From: Carrie Maslow (cmaslow@lwhs.org)
Date: Thu May 12 2005 - 14:12:02 PDT
Message-Id: <7C77EBE9-C32A-11D9-BAB3-003065EE0BEE@lwhs.org> From: Carrie Maslow <cmaslow@lwhs.org> Subject: Re: Pinhole Digest #1751 - 05/12/05 Date: Thu, 12 May 2005 14:12:02 -0700
Question about cow eye's
Hello, I am wanting to do cow eye dissections and am wondering if
there is any other source of cow eyes than Smith Meats. I was unable
to place my order before 11 this past Monday so I can't get eyes until
the 23rd which is too late. Let me know if you know another source.
carrie maslow
On May 12, 2005, at 12:20 AM, Pinhole Listserv wrote:
> Pinhole Digest #1751 - Thursday, May 12, 2005
>
> boiling pt elevation
> by "Geoff Ruth" <gruth@leadershiphigh.org>
>
>
> ----------------------------------------------------------------------
>
> Subject: boiling pt elevation
> From: "Geoff Ruth" <gruth@leadershiphigh.org>
> Date: Wed, 11 May 2005 07:08:08 -0700
>
> Lucila,
>
> I do a lab related to freezing pt depression that focuses on boiling
> point elevation. I actually do this with my AP chem class, but it
> could be modified for some first year chem classes (it's one of the
> easiest AP labs.)
>
> I ask students to find out the temperature at which the coolant in my
> car's radiator will freeze at.
> (I don't use the actual coolant, but rather a simulation (with green
> food coloring) since ethylene glycol is toxic.) In AP, I then have
> them think of a procedure they could use to figure out its freezing
> point. For a first year chem class, you could guide them towards
> realizing that if they measure the boiling point elevation of the
> solution, then they can calculate the solution's molality, and then
> use that to figure out the freezing point depression of water. By
> doing this, they connect boiling pt elevation with freezing pt
> depression.
>
> Or if this is too complex (it would be for my 1st year chem kids),
> you could do a more qualitative lab by giving them solutions with
> differing amounts of solute dissolved in the same solvent, and then
> having them find the bp of each solution. By comparing, they should
> be able to see that the more solute, the higher the bp. Here in the
> bay area, you might relate it to evaporating water from a salt pond
> and how the time to evaporate the next x mL of water increases as the
> pond becomes increasingly salty.
>
> I used to hate teaching colligative properties, but I now think
> they're cool because there are a lot of easy-to-see and
> easy-to-experience real-world consequences.
>
> - Geoff
>
>> Algis,
>> I am planning to make ziploc icecream with my students.
>> Do you have activities or the theory about colligiative, properties-
>> freezing point depression for this lesson?
>> I am sure we'll enjoy Ziploc icecream in our class.
>> Thanks for sharing!
>>
>> Algis Sodonis
>>
>> The Urban School of SF
>>
>> -----Original Message-----
>> From: pinhole@exploratorium.edu [mailto:pinhole@exploratorium.edu]
>> Sent: Tuesday, May 10, 2005 12:20 AM
>> To: Pinhole Listserv
>> Subject: Pinhole Digest #1749 - 05/10/05
>>
>> Pinhole Digest #1749 - Tuesday, May 10, 2005
>>
>> Fuel Cell Gadget...
>> by <SFPhysics@aol.com>
>> Re: fun chem labs
>> by "Marc Kossover" <zeke_kossover@yahoo.com>
>> Anybody teaching bridge engineering?
>> by "Exploratorium Learning Studio"
>> <studio@exploratorium.edu>
>> Re: pinhole fun chem labs
>> by "Algis Sodonis" <asodonis@urbanschool.org>
>>
>>
>> ----------------------------------------------------------------------
>>
>> Subject: Fuel Cell Gadget...
>> From: <SFPhysics@aol.com>
>> Date: Mon, 9 May 2005 05:36:28 EDT
>>
>>
>> -------------------------------1115631387
>> Content-Type: text/plain; charset="US-ASCII"
>> Content-Transfer-Encoding: 7bit
>>
>> Greeting Geoff:
>>
>> The classic fuel cell uses Hydrogen gas and Oxygen gas on each side
>> of a
>> membrane catalyst to obtain power when the two gases combine to make
>> water.
>> The
>> energy comes from the chemical bonding. The water "fuel cell" being
>> sold
>> is
>> nothing more than a dry zinc/copper cell that activates when water
>> is added
>>
>> to make the electrolyte solution in the ammonium chloride blotter
>> paper
>> separator. After several refills of water the clock dies because
>> one of
>> the
>> electrodes or the electrolyte is used up. There are variations of
>> this
>> chemical
>> voltaic cell and every one claims you get free energy from water.
>> Since
>> water
>> has no more chemical energy to give up, it is not the source of
>> power for
>> these novelty items but they make you think you are getting
>> something for
>> nothing. Chalk up another one for marketing triumphing over the
>> laws of
>> science.
>>
>> Al Sefl
>> Who is hard at work on a zero point energy source...
>> And once he gets it he'll use his Tesla transmitter to send free power
>> around the world...
>>
>> Now if only he could get beyond the zero point on his checking
>> account...
>>
>>
>> -------------------------------1115631387
>> Content-Type: text/html; charset="US-ASCII"
>> Content-Transfer-Encoding: quoted-printable
>>
>> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
>> <HTML><HEAD>
>> <META http-equiv=3DContent-Type content=3D"text/html;
>> charset=3DUS-ASCII">
>> <META content=3D"MSHTML 6.00.2800.1106" name=3DGENERATOR></HEAD>
>> <BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000;
>> FONT-FAMILY:=20=
>> Arial"=20
>> bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT
>> id=3Drol=
>> e_document=20
>> face=3DArial color=3D#000000 size=3D2><FONT id=3Drole_document
>> face=3DArial=20=
>> color=3D#000000=20
>> size=3D2><FONT id=3Drole_document face=3DArial color=3D#000000
>> size=3D2>
>> <DIV>Greeting Geoff:</DIV>
>> <DIV> </DIV>
>> <DIV>The classic fuel cell uses Hydrogen gas and Oxygen gas on each
>> side
>> of=20=
>> a=20
>> membrane catalyst to obtain power when the two gases combine to
>> make=20
>> water. The energy comes from the chemical bonding. The
>> water
>> "fu=
>> el=20
>> cell" being sold is nothing more than a dry zinc/copper cell that
>> activ=
>> ates=20
>> when water is added to make the electrolyte solution in the ammonium
>> chlorid=
>> e=20
>> blotter paper separator. After several refills of water the
>> clock
>> dies=
>> =20
>> because one of the electrodes or the electrolyte is used
>> up.
>> Ther=
>> e=20
>> are variations of this chemical voltaic cell and every one claims you
>> get
>> fr=
>> ee=20
>> energy from water. Since water has no more chemical energy to
>> give
>> up,=
>> it=20
>> is not the source of power for these novelty items but they make you
>> think
>> y=
>> ou=20
>> are getting something for nothing. Chalk up another one for
>> marketing=20
>> triumphing over the laws of science.</DIV>
>> <DIV> </DIV>
>> <DIV>Al Sefl</DIV>
>> <DIV>Who is hard at work on a zero point energy source...</DIV>
>> <DIV>And once he gets it he'll use his Tesla transmitter to send free
>> power=20
>> around the world...</DIV>
>> <DIV> </DIV>
>> <DIV>Now if only he could get beyond the zero point on his checking=20
>> account...</DIV>
>> <DIV> </DIV></FONT></FONT></FONT></BODY></HTML>
>>
>> -------------------------------1115631387--
>>
>> ----------------------------------------------------------------------
>>
>> Subject: Re: fun chem labs
>> From: "Marc Kossover" <zeke_kossover@yahoo.com>
>> Date: Mon, 9 May 2005 07:23:11 -0700 (PDT)
>>
>> From: Marc Crown <mcrown@gatewayhigh.org>
>> Subject: fun chem labs
>> Date: Sun, 8 May 2005 14:20:39 -0700
>>
>>
>>> something that will send em off with a desire to
>> take
>>> more chemistry.
>>
>> Do you have hot plates and some clean labwear or pots
>> and pans of your own? If so, the chemistry of cooking
>> can be a blast. I've taught this off and on to adults
>> and children for years.
>>
>> The way to make this scientific, though, is to give
>> different recipes to the different groups in class and
>> have them compare the results after they are done.
>> That way they can see what's happening.
>>
>> You might want to start with simple candies. You can,
>> for example, add water to granulated sugar (sucrose)
>> to make syrup and then evaporate the water back out
>> again to make sugar (sucrose) crystals. If you add a
>> 10 mL of corn syrup (nearly pure fructose) to a 250 mL
>> of sucrose, it will never re-crystallize; however, and
>> brown into carmel. Why? The fructose is not the same
>> shape as sucrose and interfers with crystal formation.
>> That means that the water keeps evaporating until the
>> solution gets so hot that the sucrose starts to brown.
>>
>> Serve over ice cream, which as another person has
>> pointed out has several bits of useful chemistry
>> involved. Not just freezing point depression necessary
>> to freeze the water, but kneading and aerating the
>> mixture to keep the crystals small the product less
>> dense.
>>
>> Making fudge falls into the same crystallization
>> problem. Fudge is primarily sugar and fat with a bit
>> of chocolate (or other) flavoring. You want many small
>> sugar crystals to make the candy soft and creamy
>> feeling. Once everything is melted and combined, you
>> want to cool it gentle at first so that many crystals
>> are formed, then you want to beat it hard to keep the
>> crystals from growing. Fudge made with marshmallow
>> cream works because it includes fructose in the
>> marshmallow cream and stabilizers (like gelatin) to
>> hold the fudge together even without good crystals.
>>
>> If you'd like more ideas, even ones that aren't candy,
>> just drop me a line.
>>
>> Resources:
>>
>> Cookwise: The Hows and Whys of Successful Cooking by
>> Shirley O. Corriher
>>
>> On Food and Cooking: The Science and Lore of the
>> Kitchen by Harold McGee
>>
>> <http://www.exploratorium.edu/cooking/index.html>
>>
>> Marc "Zeke" Kossover
>> The Jewish Community High School of the Bay
>> San Francisco, CA 94121
>> <http://tochnit.jchsofthebay.org/~zkossover>
>>
>> __________________________________________________
>> Do You Yahoo!?
>> Tired of spam? Yahoo! Mail has the best spam protection around
>> http://mail.yahoo.com
>>
>> ----------------------------------------------------------------------
>>
>> Subject: Anybody teaching bridge engineering?
>> From: "Exploratorium Learning Studio" <studio@exploratorium.edu>
>> Date: Mon, 9 May 2005 15:54:24 -0700 (PDT)
>>
>>
>> Two good articles in the latest batch of magazines. Technology
>> Teacher's
>> cover story is a feature on "teaching elements and principles of
>> bridge
>> design" (unfortunately, with no identification of the bridge in the
>> photo). And American Scientist has a fine historical article on the
>> Joshua A. Norton (a/k/a "Bay") Bridge, including the controversy and
>> science of the alternative designs. (Bonus: cover story is on the
>> physics
>> of pitching fastballs.)
>>
>> We have books, yes, but don't forget the magazines.
>>
>>
>> Jo Falcon, MLIS
>>
>> ===============================================================
>> Exploratorium Learning Studio
>> 3601 Lyon Street
>> San Francisco, CA 94123
>> (Phone) 415-561-0343
>> (Fax) 415-561-0370
>> (Email) studio@exploratorium.edu
>> (URL) http://www.exploratorium.edu/ls
>> ===============================================================
>>
>> ----------------------------------------------------------------------
>>
>> Subject: Re: pinhole fun chem labs
>> From: "Algis Sodonis" <asodonis@urbanschool.org>
>> Date: Mon, 09 May 2005 20:13:54 -0700
>>
>> This is a multi-part message in MIME format.
>>
>> ----=_--00867969.0086790e.bea5d772
>> Content-Type: text/plain; charset=ISO-8859-1
>> Content-Transfer-Encoding: 8bit
>>
>> A real winner is making ziploc icecream
>>
>> this is a lesson on colligiative properties- freezing point
>> depression.
>>
>> In a large ziploc bag, mix ice and salt (ordinary table salt works
>> well,
>> since it dissolves quickly)
>>
>> In another smaller ziploc bag, about 1 cup milk, 1 teaspooon coffee
>> creamer
>> a few teaspoons sugar and some vanilla extract to taste
>> additional stir-ins can be optional.
>>
>> place the smaller sealed bag into the larger one with ice/salt
>> mixture and
>> seal the larger bag. Start mixing everything (gloves can be helpful
>> here).
>> Within about 15-20 minutes, this will start to harden. It tastes
>> surprisingly good.
>>
>> Algis Sodonis
>>
>> The Urban School of SF
>>
>>
>> "Pinhole Listserv" <pinhole@exploratorium.edu> on Sunday, May 8, 2005
>> at
>> 2:20 PM -0800 wrote:
>>> I left myself a week at the end of the quarter to do some "just for
>>> fun" labs in my chemistry class. I was thinking along the lines of
>>> some
>>> polymer stuff but haven't come across anything that appealing. does
>>> anyone have any good suggestions that they've done in the past?
>>> Doesn't have to be polymer, can be from any unit/ any experiment or
>>> demo, but something that will send em off with a desire to take more
>>> chemistry.
>>>
>>> I've never had "free" time before.
>>> thanks
>>> marc
>>>
>>>
>>> ---------------------------------------------------------------------
>>> ------
>>>
>>> To unsubscribe from pinhole, send an email to
>>> requests@exploratorium.edu
>>> with the words 'unsubscribe pinhole' (without the quotes) in the
>>> SUBJECT
>>> of the email.
>>>
>>> To subscribe to the digest and only get 1 combined message a day,
>>> send an
>>> email to requests@exploratorium.edu with the words 'subscribe digest
>>> pinhole' (without the quotes) in the SUBJECT of the email.
>>>
>>> Check out what your colleagues have written on Pinhole in the Pinhole
>>> archives at: http://saturn.exploratorium.edu/ti/alumni/pinhole.html
>>> ---------------------------------------------------------------------
>>> ------
>>>
>>>
>>
>>
>>
>> ----=_--00867969.0086790e.bea5d772
>> Content-Type: text/html; charset=ISO-8859-1
>> Content-Transfer-Encoding: quoted-printable
>>
>> <=21DOCTYPE HTML PUBLIC =22-//W3C//DTD HTML 4.0 Transitional//EN=22>
>> <html><head><meta http-equiv=3D=22Content-Type=22
>> content=3D=22text/html; c=
>> harset=3DISO-8859-1=22>
>> <style
>> type=3D=22text/css=22>body=7Bmargin-left:10px;margin-right:10px;marg=
>> in-top:0px;margin-bottom:0px;=7D</style>
>> </head>
>> <body marginleft=3D=2210=22 marginright=3D=2210=22
>> margintop=3D=220=22 marg=
>> inbottom=3D=220=22>
>> <font face=3D=22Geneva=22 size=3D=22+0=22 color=3D=22=23000000=22
>> style=3D=
>> =22font-family:Geneva;font-size:10pt;color:=23000000;=22>A real
>> winner is m=
>> aking ziploc icecream <br>
>> <br>
>> this is a lesson on colligiative properties- freezing point
>> depression.<br>
>> <br>
>> In a large ziploc bag, mix ice and salt (ordinary table salt works
>> well, si=
>> nce it dissolves quickly)<br>
>> <br>
>> In another smaller ziploc bag, about 1 cup milk, 1 teaspooon coffee
>> creamer=
>> a few teaspoons sugar and some vanilla extract to taste<br>
>> additional stir-ins can be optional. <br>
>> <br>
>> place the smaller sealed bag into the larger one with ice/salt
>> mixture and =
>> seal the larger bag. Start mixing everything (gloves can be
>> helpful h=
>> ere). Within about 15-20 minutes, this will start to harden.
>> It=
>> tastes surprisingly good.<br>
>> <br>
>> Algis Sodonis<br>
>> <br>
>> The Urban School of SF<br>
>> <br>
>> <br>
>> <b>"Pinhole Listserv" <<a
>> href=3D=22mailto:pinhole=40explorato=
>> rium.edu=22>pinhole=40exploratorium.edu</a>> on Sunday, May 8,
>> 2005 at 2=
>> :20 PM -0800 wrote:<br>
>> </b></font><span style=3D=22background-color:=23d0d0d0=22><font
>> face=3D=22G=
>> eneva=22 size=3D=22+0=22 color=3D=22=23000000=22
>> style=3D=22font-family:Gen=
>> eva;font-size:12pt;color:=23000000;=22>I left myself a week at the
>> end of t=
>> he quarter to do some "just for <br>
>> fun" labs in my chemistry class. I was thinking along the lines
>> of som=
>> e <br>
>> polymer stuff but haven't come across anything that appealing. does
>> <br>
>> anyone have any good suggestions that they've done in the past?
>> <br>
>> Doesn't have to be polymer, can be from any unit/ any experiment or
>> <br>
>> demo, but something that will send em off with a desire to take more
>> <br>
>> chemistry.<br>
>> <br>
>> I've never had "free" time before.<br>
>> thanks<br>
>> marc<br>
>> <br>
>> <br>
>> ----------------------------------------------------------------------
>> -----=
>> <br>
>> <br>
>> To unsubscribe from pinhole, send an email to <a
>> href=3D=22mailto:requests=
>> =40exploratorium.edu=22>requests=40exploratorium.edu</a><br>
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>> r>
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