14197 flinnfax 2012-4 chemistry flr

Vol. 12-4 Chemistry Edition © 2012 Flinn Scientific, Inc.

Combustion of AcetyleneReaction of Calcium Carbide with Water

Continued on page 2

IntroductionUse this demonstration at the start of the school year or in your unit on chemical reactions. The safe, controlled explosion gives you the opportunity to answer “Yes” to a question that chemistry students often ask, “Are we going to blow something up today?”

Concepts•Combustion•Exothermicreaction

Safety PrecautionsCalciumcarbideiscorrosivetoeyesandskin. The solid must be kept dry since exposure to water or moisture gener-atesflammableacetylenegas.Carryoutthis demonstration on the scale provided and in a well-ventilated lab. Avoid con-tact of chemicals with eyes and skin and follow all laboratory safety guidelines. Wear chemical splash goggles, chemical- resistant gloves, and a chemical-resistant apron. A safety shield is recommended. Please review current Material Safety Data Sheets for additional safety, han-dling, and disposal information.

Procedure 1. Fill a 250-mL filter flask with tap wa -

t er to a depth of approximately 2 cm. 2. Using forceps, add about three

pieces of calcium carbide to the water and quickly place the cork on the flask. Immediately (within a few seconds) bring a lit match to the sidearm. A small explosion occurs, blowing the cork off the flask.

3. Add three more pieces of calcium carbide to the flask, and again place the cork on the flask.

Continued on page 4

What’s InsideCombustionofAcetylene . . . . . 1, 4

RevisedOSHARulesComing . . 1–2

“TheElements”TeachingTools . . 3

TeachingChemistry Video Series. . . . . . . . . . . . . . . . . . 3

EmergingLine . . . . . . . . . . . . . . . . 5

Product Spotlight. . . . . . . . . . . . 6–7

Flinn Fax Bulletin Board. . . . . . . . 8

fication of chemical hazards. (GHS has been in use internationally since 2002.) The goal of the updated OSHA stan-dard is to eliminate possible confusion about the risk associated with chemical hazards and thus provide better pro-tection for employees and emergency responders. By improving the under-standing of the nature of chemical hazards, and requiring specific safety training, the GHS standard seeks to transform the “Right to Know” law into the “Right to Understand.”

Focus on Three AreasFlinn Scientific has begun laying the groundwork necessary to implement the new standard by focusing on three

Some things are the same worldwide—a liter is the same volume, a meter is the same length, etc. However, the infor-mation provided on a chemical label or Material Safety Data Sheet (MSDS) may be different from one chemical manufac-turer to another. For example, a chemi-cal might be described as slightly toxic on one label but toxic on another. For improved safety there will soon be greater consistency in how chemical hazard information is communicated.

In March 2012 the Occupational Safe-ty and Health Administration (OSHA) revised the Hazard CommunicationStandard to align it with the United Nations Globally Harmonized System (GHS) for the classification and identi-

Revised OSHA Rules ComingLearn the Details from Flinn Scientific

MaterialsCalciumcarbide,CaC2, 2.5 g

Water, tap

Corkstofitflask,2

Filter flask, 250-mL

Forceps or spatula

Matches

Safety shield

14197_FlinnFax_2012-4_Chemistry.indd 1 8/23/12 3:05 PM

Vol. 12-4 Chemistry Edition

22

main areas: teacher and staff training, chemical labels, and Safety Data Sheets. (Under the GHS standard, MSDS will now be known simply as Safety Data Sheets, or SDS.) Flinn will update our chemical labels and SDS and provide professional development training for teachers and laboratory staff.

Compliance SchedulePassage of the GHS standard in March 2012 started a three-year “clock” or schedule for employers and chemical manufacturers to comply with the new requirements. The first deadline, Decem-ber 2013, is for employers. Your employer (your school or school district) must pro-vide training for teachers and staff to help you recognize and understand the new elements of the GHS labels and SDS.

There is a common misconception about this deadline. Chemical labelsand SDS are NOT required to meet the new format by December 2013. This deadline is for training, to ensure that employees (teachers and school staff) recognize and understand the new hazard classifications in case some chemicals they receive have GHS- formatted labels and SDS.

The deadline for manufacturers and chemical distributors (such as Flinn Scientific) to reclassify their chemicals and produce GHS-formatted labels and SDS for new products is June 2015.

In advance of this deadline, Flinn plans to gradually phase in both the label and SDS changes. You may begin to see the new labels on some Flinn chemicals in late 2012.

Revised OSHA Rules Coming—Continued from page 1

Teacher TrainingBeginning this fall, Flinn Scientific will provide free written and online video training resources regarding the new GHS requirements. These resources will be designed to help schools meet the December 2013 deadline to provide training for teachers and staff members in accordance with the revised OSHA HazCom and Laboratory Standard. To receive free training updates and notification of the latest posting of train-ing resources, please sign up to receive e-mails from Flinn Scientific by going to our website at www.flinnsci.com and clicking on “Monthly Emails.” Note: You do not need to sign up if you already receive e-mails from Flinn Scientific.

Flinn will help you meet the December 2013

training deadline.

Labels and Safety Data SheetsFlinn Scientific chemical labels will be redesigned to comply with the new standard. GHS establishes quantitative, objective criteria for classifying the relative hazards (flammability, toxic-ity, etc.) of chemicals. A standard set of pictograms, hazard statements, and signal words will be used to identify and further describe each hazard on the label. The appropriate label elements are selected from a total of eight picto-grams—symbols within a red diamond border—and 89 individual or combined hazardstatements.Examplesofhazard

statements include “highly flammable liquid and vapor” and “harmful in contact with skin.” In addition to these elements, GHS labels and SDS will include a signal word, if needed, and various precautionary statements. The signal word may be either “warning” for less hazardous materials or “danger” for materials that are more hazardous.

The pictograms, hazard statements, and precautionary statements will be incorporated into the new SDS as well. The GHS format for Safety Data Sheets is very similar to the American Nation-al Standards Institute (ANSI) format, which Flinn already follows, so the transition will be fairly straightforward. Most of the new information regarding hazard class and level is already pres-entonourcurrentMSDS.CurrentlyallFlinn Scientific MSDS can be accessed via the Safety Resources page on our website, www.flinnsci.com. We will continue this practice with the new SDS as well. In addition, we will post more information about both GHS labels and SDS on our website in the future as part of our training for teachers.

“Your Safer Source”Flinn Scientific is “Your Safer Source for Science Supplies.” This motto is our promise to always provide safe, quality products and the most reliable and up-to-date information to help you improve safety in your school. You can count on Flinn to help you comply with the new GHS standard. Thank you for your continued loyal support of the vision and values of Flinn Scientific.

Flinn Scientific Laboratory Safety CourseFree Online Videos at flinnsci.comFlinn’s highly regarded safety training is available to all science teachers absolutely free online! The critical safety information every science teacher needs to know is covered in the new Flinn Scientific Laboratory Safety Course.

Discover how Flinn’s safety training will give you the confidence and knowledge to effectively improve laboratory safety:

•ComprehensiveSafetyTraining—10MajorTopics,45Videos

•MaximumConvenience—AvailableOnline24/7

•GetFlinnCertifiedinSafety

•FreeProfessionalDevelopmentCreditOpportunities

•NoFees!It’sAllAbsolutelyFree!

Additional free videos covering laboratory design, safety and the law, and cleaning your chemical storage area are also available.

Visit flinnsci.com

Start Your Free Safety Training Today!Larry Flinn, Chairman of Flinn Scientific, in a video from the Flinn Scientific Laboratory Safety Course.


“The Elements” Teaching ToolsPeriodic Table, Book, and Cards Feature Stunning Photos

Flinn Scientific “Your Safer Source” 1-800-452-1261 flinnsci.com

3

Bring the elements to life with unique, colorful, and informa-tive periodic table poster, book, and card set. Featuring vibrant photographs created from the author’s collection of nearly 2,300 element samples, these products will make a great addition to the classroom and your curriculum.Flinn Scientific’s The Elements Periodic TableQuite possibly the most beautiful periodic table in the world! Size 39¼ʺ × 195⁄8ʺ. Printed on heavy, laminated gloss stock.The Elements BookEmbarkona fascinating journey through theperiodic tablewith this “visual exploration of every known atom in the universe.” 240 pages, 10¼ʺ × 10¼ʺ, hard cover.The Elements Card Deck—New!Beautiful photographs combined with vital information create versatile and engaging learning tools. You can arrange the cards to make a 7ʹ periodic table. 125 cards, 5ʺ × 5ʺ.Learnmoreabouteach“TheElements”productbyenteringthecatalognumberinthe“CatalogNo.orKeyword”searchbox at flinnsci.com.

Catalog No. Description Price/Each

AP7156 Flinn Scientific’s The Elements Periodic Table $32.00AP7455 The Elements Book 29.95AP7540 The Elements Card Deck 24.95

AP7156

AP7540

AP7455

Teaching Chemistry Video SeriesLearn “Best Practices” from Award-Winning Teachers

Improve Your Chemistry Teaching SkillsView and learn THE BEST chemistry demonstrations, experimentsand lab activities—all documented with extensive lab hints, teaching tips, and instructional techniques.Experienced, award-winning highschool chemistry teachers model their unique teaching styles and dis-cuss strategies proven to help students learn and succeed in chemistry.

View Sample Videos—FREE!Go to www.flinnsci.com and click on Teaching Chemistry Video Series

Flinn’sTeachingChemistryVideoSeriesoftestedlabactivities is also available on DVD! Start building your video library today!


AP7485 Introduction to Chemistry DVD Set $129.95AP7486 Teaching Chemistry as an Experimental Science DVD Set 129.95

AP7487 Atoms, Molecules and Ions DVD Set 129.95

AP7488 Chemical Reactions and Stoichiometry DVD Set 129.95

AP7489 Chemistry of Gases DVD Set 129.95

AP7490 Energy and Thermodynamics DVD Set 129.95

AP7491 Solids and Liquids DVD Set 129.95

AP7492 Advanced Concepts in Chemical Reactions DVD Set 129.95

AP7493 Electron Transfer in Chemistry DVD Set 129.95

AP7494 Applications of Chemistry DVD Set 129.95

AP7495 Teaching Chemistry Video Series Complete DVD Set 999.00



4

Knock Your Socks OffSafe and Reusable Carbide Cannon

4. Wait several seconds before bringing the lit match to the side arm. Instead of an explosion, a small flame burns steadily at the side arm.

5. Immediately squelch the reaction by bringing a wet paper towel to the side arm to extinguish the flame. Then pour out the water, and check for any remaining calcium carbide.

DisposalPlease consult your current Flinn Scien-tific Catalog/Reference Manual for gen-eral guidelines and specific procedures, and review all federal, state and local regulations that may apply, before pro-ceeding. After calcium carbide has re-acted with the water, a basic solution is produced. Neutralize the solution with 3 M hydrochloric acid and check with pH paper according to Flinn Suggested Disposal Method #24b. Decant the neu-tral solution and rinse it down the drain with at least a 20-fold excess of water. Make sure there is no unreacted calci-um carbide in the mixture.

DiscussionCalcium carbide, CaC2, is primarily used as a source of acetylene gas, which is produced by reacting calcium carbide with water. This reaction was utilized in original carbide (miners’) lamps—wa-

ter was slowly dripped on the carbide producing acetylene gas, which was then ignited. These lamps were com-monly used in slate, copper and tin mines. Since acetylene gas is highly flammable, the carbide lamps were not used in coal mines, where they would be a serious hazard. Most carbide lamps have been replaced today by electric LEDlamps.Acetylene, H—C C—H, consists

of two hydrogen atoms and two carbon atoms joined by a triple bond. Acetylene is often found as the fuel in torches—it burns brilliantly in air with a very hot flame due to its very high heat of com-bustion(1300kJ/mole).

The reaction of calcium carbide and water produces acetylene and a chalky suspension of calcium hydroxide.

CaC2(s) + 2H2O(l) → C2H2(g) + Ca(OH)2(aq) Equation 1

When a lit match is brought up to the side arm of the flask, the combustion of the acetylene occurs inside the flask. The resulting rapid expansion of the gaseous products followed by air rush-ing into the flask causes a controlled explosion.

2C2H2(g) + 5O2(g) →4CO2(g) + 2H2O(g) Equation 2

When a lit match is brought to the

Combustion of Acetylene—Continued from page 1

sidearm of the flask after several sec-onds, the combustion of the acetylene takes place outside the flask due to the lack of available oxygen in the flask.

Flinn Scientific Teaching Chemistry Video SeriesA video of the Combustion of Acetylene activity, presented by Kathleen Dom-brink, is available in Reactions of Calci-um Carbide—Combustion of Acetylene, part of the Flinn Scientific Teaching ChemistryVideoSeries.

Materials for Combustion of Acetylene are available from Flinn Scientific


C0346 Calcium Carbide, 100 g $ 8.90GP4072 Filtering Flask, 250-mL 17.10AP8314 Cork, Size 14, Pkg/100 36.70AB1018 Forceps, Polypropylene .80

Use this simple, safe, and exciting “carbide can non” to demonstrate the reac-tion of calcium chloride with water. Fill the base of the apparatus with a few grains of calcium carbide and add water to produce flammable acetylene gas. Wait a minute, and ignite. The projectile, a soft sock, will be propelled across the room, to the amaze-ment of your students!CarbidecannonisconstructedofdurablePVCandcanbereusedformanyyearsto

come. Kit includes comprehensive safety instructions, procedure and demonstration notes.Calciumcarbideandasafetylighterarerequiredandsoldseparately.


AP7311 Knock Your Socks Off Apparatus Kit—Reaction of Calcium Carbide $24.50

C0346 Calcium Carbide, 100 g 8.90

AP8960 Butane Safety Lighter 7.70

GOGo to flinnsci.com and type in the keyword

How To

Video Knock Your Socks Off

AP7311vid

Incomplete Combustion— Application in Daily Life

Never use a charcoal or gas grill inside your home!

The balanced chemical reaction in Equation2representsthecomplete combustion of acetylene to produce carbon dioxide and water. Com-plete combustion of a hydrocarbon occurs when oxygen gas in the surrounding air mixes completely and is present in the stoichiomet-ric mole ratio to react completely with the amount of hydrocarbon. For acetylene, the mole ratio is five moles of oxygen per two moles of acetylene, or 2.5:1.

If a hydrocarbon is burned in a confined area, such as indoors, the amount of oxygen is insufficient for complete combustion. When this happens, incomplete combustion results in the dangerous build-up of poisonous carbon monoxide gas, shown in the following equation for acetylene.2C2H2 + 3O2 →4CO+2H2O

In practice, combustion of char-coal, natural gas, gasoline, etc. often generates some carbon mon-oxide as a by-product. That’s why it’s so important to remember the vital consumer safety rule shown above. NEVER use a generator,charcoal grill, hibachi, lantern, camp stove or other gasoline- or charcoal-burning device inside your home, basement or garage, or outside near an open window.


55

IntroductionObserve slow-motion precipitation in a Petri dish, providing evidence for diffusion of ions and their resulting combination reactions.

Concepts•Diffusion • Precipitation

MaterialsSilver nitrate, AgNO3 Document projector

Sodiumchloride,NaCl Petridishes,2

Sodium iodide, NaI Spatulas, 3

Water, distilled

Safety PrecautionsSilver nitrate is a corrosive solid and can cause burns. It may also stain skin and clothing—avoid contact with eyes and skin. Sodium iodide is slightly toxic by ingestion. Wear chemical splash goggles, chemical-resistant gloves, and a chemical-resistant apron. Please review current Mate-rial Safety Data Sheets for additional safety, handling, and disposal information.

Procedure 1. Place two Petri dishes side-by-side and fill each approx-

imately one-third full with distilled or deionized water. 2. Use a clean spatula to add a small scoop of silver nitrate

crystals to the water at one edge of the Petri dish. 3. Directly opposite the silver nitrate, add a small scoop of

sodium iodide crystals to the water using a clean spatula (see Figure 1).

4. The solids will slowly dissolve and diffuse through the water. As the ions meet in the center of the Petri dish, a line of precipitate will begin to form and continue to grow across the length of the dish (see Figure 2).

5. (Optional) Repeat steps 2–5 in a second Petri dish replacing the sodium iodide with sodium chloride.

DisposalPlease consult your current Flinn Science Catalog/Reference Manual for general guidelines and specific procedures, and review all federal, state and local regulations that may apply, before proceeding. Filter the mixtures to recover silver halides. The filtrate may be disposed of according to Flinn Suggested Disposal Method #26a.

Tips•For improvedviewingby the entire class, use adocument

or overhead projector. Place an acetate sheet under the Petri dishes to protect the projector from spills.

Emerging LineObserve Diffusion and Precipitation

•Manydifferent saltsmaybe used—any two solutions thatform a precipitate will react in a similar fashion using this method. You may even try adding three salts to the same Petri dish to achieve a y-shaped line.•The reaction between silver nitrate and sodium iodide is

interesting since both start out as colorless salts but form a yellow precipitate.•GlassorplasticPetridishesmaybeused.

DiscussionThe precipitate formed in the first reaction is silver iodide.AgNO3(aq) + NaI(aq) → AgI(s) + NaNO3(aq) Reaction 1

orAg+(aq) + I–(aq) → AgI(s) (yellow)

The precipitate formed in the second reaction is silver chloride.AgNO3(aq) + NaCl(aq)→ AgCl(s) + NaNO3(aq) Reaction 2

orAg+(aq) + Cl–(aq) → AgCl(s)(white)

ReferenceFlinn ChemTopic™ Labs, Volume 6, Irene Cesa, Ed., Flinn Scientific, Inc., Batavia, IL, 2004.

Materials for Emerging Line are available from Flinn Scientific


S0274 Silver Nitrate, 5 g $16.45S0083 Sodium Iodide, 25 g 11.80


Figure 1. Figure 2.

Save on Silver NitrateStretch Your Chemistry BudgetChemistry teachers need to be aware that the price of precious metals skyrocketed causing the price of silver nitrate to soar. Fortunately, Flinn Scientific stocked up before prices peaked and we’re passing the savings on to you.

Compare these 2012 published prices of reagent grade silver nitrate.

5 g 25 g 100 g 500 g

Flinn Scientific $16.45 $ 64.95 $235.00 $ 995.00

Carolina 20.95 103.00 390.00 1,690.00

Fisher NA 120.00 NA 2,900.00

Sargent-Welch 22.00 95.95 320.00 1,125.00

Frey NA 167.80 646.65 NA

Science Kit 22.00 95.95 320.00 1,125.00

Wards 22.00 95.95 320.00 1,125.00

If you buy silver nitrate anywhere else, you’re wasting money that you could use to buy other science supplies you need from Flinn.

Get more for your money.Order all of your supplies from Flinn!



66

Product Spotlight

Choosefromsixdurablebalancesdesignedforyoursciencelab. Flinn Balances will meet all your needs—from everyday student use to AP chemistry labs.FlinnElectronicBalancesfeature:•Largedigitaldisplay •Stainlesssteelpan

•Overloadprotection •Flip-downcover

•Two-yearwarranty •StackabilityEachbalanceincludesa120-voltACadapter.Allbalances

except OB2097 will run on a 9-volt battery, sold separately. OB2097 includes a draft shield to ensure accuracy.

Catalog No. OB2093 OB2094 OB2095 OB2096 OB2090 OB2097

Capacity (g) 300 510 1000 210 410 120

Readability (g) 0.1 0.1 0.1 0.01 0.01 0.001

Precision (g) ±0.1 ±0.1 ±0.1 ±0.01 ±0.02 ±0.002

Pan Size 14.2 cm × 13.0 cmDiameter

9.7 cmDiam.

14.2 cm× 13 cm

9.7 cmDiam.

Price/Each $155.65 $188.65 $260.75 $272.00 $385.10 $402.45

Price/Each 5 Units or more

147.85 179.20 247.70 258.40 365.85 382.35

Flinn Electronic BalancesAccurate and Dependable

Protective cover

Calibrationweight

Keypadcontrols

Leveling bubble

Extra largedigital display

Stainless steelweighing pan

Percent CompositionStudent Lab KitA real-world application for a fundamental con-cept—percent composi-tion!Calciummagnesiumacetate (CMA) is soldcommercially as a “green” chemical de-icer. It is less corrosive than salt for melting ice and protects delicate pet paws. Deter-mine the percent compo-sition of calcium versus magnesiumacetateinCMAusingasimplethree-stepprocess.TitratewithEDTAtodeterminetotalcalciumandmagnesiumcontent, precipitate calcium ions with ammonium oxalate, andthencarryoutasecondEDTAtitrationonthefiltrateto measure the amount of magnesium. Quantitative lab helps develop good lab skills and provides relevant experience for calculating moles, molar mass, and percent composition.

Kit includes reproducible student handouts, background in-formation, Teacher Notes with sample data and answers to all questions, and all chemicals and consumable supplies. Note: Burets are required and may be purchased separately.


AP7502 Percent Composition Lab— Calcium Magnesium Acetate

$27.95

GP1087 Buret, Flint Glass with Teflon Stopcock, 50-mL 59.50

Stop worrying about cleanup after those fun but messy chemical demonstrations! Perform demonstrations in this large fiberglass tray—the rounded edges and 2ʺ lip will contain all of the chemi-cal overflow and make cleanup a breeze. It can also be useful when dispensing chemicals to contain spills. Fiberglass won’t corrode or warp. It resists acid and alkaline solutions (in the pH range of 3–10) and most solvents. Tray measures 30ʺ x 20ʺ x 2ʺ.


AP5429 Demonstration Tray $76.90

Demonstration TrayMakes Cleanup Easier

GOGo to flinnsci.com and type in the keyword

How To

Video Demonstration Tray

AP5429vid


Modern MaterialsAmazing Multi-Demo KitFrom nanotechnology to nitinol—bring amazing modern materials to the classroom! This multi-demonstration kit includes:•Ferrofluid—Dramatically

demonstrate the unique physical properties of amagnetic fluid createdbyextremely small Fe3O4 particles. This application was invented by NASA to control liquids in space!•Liquid crystals—matter

that behaves as both a liquid and a solid. Show students how temperature changes the molecular alignment of the crystalscreating different colors.Applicat ions include liquid crystal displays (LCD)forlaptops,opticalimaging,andmoodrings.•Nitinol wire—a nickel–

titanium metal alloy that has a “memory.” Shape the nitinol wire incoldwater,placeitintohotwaterandwatchitquicklyspringback into its original shape!


AP7531 Amazing Modern Materials—Chemical Demonstration Kit $69.95


77

Takeadvantageof the funandexcitementofholidaysto teach chemistry concepts using Flinn’s “seasonal” kits. Demonstrations kits contain enoughmaterials to performeachdemoseventimes.

The Reappearing Pumpkin Demo KitPerform Hallow-een magic with this fun demonstration.Pumpkin face dis-appears and then reappears over and over again. Shake the flask and the face disappears asa dark blue color masks the appear-ance of the pump-kinface.Undisturbed,thepumpkinreappearsagain!Florenceflask(GP3095)soldseparately.

Blinking Holiday Colors Demo KitTwo beakers magically swapChristmascolors,redto green and green to red! Each solution contains a unique mixture of indica-tors.At lowpH,onemix-ture is red, the othergreen. At high pH,the red indicator turns green and the green switches to red. When one reactant is con-sumed,thepHrapidlyincreasesandthecolorsreverse.

Silver Ornament Lab KitCreate 24 stunning silver ornaments to demonstrate a practical applica-tion of a classic re-dox reaction. Sim-ply mix dextrose with a basic solu-tion containing si lver–ammonia complex ions in a glass ornament ball, swirl, and voilá—a lustrous silver mirror plates out on the inside of the ornament.See all of our seasonal demonstration kits, including “ChemysteryofHalloween”(AP2102)and“AChrist-masofChemistry”(AP6281)onpages374–378inthe2012 Flinn Science Catalog/Reference Manual or by searching keyword “seasonal” at flinnsci.com.


AP6384 The Reappearing Pumpkin $21.70

GP3095 Florence Flask, 1000-mL, Flat Bottom 15.90

AP6858 Blinking Holiday Colors 21.35

AP7189 Silver Ornaments Holiday Laboratory Kit 63.90

Holiday Demos and LabsSplash GogglesPopular Safety EyewearThese chemical splash goggles providecomfort,protectionanddurability.Thesoftvinyldoubleflangegentlyconformstofacialcontours.The2-mmthickclearlenses are made of polycar-bonate. Covered lens channelandfourcoveredventsprovide ventilation. Non-vented goggles are also available. (Some eye-care professionals say wearersof contact lenses should use anon-vented goggle when organ-icsolventsarepresent.)

See our complete selection ofsafetyeyewearandaccesso-riesonpages1096–1100inthe2012 Flinn Science Catalog/Reference Manual and at flinnsci.com.

Catalog No. Description Price/EachPrice/Each Qty. 72–299

Price/Each Qty. 300 or more

AP3306 Vented Goggle $ 6.65 $6.25 $5.30

AP3309 Vented Goggle with fog-free lens

7.85 7.45 7.05

AP3312 Vented Goggle, Small Size*

8.05 7.56 7.24

AP3315 Vented Goggle, Small Size* with fog-free lens

10.10 9.49 9.09

*Smallsizegogglesaresuitableforpetiteindividualsandyoungerstudents.

P.O. Box 219 1-800-452-1261Batavia, Illinois 60510 Fax: 1-866-452-1436 E-mail:[email protected] www.flinnsci.com

Presorted StandardU.S. Postage

PAIDCarol Stream, IL 60188

Permit No. 1369

RETURN SERVICE REQUESTED

In this Flinn Fax!For Chemistry Teachers• UnderstandingtheRevisedOSHARules

• SaveonSilverNitrate• ActivitiestoHelpYourStudentsSucceed!

From the Flinn Mailbag“ I love Flinn! You make teaching chemistry a joy! As

always, my order was complete, prompt, and a wonderful bargain over other vendors!”

—Kimberly Kass, Argyle High School, TX

“ As always, thank you for your continued prompt, excellent service. You provide top-quality equipment and continue to be the best chemical supplier for education that I have found.”

—RogerFelch,CastleViewHighSchool,CO

“ I can’t believe how quickly this order was processed and shipped. It was ordered on a Wednesday and I had it by that Friday. Everything was included and nothing was broken. Amazing service! Thank you so much.”

—Anne Nyseth, Holmen High School, WI

It’s Here Already!Are you irritated by frequent, lengthy backorders from other science supply companies? Don’t accept second-rate service! Cancel those annoyingbackorders and reorder fromFlinn.Before you know it, you’ll be saying, “Oh my gosh, it’s here already!”CallFlinntodayat1-800-452-1261.

Free Flinn Workshops at Fall NSTA Conferences

Make plans to attend Flinn’s demonstration shows and work-shops if you are going to a National Science Teacher Asso-ciation(NSTA)RegionalConferencethisfall.Youwilllearnnew and exciting demonstrations and experiments to share with your students. Free write-ups are provided. Visit the Flinn booth where you can sign up to win a free electronic balanceandmicroscope.Checkyourconferenceprogramforworkshop times and locations. Learn more about the confer-encesbyvisitingwww.nsta.org/conferences.

Louisville, KY October 18–20, 2012

Atlanta, GA November 1–3, 2012

Phoenix, AZ December 6–8, 2012

Revised OSHA

Rules Coming—

Learn the Details

—See Page 1—


14197 flinnfax 2012-4 chemistry flr

Documents