Payment for Science Classes

Hi folks,

Just a reminder, that payment is due for the final session of classes. The cost is $250 for the full 2 hour class and $180 for the 1.5 hour class.

If you wish to mail your payments, my address is 3105 Whitfield Rd. Chapel Hill, NC 27514.

I hope everyone is enjoying this wonderful spring-like weather.

Jim Mueller

Chemistry Recording 2/21 : Limiting Reagents

Way to go, ScienceJim! Your video is now on YouTube.  Chem week 21 Want to spread the word about your newest video? Share your video We've sent this email to sciencejim-6785@pages.plusgoogle.com. You can unsubscribe from notifications for finished uploads by visiting Email Preferences. ©2014 YouTube, LLC 901 Cherry Ave, San Bruno, CA 94066

2/21 Chemistry Update and Homework due 2/28

Hi folks,

Today we took the next step in stoichiometry and got into limiting reagents. I've included a .pdf from Chemistry Workbook for Dummies that includes questions and answers for you to work with this week for homework. We also did a lab were we used the magic of Avagadro's number to determine the width of a molecule.

Homework due 2/28 is to:
Finish the lab if you didn't finish in class
Do problems 9-11 from the .pdf. (I'll send the answers in a separate email.)

Re: Chemistry class is cancelled

Well, disregard that last email than.

---

From: Jim Mueller <jim@bitesizephysics.com>
To: Martha Shevzov <kshevzov@yahoo.com>; Tanya Porter <tatianan3@gmail.com>; John Snouwaert <john_snouwaert@bellsouth.net>; Domino <zod10@bellsouth.net>; Samantha <samanthamarieallen@gmail.com>; Jack <graceland8888@gmail.com>; Trevin <Trevincraig@nc.rr.com>; sciencejim.chchem2013@blogger.com; Peter Newell <peter@ttsinc.net>; Karen <karen2004@h-acad.org>; Bryan Cox <bryanokc@gmail.com>; Trevincraig0@gmail.com; Ann Cox <annabanana233@gmail.com>; Martha <Rockit44@gmail.com>; Caleb Porter <zeratulman@aol.com>; Daniel <Shadowhawkdb@gmail.com>; Trevin Craig <ambercraig@nc.rr.com>
Sent: Thursday, February 13, 2014 8:50 PM
Subject: Chemistry class is cancelled

Hi folks,

Looks like a lot of folks are going to have to put skates on their cars in order to make it to class tomorrow.  With that in mind, it's probably easier to just cancel class.  :) 

Have a great Friday and I'll see you all next week.

Jim Mueller

Re: Class tomorrow?

Bev is attempting to get out of our neighborhood as I write this. Yesterday afternoon I got stuck three times while moving my minivan from the entrance of out neighborhood (where I was forced to leave it on Wednesday) to the foot of our driveway. Since then some of the clear spots have melted and refrozen to create black ice. However, if it warms up for a while, things may improve and make it easier to get out. 

I can email again after Bev reports back, assuming she makes it to work in Chapel Hill.

Jay

---

From: Jim Mueller <jim@bitesizephysics.com>
To: Martha Shevzov <kshevzov@yahoo.com>; Tanya Porter <tatianan3@gmail.com>; John Snouwaert <john_snouwaert@bellsouth.net>; Domino <zod10@bellsouth.net>; Samantha <samanthamarieallen@gmail.com>; Jack <graceland8888@gmail.com>; Trevin <Trevincraig@nc.rr.com>; sciencejim.chchem2013@blogger.com; Peter Newell <peter@ttsinc.net>; Karen <karen2004@h-acad.org>; Bryan Cox <bryanokc@gmail.com>; Trevincraig0@gmail.com; Ann Cox <annabanana233@gmail.com>; Martha <Rockit44@gmail.com>; Caleb Porter <zeratulman@aol.com>; Daniel <Shadowhawkdb@gmail.com>; Trevin Craig <ambercraig@nc.rr.com>
Sent: Thursday, February 13, 2014 5:05 PM
Subject: Class tomorrow?

Hi folks,

What is everyone's thoughts on class tomorrow?  I live quite close so I feel I can get there without too much of a problem.  However, what do you all think?  How will be roads be where you live and do you feel safe coming to and from Chapel Hill?

Let me know when you get a chance and if enough folks are able to make it, we will hold class tomorrow.

Hope everyone is safe and having fun in this snow!

Jim Mueller

Re: Class tomorrow?

Same for Caleb...

On Thu, Feb 13, 2014 at 6:30 PM, Karen <karen2004@h-acad.org> wrote:

We live in Pittsboro, and as of right now I'd be surprised if we can get out of our driveway tomorrow.  My husband tried to get out yesterday afternoon before it started icing and almost didn't make it.  So, unless it warms up enough to really start melting things (and it looks like it's not supposed to be above freezing until after 11am) I doubt we'll be able to make it.

Karen & Daniel  

On Thu, Feb 13, 2014 at 5:05 PM, Jim Mueller <jim@bitesizephysics.com> wrote:

Hi folks,

What is everyone's thoughts on class tomorrow?  I live quite close so I feel I can get there without too much of a problem.  However, what do you all think?  How will be roads be where you live and do you feel safe coming to and from Chapel Hill?

Let me know when you get a chance and if enough folks are able to make it, we will hold class tomorrow.

Hope everyone is safe and having fun in this snow!

Jim Mueller

Chemistry class is cancelled

Hi folks,

Looks like a lot of folks are going to have to put skates on their cars in order to make it to class tomorrow. With that in mind, it's probably easier to just cancel class. :)

Have a great Friday and I'll see you all next week.

Jim Mueller

Re: Class tomorrow?

We live in Pittsboro, and as of right now I'd be surprised if we can get out of our driveway tomorrow.  My husband tried to get out yesterday afternoon before it started icing and almost didn't make it.  So, unless it warms up enough to really start melting things (and it looks like it's not supposed to be above freezing until after 11am) I doubt we'll be able to make it.

Karen & Daniel  

On Thu, Feb 13, 2014 at 5:05 PM, Jim Mueller <jim@bitesizephysics.com> wrote:

Hi folks,

What is everyone's thoughts on class tomorrow?  I live quite close so I feel I can get there without too much of a problem.  However, what do you all think?  How will be roads be where you live and do you feel safe coming to and from Chapel Hill?

Let me know when you get a chance and if enough folks are able to make it, we will hold class tomorrow.

Hope everyone is safe and having fun in this snow!

Jim Mueller

Class tomorrow?

Hi folks,

What is everyone's thoughts on class tomorrow? I live quite close so I feel I can get there without too much of a problem. However, what do you all think? How will be roads be where you live and do you feel safe coming to and from Chapel Hill?

Let me know when you get a chance and if enough folks are able to make it, we will hold class tomorrow.

Hope everyone is safe and having fun in this snow!

Jim Mueller

Borax Moles Calculation

Hi Folks,

If you have already done the Borax mole calculation in class using the 10H2O that's fine. No need to redo that.

2/7 Chemistry update and homework due 2/14

Hi folks,

Today we took the time to do another lab. I had the students create silly putty using water, borax and glue. The point of the experiment was to carefully measure the masses of the three different substances and determine the ideal ratios of the materials needed to create just the right amount of silly putty with nothing left over.

Homework for this week is to:

1. Figure out (if you haven't already in class) how much water, borax and glue you would need to create 1000g of silly putty with nothing left over.

2. Using the masses you found in class, calculate how many moles of materials you used to create your "perfect" silly putty. The formulas for Borax and glue are on the sheets you received in class. Borax has a very strange formula with a 10H2O thing tacked to it. That's what happens when it combines with water. Just ignore the 10 H2O to find the # of moles of solid Borax.

Read pp. 271 - 279 in the Conceptual Chemistry book.
Do exercises pg. 303 #'s 1 - 9
Do problems pg. 304 #'s 1-4

1/31 Chem recording more stoichiometry

http://www.youtube.com/watch?v=bBurtfvtX3M

Jan. 31 Chemistry update and homework due Feb. 7

Hi folks,

I'm sorry it took some time for me to get this out to you.  I wanted to take the time to grade your quizzes so that I could see where folks are.

We worked more with moles and stoichiometry today.  This has proven to be a difficult topic so we're continuing to work with it.  To try to make the concept a bit more concrete, I had the students use moles to count the number of molecules in a jar of air, a jar of salt and a jar of sugar.  

For homework this week, do the following questions.  The answers are included at the bottom.  PLEASE take the time to check your answers and make sure you understand how to get these right.   These are the kinds of questions that will keep coming up in quiz after quiz.  It behooves you to master this material.  :)

1.  Balance these reactions and tell me what kinds of reactions they are.

a.  C₆H₁₂O₆(s) +   O₂ (g)  -->   CO₂(g) +   H₂O

b.  H₂ (g) +   O₂ (g)   -->    H₂O (l)

c.  NaCl (s) +   AgNO₃ (aq) -->    AgCl (s) +   NaNO₃ (aq)

d.  HBr (l)  +    Ca(OH)2 (s)  -->    H₂O  +   CaBr₂ (aq)

e.  NaHPO₄ (s)  -->   Na (s)   +  H₂  +  P   +  O₂

2. Which atom in the following pairs would be more electronegative?

a.  V & Ge    b. Li & Rb  c.  Pb & Re

3. Which atom in the following pairs would be have larger radius?

a. Be & Sr   b. Hg & Ta  c.  Zn & Kr

4. Name the following polyatomic ions.

a. HSO3-

b. HCO3-

c. OH-

5.  Give the formula for the following polyatomic ions. (Don't forget the charges.)

a. Sulfate

b. Carbonate

c. Ammonium

6.  Write the formulas for the following compounds.  Give their molar mass as well.

a. Sodium Phosphide

b.  Ammonium Sulfate

c. Iron (III) oxide

d.  Copper (I) Carbonate

e. Cr(NO2)3

f.  Silicon difluoride

g. Diphosphorous trichloride

7.  Name the following compounds

a. NH4OH

b. Be2SO4

c. N2H4

d. CBr4

8. Draw Cr(NO2)3

9.  N2O3  +  H2O   -->  HNO2

a.  Balance the equation.

b.  At STP how many liter of dinitrogen trioxide react to produce 36.98g of nitrous acid?

c.  How many molecules of water react with 17.3 L of dinitrogen trioxide (at STP)?

10.  How many atoms of K₂CrO₄ are there in .87 moles of the compound?

11.  If you have 96 liters of CO₂, how many grams do you have?

12.  If you have 23 x 10²³ atoms of NaCl how many grams do you have?

1. a.  C₆H₁₂O₆(s) +  6O₂ (g)  -->  6CO₂(g) +  6H₂O

b.  2H₂ (g) +   O₂ (g)   -->    2H₂O (l)

c.  2HBr (l)  +    Ca(OH)2 (s)  -->    2H₂O  +   CaBr₂ (aq)

2. Which atom in the following pairs would be more electronegative?  Answers in bold.

a.  V & Ge    b. Li & Rb  c.  Pb & Re

3. Which atom in the following pairs would be have larger radius?

a. Be & Sr   b. Hg & Ta  c.  Zn & Kr

4. Name the following polyatomic ions.

a. HSO3-  Hydrogen Sulfite

b. HCO3- Hydrogen Carbonate

c. OH- Hydroxide 

5.  Give the formula for the following polyatomic ions. (Don't forget the charges.)

a. Sulfate 

SO42-

b. Carbonate 

CO32-

c. Ammonium

 

NH4+

6.  Write the formulas for the following compounds.  Give their molar mass as well.

a. Sodium Phosphide Na3P

b.  Ammonium Sulfate  (NH4)2(SO4)

c. Iron (III) oxide  Fe2O3

d.  Copper (I) Carbonate Cu2(CO3)

e.  Silicon difluoride  SiF2

f. Diphosphorous trichloride  P2Cl3

7.  Name the following compounds

a. NH4OH  Ammonium Hydroxide

b. Be2SO4  Beryllium Sulfate 

c. N2H4 Dinitrogen Tetrahydride

d. CBr4 Carbon Tetrabromide

8.  N2O3  +  H2O   -->  HNO2

a.  Balance the equation.  

 N2O3  +  H2O   -->  2HNO2

b.  At STP how many liter of dinitrogen trioxide react to produce 36.98g of nitrous acid?

9l

c.  How many molecules of water react with 17.3 L of dinitrogen trioxide (at STP)?

4.65 x 10^23

10.  How many atoms of K₂CrO₄ are there in .87 moles of the compound?

5.24x10^23

11.  If you have 96 liters of CO₂, how many grams do you have?

189.2g