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## Q1 : Week 10  – 10/31 – 11/4

10/31 – Monday – B Day – 2, 3b Lab/4

Happy Halloween!

Main focus –

a) To perform the analysis of carbonates (lab 9) .

b) To demonstrate Bernoulli’s principle (explanation of the aspirator in vacuum                       filtration).

c) Pumpkin Stoichiometry

Period 2: Collect Take Home quiz #2

1. Review of the 2nd quiz – blue – Test 2 is very soon!.

2. Conclusion writing Review – Lab 7 formal write-up.

3.  Pumpkin Stoichiometry

Period 3/4: Collect Take Home quiz #2

1.  Lab 9 – Analysis of Carbonates Complete all calculations and hand in (No conclusion).

2.  Lab 8 & Lab 9 salt visual comparisons. Can we determine differences in the macro based on the micro.

3. Bernoulli’s principle demos – Discussion of Bernoulli’s principle in explaining how the aspirator                                                                                          works.

4. Review of the 2nd quiz – blue – Test 2 is very soon!.

5.  Pumpkin Stoichiometry

Pumpkin Stoichiometry Presentation:

Pumpkin Stoichiometry: Period 2 – today!

Pumpkin Stoichiometry: Period 4 – today!

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Lab 9 – Analysis of Sodium Carbonate and Sodium Hydrogen Carbonate

Lab 9 – Determine the identity of the carbonate by reacting the 2 salts with HCl to produce NaCl.  How much NaCl is made will determine the identity of the salt.

The salts are either:          Na2CO3     –   sodium carbonate –  washing soda
NaHCO3    –   sodium hydrogen carbonate –  baking soda                                                                                                                                                                                            This a NOT a precipitation analysis lab but it an Analytical Lab as we will use stoichiometry to identify the starting salts by using how much NaCl is produced by reacting them with HCl.
LAB 9 – Unknown carbonates Lab.pdf

Data gathering for Lab:
a) mass out unknown carbonates A or B in an evaporating dish
b) add excess HCl till the reaction reaches completion.
c) place the evaporating dish on a hot plate under the fume hood (evaporating off the water to recover NaCl)
Today:

d) MASS OUT the evaporating dish and the dried NaCl (aq)
e) Determine the experimental mass of NaCl.
f) Determine the Theoretical mass of NaCl produced from each of the possible 2 chemical reactions.
g) Identify the unknown salt based on your calculations.

Lab 9 review:

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10/31 – Monday’s Homework: –

1. Please complete all Labs ( labs 4 – 9). They are all due tomorrow. Lab 6 and 8, 9 do not have conclusions.

LAB 7 – formal write-up is due Friday!!! I will go over the conclusion at some point in class this week

2Study for test 2 – Link to Test 2 Notes

Tomorrow you will have the part of the test that will be very much like the last 2 quizzes and multiple choice questions that are from all our skills learned from Electrochemical cells.

Here are the keys to the 2 take home quizzes (best out of 2) :

New key for this quiz next year. Ions in the box need adjusting. thanks Abby.
Stoichiometry 4c – Precipitation – limiting reagent key p .pdf

Golden Arches Quiz:
Stoichiometry 4a – Precipitation – limiting reagent Key p .pdf

11/1 – Tuesday – A Day  – 2, 3a Lab/4

Main focus –

a) To start part 1 and part 2 of  Exam 2 – analytical.

Period 2/3a-

1.  Hand Back the 2 best out of 2 quizzes (yellow and blue):

2. Completed question 2 of part 1 – (precipitation question like the 2 quizzes we just completed).

3. Started question part 1 which will be finished tomorrow.

4. Pulled question 1 of part 2 – combustion analysis question – take home portion

Period 4-

1.  Hand Back the 2 best out of 2 quizzes (yellow and blue):

2. Started question part 1 which will be finished tomorrow.

3. Pulled question 1 of part 2 – combustion analysis question – take home portion

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11/1 – Tuesday’s Homework: –

1. Please complete the take home portion of the test (question 1 – part 2) that you pulled from your folder today.

This is a combustion analysis question with precipitation analysis to determine the empirical formula of the compound. I am reposting the worksheets and the coorresponding videos that we have previously used if you need to review.  Do not forget it is not what you do first but what you do last!

Lecture 0a below reviews combustion analysis.

Lecture 1.2 below reviews combustion analysis with precipitation analysis

Your take home question has combustion analysis and precipitation analysis combined.We completed these questions in week 8!

Combustion (burning):
A redox reaction (imagine that) that uses O2 as the oxidizing agent on a fuel (normally a hydrocarbon)

C?H?   +    O2       CO2     +     H2O

Notice that combustion is a redox reaction.

Using the law of conservation of mass by Lavoisier and the idea that every unique compound has a unique formula (law of definite proportions by Proust) we can determine the chemical formula of hydrocarbon fuel if we have the mass of the CO2 and  H2O that is produced.  All the carbon from the unknown combines with the oxygen to make CO2 and all the Hydrogen from the unknown comes combines with oxygen to make water.

AP Lecture 0a : Calculating chemical formulas from Combustion analysis (that are obtained through labs).

This video review question 3 of the  Analytical Chemistry I KEY- determining chemical formulas.pdf

Analytical Chemistry II – Mol,Dilution, precipitation analysis.pdf

Analytical Chemistry II KEY NEW – Mol,Dilution, precipitation analysis.pdf

Make New Video for Combustion analysis for next year for multiple samples.

b) Lecture 1.2 : Precipitation analysis

This video reviews these worksheets you should focus on the last 2 questions of side 2:

Analytical Chemistry II – Mol,Dilution, precipitation analysis.pdf

*Check out question 4
Analytical Chemistry II KEY NEW – Mol,Dilution, precipitation analysis.pdf

End of Tuesday..

11/2 – Wednesday – B Day – 2, 3b Lab/4

Main focus –

a)  To continue with our Test 2 – Analytical Chemistry

*You may return to your folder at anytime between today and tomorrow during your off-periods or extra help to work on your test. You can go back to any part of the test EXCEPT for the parts that I am collecting  (Question 1 – part II today, Question 9, part 2 – tomorrow).

Period 2 –

1.  Collect Question 1 of Part 2.

2Part 1 – (pages 1 – 4) and Question 2 of part 2 will be pulled from folders after today.

Period 3b, 4 –
1.  Collect Question 1 of Part 2.

2Part 1 – (pages 1 – 4) and Question 2 of part 2 will be pulled from folders after today.

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11/2 – Wednesday Homework: –

1.  Question 9 – is the take-home portion tonight.  It is due at the start of the class tomorrow.

This question is a lot like our precipitation Lab 8. I have reposted the video that explains Lab 8 which maybe helpful.

Remember it is what you do last to help get yourself started!

Lab 8 review –

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11/3 – Thursday – A Day  – 2, 3a Lab/4

Main focus –

a) To complete Test 2.

b) To dance and frolic when you are done.

Period 2,3,4 –

1.  Complete Test 2

*Because I wanted to give you as much time as possible in class for test 2, I did not have time to review the conclusion writing for Lab 7 – Formal Write-up.  I will do that Monday.  The lab will be due by the end of next week which is the end of Quarter 1.

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11/3 – Thursday Homework: –

The homework is very light this weekend:                                                                Read below:

There is no homework this weekend!

🙂