted above
the homework in order to know how to complete the last 2 pages.
b) Review with the key below:
3: Study for a RAT (quiz) Monday on:
A: the acid/base definitions (identify acids and bases)
B: Strength of acids/bases based on Table L
C: Conjugate Acid base pairs recognition
D: Acid / base calculations, page 3 and 4.
END of Week 9!
Todays *Connections– Stoichiometry (mole ratio) continues with Acid/Base Reactions. The connection we need to make is that salts that are soluble and that produce a hydroxide ion (OH–) into an aqueous solution are bases. These are important ions because they can upset the balance of H+ and OH– in water. Remember that these are naturally occurring ions that occur in water. This called auto-ionization of water.
H2O (l) → H+ (aq) + OH– (aq) Kw = 1 x 10-14
Proton Hydroxide
or
H2O (l) + H2O (l) → H3O+ (aq) + OH– (aq) Kw = 1 x 10-14
Hydronium Hydroxide
From 2 reactions above which are really the same you can see ONE H+ or H3O+ for every ONE OH–.
Acids will increase the H+ or the H3O+ concentration above normal* conditions.
Bases will increase the OH– concentration above normal* conditions.
*Normal conditions refer to water that is NEUTRAL : ( H+ or the H3O+ = OH– ) = pH = 7
H2O (l) → H+ (aq) + OH– (aq)
H2O (l) + H2O (l) → H3O+ (aq) + OH– (aq)
Keq = [Products] = Kw = [H+ / H3O+][OH–]
[Reactants]
*We can use H3O+ and H+ interchangeably. I will write H+ going forward but remember I can use H3O+ at any time and it would mean the same thing. (Whether you have a free proton or a a proton held by water does not matter)
Now the value of Kw (equilibrium constant for the auto-ionization of water) equals = Kw = 1 x 10-14
Kw = [H+ ] x [OH–]
1 x 10-14 = [H+] x [OH–]
If one H+ dissociates for every ONE OH– : H2O (l) → H+ (aq) + OH– (aq) then:
1 x 10-14 = [H+] x [OH–]
1 x 10-14 = [1 x 10-7] x [1 x 10-7 ]
As you can see the concentration (molarity, M) of H+ and OH– ARE THE SAME IN PURE WATER!
They must be the same concentration to equal 1 x 10-14 !
Remember when you multiply exponents you add!
*THIS is WATER AT NORMAL CONDITIONS.
Now we use a convention to measure this balance or unbalance of ions in water. It is called pH.
pH = – log (base 10) of the H+ or H3O+ concentration.
Pure water at 4 degrees Celsius the [H+] or [H3O+] = 1 x 10-7
if you put -log (1 x 10-7) in your calculator you will get : pH = 7
So basically pH is a numerical system that measures “stuffs” the entire concentration (small value) into a exponent (base 10) AND MAKES IT positive for Ease
pH = – log [H+]
a)What if the [H+] = 1 x 10-5 ? What is the pH? Is this an acid, basic or neutral solution?
b)What if the [H+] = 0.001 ? What is the pH? Is this an acid, basic or neutral solution?
c)What if we have a [HCl] = 0.1 M What is the pH? Is this an acid, basic or neutral solution?
d)What if we have a [HCl] = 5.6 x 10-6 What is the pH? Is this an acid, basic or neutral solution?
e)What if you have [NaOH] = 0.001 What is the pH? Is this an acid, basic or neutral solution?
e)What if you have [NaOH] = 3.34 x 10-5 What is the pH? Is this an acid, basic or neutral solution?
*Notice the above problems are strong Acids and Base, which means complete dissociation.
answers on bottom of page..
Screencast that reviews acid/base definitions, Strength of acid/Base and pH problems:
END of Week 9!
Answers for question in notes above.
a) pH = 5 Acidic solution (below 7)
b) pH = 3 Acidic solution (below 7)
c) pH = 1 Acidic solution (below 7)
d) pH = 5.25 Acidic solution (below 7)
e) pOH = 3 thus pH = 14 – 3 = pH = 11 Basic solution (above 7 – more OH– than H+)
f) pOH = 4.48 thus pH = 14 – 4.48 = 9.52 Basic solution (above 7 – more OH– than H+)
Remote Instruction:
11/2 – Monday- “B” Day – period 2, – I 2(B,D) 3(D) AP CHEMISTRY
– period 2, – R 2(B,D) 3(D) REMOTE INSTRUCTION
-period 3,4 (LAB) – I 3(B) 4(B,D) AP CHEMISTRY
-period 3,4 (LAB) – R 3(B) 4(B,D) REMOTE INSTRUCTION
The Blue team and the Orange team are remote today.
Zoom Stream info – Period 2:
Topic: AP Chemistry 11.02 – Period 2
Time: Nov 2, 2020 08:00 AM Eastern Time (US and Canada)
Join Zoom Meeting
https://us02web.zoom.us/j/89726289790?pwd=S05YVVliUjFidlhiaUN1UkNqQWV6QT09
Meeting ID: 897 2628 9790
Passcode: q9pQyE
One tap mobile
+16465588656,,89726289790#,,,,,,0#,,875422# US (New York)
Zoom Stream info – Period 3:
Topic: AP Chemistry – 11.02 – period 3
Time: Nov 2, 2020 09:00 AM Eastern Time (US and Canada)
Join Zoom Meeting
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Meeting ID: 850 6849 9661
Passcode: 1xzcMN
One tap mobile
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Period 2, Period 3:
1. Test 2 continues –
2. Measure your heated salt solutions from Last Thursday for Lab 9 – (RED Team)
Blue team will measure tomorrow in class
Period 4:
1. Test 2 continues –
BLUE and Orange teams: Both parts of the test are due Tuesday November 3rd in class.
2. Students in class today will perform the Lab 9 but those at home will complete tomorrow.
3. Full REMOTE Students please watch the video below to gather data for lab 9:
Lab 9 – Analysis of Carbonates- Determination of sodium carbonate or sodium hydrogen carbonate
baking soda washing soda
Added HCL on Sample A or Sample B
Evaporation of water to obtain mass of product (NaCl)
Lab 9 Video: There was a problem with the original video so I have a new new version below!
Please move to the week 9 page to view the homework.
11/3 – Tuesday – “C” Day – period 2, – I 2(A,C) 3(A) AP CHEMISTRY
–period 2, – R 2(A,C) 3(A) REMOTE INSTRUCTION
-period 3,4 (LAB) – I. 3(C) 4(A,C) AP CHEMISTRY
-period 3,4 (LAB) – R 3(C) 4(A,C) REMOTE INSTRUCTION
The Red Team and the Green Team are Remote today.
Zoom Stream info – Period 2:
Topic: AP Chemistry – 11.03 – period 2
Time: Nov 3, 2020 08:00 AM Eastern Time (US and Canada)
Join Zoom Meeting
https://us02web.zoom.us/j/88259732865?pwd=bjNTUCtGOUJ2SDhHR2twS01EeTJ0dz09
Meeting ID: 882 5973 2865
Passcode: sV8s0u
One tap mobile
+16465588656,,88259732865#,,,,,,0#,,138315# US (New York)
Zoom Stream info – Period 3:
Topic: AP Chemistry – 11.03 – period 3 – 4
Time: Nov 3, 2020 09:00 AM Eastern Time (US and Canada)
Join Zoom Meeting
https://us02web.zoom.us/j/83823686714?pwd=RWlZa01nS2ZSR2tzRysvMDhTem1hUT09
Meeting ID: 838 2368 6714
Passcode: Zs8KBP
One tap mobile
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Period 2, Period 3:
1. Test 2 completion – Last class period for test 2.
2. The Blue team (in class students) will – measure their dried salt solutions from Friday – Lab 9
2. Red team – Your measured evaporating dish and NaCl salt is posted in the remote page.
You guys need to grab these final measurements to complete the lab, which is due tomorrow in class.
Please cross out the last question in the conclusion page and instead show me a percent yield calculation.
Measurements:
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No name on the evaporating Dish!
|
Megan and Jack: |
–Tl ?? |
Up close and personal in one of the evaporating dishes:
Can you see the simple cubic structure? NaCl is also called Halite or Rock salt!
Period 4 (LaB):
The green team should use this time to complete the lab 9 as yesterday you completed all measurements for the lab. This lab is due tomorrow in class.
Please cross out the last question in the conclusion page and instead show me a percent yield calculation.
Lab 9 – Analysis of Carbonates- Determination of sodium carbonate or sodium hydrogen carbonate
baking soda washing soda
Added HCL on Sample A or Sample B
Evaporation of water to obtain mass of product (NaCl)
b) FULL REMOTE STUDENTS:
Please watch the video of the lab and pick either measurement A or B to complete the Lab.
Please cross out the last question in the conclusion page and instead show me a percent yield calculation.
Make sure you view the week 9 page to view the homework.
11/4 – Wednesday- “D” Day – period 2,3 (Lab) – I 2(B,D) 3(D) AP CHEMISTRY
– period 2,3 (Lab) – R 2(B,D) 3(D) REMOTE INSTRUCTION
-period 4 – I 3(B) 4(B,D) AP CHEMISTRY
-period 4 – R 3(B) 4(B,D) REMOTE INSTRUCTION
The Blue Team and the Orange Team are Remote today.
Zoom Stream info – Period 2:
Topic: AP Chemistry – 11.04 – Period 2
Time: Nov 4, 2020 08:00 AM Eastern Time (US and Canada)
Join Zoom Meeting
https://us02web.zoom.us/j/89253213533?pwd=UEQwQlFCa2JVa3ZpbHV3MFhjejd0UT09
Meeting ID: 892 5321 3533
Passcode: s1bwKA
One tap mobile
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Zoom Stream info – Period 3:
Topic: AP chemistry – 11.04 – period 3 – 4
Time: Nov 4, 2020 09:30 AM Eastern Time (US and Canada)
Join Zoom Meeting
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Meeting ID: 835 0074 4517
Passcode: rTHW5i
One tap mobile
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Period 2, Period 4 – Class Lectures –
1. The other class will Hand in final pages of the Test 2 –
2. Acid/Base basics (no pun intended…ok maybe) – Stoichiometry through Acid/Base reactions.
Demos – magnesium hydroxide, electrolyte
a). Strong Bases – weak bases Table F
Coulombs Law!
b). Acid and base definition introduction
Why acids are dangerous? – what is the action of H+
Why bases are dangerous? – What is the action of OH–
Neutralization reaction – example : OH- from Mg(OH)2
c). Conductivity of metals – mobile electrons
d). Electrolyte definitions – mobile ions
Strong ACids and Bases are strongest electrolytes
Salts that are soluble are electrolytes in (aq) and (l) phases only
Stiochiometry is with Strong Acids or Strong Bases – (completion reactions)
Weak acids/Weak bases do not completely dissociate.
Vinegar (organic acid) weak acid = structure
e) Strong Acids – from Halogens – why HF is weak and why HCl, HBr, HI are strong?
Coulombs LAW!!!!
Milk of Magnesia = Mg(OH)2 Drano = NaOH
Demo: Electrolyte, Salts, Acids, and Bases, NOT WATER, NOT SOLID Salts
Demo: Solubility of a non-electrolyte – using an Acid!
Period 3:
1. Continue with Lecture.
2. Start or begin Homework.
11/5 – Thursday “A” Day – period 2,3 (Lab) – I 2(A,C) 3(A) AP CHEMISTRY
–period 2,3 (Lab) – R 2(A,C) 3(A) REMOTE INSTRUCTION
-period 4 – I 3(C) 4(A,C) AP CHEMISTRY
-period 4 – R 3(C) 4(A,C) REMOTE INSTRUCTION
The Red Team and the Green Team are remote today.
Zoom Stream info – Period 2,3:
Topic: AP Chemistry – 11.05 – period 2,3
Time: Nov 5, 2020 08:00 AM Eastern Time (US and Canada)
Join Zoom Meeting
https://us02web.zoom.us/j/85626919409?pwd=S3hVWFhWbWRjNnpnaWRSTTIxMHR4QT09
Meeting ID: 856 2691 9409
Passcode: iDrZd4
One tap mobile
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Zoom Stream info – Period 4:
Topic: AP Chemistry – 11.05 – period 4
Time: Nov 5, 2020 09:30 AM Eastern Time (US and Canada)
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Period 2, Period 4 – Class Lecture –
Completed Demo with what an electrolyte is using examples from form
1. Review of Electrolytes and Non-electrolytes – Demo – notes above
1. Complete Acid Base definitions – NOT including ions from salts
2. Weak acid base equilibria, Conjugate Acid, Conjugate Base
3. strength of acids, Ka – ability of the conjugate base to recreate the acid
– pH probe demo with straw and washing soda
Completed Page 1 of intro packet!
This is the mechanism of how CO2 acts an acid by the the Lewis Definition.
The most complete definition is the Lewis acid base definition because there are acids and bases that DO NOT HAVE protons to donate or possibly accept BUT create acidic conditions or Basic Conditions.
In table K they list CO2 an acid but it had no protons to donate? It is an acid because when we bubble CO2 in water the conditions in water become more acidic.
CO2 + H2O ——> intermediate ——> H2CO3
H2CO3 + H2O ——> H3O+ + HCO3 -1
CO2 can accept a pair if electrons (JUST LIKE a proton!!!) so the best and most complete definition of acids and bases is the LEWIS acid base definitions! Lewis acids like CO2 are electron acceptors while bases like water in the example are electron donators!!
Period 3:
1. Continued with the Intro packet.
2. Started homework.
Please move to the week nine page to view the homework.
11/6 – Friday- “B” Day –period 2, – I 2(B,D) 3(D) AP CHEMISTRY
– period 2, – R 2(B,D) 3(D) REMOTE INSTRUCTION
-period 3,4 (LAB) – I 3(B) 4(B,D) AP CHEMISTRY
-period 3,4 (LAB) – R 3(B) 4(B,D) REMOTE INSTRUCTION
The Blue team and the Orange Team are Remote today.
Zoom Stream info – Period 2:
Topic: AP Chemistry – 11.06 – period 2
Time: Nov 6, 2020 08:00 AM Eastern Time (US and Canada)
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Zoom Stream info – Period 3,4:
Topic: AP Chemistry – 11.06 – period 3,4
Time: Nov 6, 2020 09:00 AM Eastern Time (US and Canada)
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Period 2, Period 3,4 – Class Lessons
1. Review of Page 2 of the intro packet.
2. Review of the weak acid/base equilibrium – Identified Conjugate Acids, Bases and Conjugate Pairs
3. Continue with Intro Acid Bases Packet Key 1718 p.pdf – complete page 1
strength of acids, Ka – ability of the conjugate base to recreate the acid
– pH probe demo with straw and washing soda
Completed Page 1 of intro packet!
This is the mechanism of how CO2 acts an acid by the the Lewis Definition.
The most complete definition is the Lewis acid base definition because there are acids and bases that DO NOT HAVE protons to donate or possibly accept BUT create acidic conditions or Basic Conditions.
In table K they list CO2 an acid but it had no protons to donate? It is an acid because when we bubble CO2 in water the conditions in water become more acidic.
CO2 + H2O ——> intermediate ——> H2CO3
H2CO3 + H2O ——> H3O+ + HCO3 -1
CO2 can accept a pair if electrons (JUST LIKE a proton!!!) so the best and most complete definition of acids and bases is the LEWIS acid base definitions! Lewis acids like CO2 are electron acceptors while bases like water in the example are electron donators!!
4. Demo with straw and pH probe.
Back to the pumpkin Stoichiometry from last week:
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C2H2 (g) + 5/2O2 (g) —> 2CO2 (g) + H2O (g) 0r
2C2H2 (g) + 5 O2 (g) —> 4CO2 (g) + 2H2O (g)
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The chemical reaction that exploded the pumpkin was combustion or redox but the reaction the made fuel, C2H2 was?
What kind reaction is this?
CaC2 (s) + 2H2O (l) —–> C2H2 (g) + Ca(OH)2
The Arrhenius definition although a good start to defining acids and bases is not complete because we have chemicals that do not have any hydroxide ions in their structure (like NaOH) but will create acidic or basic conditions in water. In the case above, the hydroxide ion (OH–) was produced by the action of the carbide ion (C2-2). So the Bronsted-Lowry definition is a more complete definition because it includes those chemical species that Produce the Basic or Acidic conditions by Accepting a proton or donating a proton.
In the case above the carbide ion (C2-2) ion is the Bronsted-Lowry base (the carbide ion accepted the proton.) and the water is the Bronsted- Lowry acid (because water DONATED A PROTON) (
*Notice that acids must have electron deficient hydrogen to donate protons (H+).
*Notice that Bases must have an ability to accept protons (H+). Having a lone pair of electrons or having a negative charge helps attract the protons!
The result of this acid base reaction is that acetylene C2H2 was produced.
5. Auto ionization of water – pH, pOH
a) Demo – pH probe demo with straw and washing soda
Pictures of the pool chemicals
copper ions pH probe
b) Started Pages 3 and 4 of the intro packet.
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Chemical indicator Presentation: