AP Chem – Q1 – week 8 – 26-27 | Mr. Grodski Chemistry

Q1 : Week 8 – 10/19 – 10/23

<- Week 7 – Week 9 -> Jump to: Tuesday, Wednesday, Thursday, Friday

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Please Make sure Your read all instructions for all assignments.

LAB 7 – Percent by Mass of an hydrate is Due – Late!

LAB 8 – Empirical Formula of a Hydrate is Due – Late

LAB 9 – Empirical formula of copper iodide – Late

LAB 10 – Precipitation Analysis of a Metal Carbonate- Due 10/21

______________________________________________ Jump to: Monday Homework 10/19 – Monday – B Day – 1,2B

Main focus –

a) To review the stoichiometry of how to determine the Limiting Reagent and the Excess Chemical through the Mole Ice Table.

b) To build a stoichiometry table.

c) To use precipitation analysis to identify an unknown group 1 carbonate.

d) To determine the Limiting Reagent in stoichiometry problems.

Period 1,2:

RATIOS – are ratios of “how many” = moles!!!! Most of what we do mathematically will be using these ratios to answer or verify.

Ratios of atoms in compounds —–> chemical formulas

Ratios of each substance in a chemical reaction = Balanced Chemical Reaction –> Predict

Quick Homework Review– connected the problem concepts with stoichiometry of compounds and stoichiometry of chemical reactions

1. Quiz / Form review: (Precipitation analysis Review)

Analytical quiz 1 – Hydrate, precipitation, and Stoich KEY.pdf
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2. Flaming Tube Demo Review –

a) Which reactant was Limiting the reaction?

c) Calculate the Limiting reagent given the worksheet from homework of Thursday.

d) Use the non-chart method (Stoichiometry table) to solve the same problem and “see” the ratios.

What is the Limiting Reagent in this demo? Why isn’t the flame coming out of the tube and burning my room into oblivion?

Limiting reagent intro demo new worksheet.pdf

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Limiting reagent intro demo new worksheet Key.pdf

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3. Review the Molarity limiting reagent homework.

Stoichiometry 3 – Molarity limiting reagent Key.pdf
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4. Introduce the ICE TABLE method of calculating the limiting reagent. Complete side ONLY with me. How could this method made last night’s homework easier?

Limiting reagent intro demo new worksheet.pdf

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5. Modeled the 1st side of Stoichiometry 3 with Ice Table.

Today (in class and live ) I will model the 1st side with the chart method and particulate diagram of ions

Stoichiometry 3 – ICE TABLE (side 1) – Molarity limiting reagent p.pdf View Download

6. Lab 10 –

a) Complete the data collections of Lab 10 – Our precipitate (CaCO3) was in the oven and we measured it mass and it moles.

b) Identification of Sample A or B – Visual identification of the salts, Q and A of the Lab.

c) Complete the Stoichiometry box for Lab 10/ review of homework

1 : The Flaming Tube Demo – for the lecture below!

_________________________________________________________________________________________ Lab 10 – Precipitation Analysis of an Alkali carbonate

Lab 10 – Gravimetric analysis of a metal carbonate NEW 1920.pdf
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Objectives:

1. To identify the formula of a alkali carbonate form by precipitation analysis.

2. To determine the theoretical mass of the precipitate.

3. To determine the percent yield of the precipitate.

1. Lab 8 – Identify the alkali in the original salt of a metal carbonate.

This a precipitation analysis lab where we are identifying the metal salt through the mole ratios of the precipitate. The original salt is either: Li₂CO₃ or Na₂CO₃ or K₂CO₃.

You will identify the original salt by calculating its formula mass through precipitation analysis.

Data gathering for Lab 10 –

Measure your data from Lab 10 – Gravimetric analysis of a metal carbonate.

a) dry out carbonates with microwave.

b) attain dried mass of unknown carbonate.

c) Dissolve in water (about 200ml)

d) Add 125 ml CaCl_{2 solution}

e) filter precipitate with aspirator and Buchner funnel.

f) dry out precipitate (put measured filter paper on watch glass) in oven.

Calculations:

A. TAKE out the precipitate (calcium carbonate) and carefully mass out the filter paper and

precipitate. DO NOT MASS OUT THE WATCH GLASS.

B. Calculate the moles calcium carbonate – Use stoichiometry to relate the moles of the precipitate to

the moles of the original salt (unknown metal carbonate).

C. Calculate the Molecular Mass/Formula Mass of the salt now that we know the grams of the

original dried salt (that was measured in the beginning after it was microwaved) and the moles of

the original salt that was determined above.

D. Determine the unknown formula of the salt given that the metal in the salt could only be

Li, Na, or K. Remember that your experimental value will be greater than the molecular/formula

masses of the known salts because the moles determines from the experiment are undervalued.

E. Determine the theoretical mass of the precipitate (calcium carbonate) that would be

produced using the step E and F above. Show all work!

F. Calculate the percent yield and percent error using the theoretical value above.

G. Complete the diagram on the bottom of the second page that illustrates all compounds in

the solution before you filtered out the precipitate.

_______________________________________________________ jump to: top 10/19 – Monday’s Homework: –

1. Please view the Limiting Reagent Lecture (up to 22:00) that teaches the chart method of calculating the limiting reagent with The ICE Table. Complete side 1 ONLY with me. How could this method made last night’s homework easier?

I did this in class but if you need a review of the chart method in determining the limiting reagent and excess chemical then please go ahead and review.

Limiting reagent intro demo new worksheet.pdf

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2. Complete the backside of the Limiting reagent Practice Video demo new worksheet.pdf (questions 3 and 4 ONLY) that was homework (front side) from this weekend, using the video posted below. You could try these 2 questions on your own first and then view the video if you are feeling adventurous!

Limiting reagent intro demo new worksheet.pdf with the video posted below. Start the video at 16:26 as you are not held accountable to questions 1 and 2 yet. We will be using the concept of limiting reagent in different types of AP Multiple Choice Problems.

Back side (questions 3 and 4) of the following worksheet:

Limiting reagent intro demo new worksheet.pdf

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3. Please complete Stoichiometry 3 – ICE Table Molarity Salsa.pdf which is really the second problem the homework Last night (Stiochiometry 3 – Molarity limiting reagent.pdf). So please redo that limiting reagent problem using the ICE Table method and review with the key. Don’t be mad that this way is simpler!!!

*Remember that moles will be calculated through Molarity (M * V(in Liters) = moles.

Molarity ( mole / Liter ) X Volume (Liter) = mole

Stoichiometry 3 – ICE Table Molarity Salsa.pdf
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Stoichiometry 3 – ICE Table Molarity Salsa key BEST p.pdf
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4. Complete the Short Form from a Tall Teacher below: You have 3 submissions to this form. Use the ICE Chart!

Limiting Reagent Google Form – handout.pdf

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1 : Limiting Reagent Lecture – Teaches the nonchart method up to 22:31

2 : Limiting Reagent Practice Video – backside of the flaming tube demo

* This video will start on question 3 (questions 1 & 2 are NOT assigned)

4: Limiting Reagent Form – A short form

Loading…

___________________________________________________________ Jump to: Tuesday Homework / top 10/20 – Tuesday – A Day – 1AB

Main focus –

a) To Complete the Lab 10 – Precipitation analysis of an Unknown metal carbonate.

b) To practice Limiting reagent problems/concepts

Period 1:

1. Review of the Homework form – see the video posted below that reviews the form.

Limiting reagent Form Key.pdf View Download

2. Complete Lab 10 calculations: Theoretical amount of calcium carbonate, Percent Yield, and particulate diagrams of the ions and precipitate – (Page 2).

3. Stoichiometry solution/limiting reagent practice problems:

Stoichiometry 4 – Precipitation – limiting reagent .pdf
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Stoichiometry 4 – Precipitation – limiting reagent Key p.pdf
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Review of Limiting Reagent Form intro (in the first half of the video)

2nd part: Lab 8 introduction – A review of the basic premise of this precipitation analysis lab

_____________________________________________________ jump to: top 10/20 – Tuesday’s Homework: – Due Thursday!

* We may have done this step in class today

*1. Please complete – Stoichiometry 4 – Precipitation – limiting reagent .pdf side one with me with the video below and then complete the side 2 with the key or with second video.

Stoichiometry 4 – Precipitation – limiting reagent .pdf
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Stoichiometry 4 – Precipitation – limiting reagent Key p.pdf
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2. Please view the Lab 10 – review video below if you do not completely understand the lab 10 which will be helpful for the form tonught.

Lab 10 is NOT due tomorrow!!!

3. Complete the form based on Lab 10’s calculations. Today in class we completed the data and calculations for this lab. We determined the mass of the experimental precipitate AND the theoretical through the stoichiometry. This lab was a hands-on approach to precipitation analysis and precipitation reaction in general. Monday’s/Tuesday’s homework were based on the same concepts! IN the FORM BELOW WE ARE PRETENDING that we are doing the same lab and will follow the same steps as we did today/yesterday (with given values of mass of your unknown salt and filter paper). IF you need to please review these calculations with the video below.

Precipitation Analysis Lab Form hardcopy.pdf
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1 : Stoichiometry 4 – Precipitation – limiting reagent – side one tutorial.

1 : Stoichiometry 4 – Precipitation – limiting reagent – side 2 tutorial.

2 : Lab 10 review – This might help with your calculations and tonights form!

3 : Gravimetric Analysis Lab Form –

__________________________________________________________________ Jump to: Wednesday Homework / top 10/21 – Wednesday – B Day – 1,2B

Main focus –

a) To take the PSAT!

Period 2, 5:

1. To miss having AP Chemistry Class! 😢

_________________________________________________________ jump to: top 10/21 – Wednesday Homework: –

1. To recover from not going to AP Chemistry today.

2. Complete Tuesday’s homework.

_______________________________________________ Jump to: Thursday Homework /top 10/22 – Thursday – A Day – 1AB

Main focus –

a) Review Precipitation analysis

b) More Limiting Reagent Practice

Period 1:

1. Review the Gravimetric Analysis Lab Form

2. Another In class example to practice limiting reagent/precipitation.

Precipitation Analysis/Limiting Reagent worksheet.pdf
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Precipitation Analysis/Limiting Reagent Practice KEY.pdf
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3. Complete Lab 10

– Complete the 2nd page to solve the theoretical moles/mass of the precipitate AND the particulate diagram.

– Calculate the % Error for the mass of the precipitate produced.

– Calculate the % Yield for the mass of the precipitate produced

– Write the Conclusion and Hand in!

4. Start the Homework -Take home quiz

______________________________________________________ jump to: top 10/22 – Thursday Homework: –

1. Please start/complete the take-home quiz – due in class tomorrow. Hint:To complete this analysis you need to think how you completed Lab 8 – Precipitation analysis. I have re- posted the Lab 10 review vidoe yesterday that can help with your understanding of basic premise of precipitation analysis.

Stoichiometry 4a – Precipitation – limiting reagent – quiz.pdf
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2. Please complete Lab 10 with a conclusion. You may have completed this in class today!

3. You may want to review todays class work with the key or print out todays worksheet and then review with the key.

Precipitation Analysis/Limiting Reagent worksheet.pdf
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Precipitation Analysis/Limiting Reagent Practice KEY.pdf
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2 : Lab 10 review – This might help with your calculations with Precipitation analysis

________________________________________________________ Jump to: Friday Homework /top 10/23 – Friday – B Day – 1,2B

Main focus –

a) Celebrate “MOLE DAY!”. Its 10/23 today! Get it?

a) To Take a Stoichiometry quiz using a precipitating reaction.

b) To start a Lab 11 – Stoichiometry of Baking Soda and Washing Soda

Period 1,2:

1. Collect the Take-Home Quiz.

2. Review the relative amount of ions that remain using quantitative values from the ICE Table from yesterday’s classwork.

Precipitation Analysis/Limiting Reagent Practice KEY.pdf
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3. Take the (Surprise?) Stoichiometry Quiz.

4. Complete the completion reaction for Lab 11 for Monday – Maybe?

._________________________________________________ Lab 11 – 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 11 – Unknown carbonates Lab.pdf
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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)

_______________________________________________ jump to: top 10/23 – Friday’s Homework: –

*Test 2 is Tuesday & Wednesday next week. There is no Redox or Electrochemistry or Unit cell questions.

1. Please view the lecture below and complete the questions 1 and 2 (on the back) the limiting reagent intro demo new worksheet that was given out last week. It was Monday’s homework.

Limiting reagent intro demo new worksheet.pdf

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2. Please complete the Analytical Chemistry Test Review worksheet. pdf. Please try to complete it without looking at the key first. If you struggle fight through and try to complete it the best that you can AND then look to review.