Chemistry LabChemistry Lab

By Lin WozniewskiBy Lin Wozniewski

lwoz@iun.edulwoz@iun.edu

DisclaimerDisclaimer

This presentation was prepared using draft This presentation was prepared using draft rules.  There may be some changes in the rules.  There may be some changes in the final copy of the rules.  The rules which will final copy of the rules.  The rules which will be in your Coaches Manual and Student be in your Coaches Manual and Student Manuals will be the official rulesManuals will be the official rules

What do they need to be able to do What do they need to be able to do every year every year? every year every year?

Interpretation of Interpretation of experimental data experimental data (tabular and/or graphic) (tabular and/or graphic)

Observation of an Observation of an experiment set up and experiment set up and running running

Computer or calculator Computer or calculator sensors/probes sensors/probes

Stoichiometry : mole Stoichiometry : mole conversions and conversions and percentage yieldpercentage yield

Nomenclature and Nomenclature and formula writing - symbols formula writing - symbols and charges for the and charges for the following ions by memory: following ions by memory: nitrate, carbonate, nitrate, carbonate, phosphate, acetate, phosphate, acetate, sulfate, ammonium, sulfate, ammonium, bicarbonate, and bicarbonate, and hydroxide (“ite” forms of hydroxide (“ite” forms of “ates” listed) “ates” listed)

SafetySafetyStudents must wear:Students must wear: Closed shoesClosed shoes Slacks or skirts that come to the anklesSlacks or skirts that come to the ankles Sleeved Shirt (if wearing a lab apron)Sleeved Shirt (if wearing a lab apron) Lab coat or lab apronLab coat or lab apron Indirect vent or unvented chemical splash Indirect vent or unvented chemical splash

proof goggles. No impact glasses or proof goggles. No impact glasses or visorgogs are permittedvisorgogs are permitted

What the Students Should BringWhat the Students Should Bring

Safety gearSafety gear

Something to write withSomething to write with

What the Students Should Not BringWhat the Students Should Not Bring

Anything else

This includes notes

What the Supervisor ProvidesWhat the Supervisor Provides

Everything the student will needEverything the student will need This may include:This may include:

GlasswareGlasswareReagentsReagentsBalancesBalancesHot platesHot platesThermometersThermometersProbesProbesMagnetsMagnetsStirrersStirrers

How to prepare participantsHow to prepare participantsMake sure students read the directions and pay Make sure students read the directions and pay particular attention to the description of the particular attention to the description of the event (The Competition) event (The Competition)

Have them do many experiments together Have them do many experiments together

Have them determine their individual strengths Have them determine their individual strengths

Divide (and conquer) tasks during competition Divide (and conquer) tasks during competition

Check each other’s work Check each other’s work

How to prepare participantsHow to prepare participants

Get as many lab books from your Get as many lab books from your chemistry teacher as possible & have chemistry teacher as possible & have students explore labs by topic and do the students explore labs by topic and do the ones that appear consistently ones that appear consistently

Changes for 2011 Changes for 2011

1 new topic & 1 new topic & 1 old topic1 old topic: : Oxidation/ReductionOxidation/Reduction Aqueous SolutionsAqueous Solutions

Oxidation/ReductionOxidation/ReductionStudents must be able to write oxidation Students must be able to write oxidation

and reduction half reactions, assign and reduction half reactions, assign oxidation numbers, balance redox oxidation numbers, balance redox reactions in neutral, acidic, and basic reactions in neutral, acidic, and basic solutions, and calculate standard cell solutions, and calculate standard cell potentials using a table of standard potentials using a table of standard reduction potentials. reduction potentials.

Oxidation/Reduction ActivitiesOxidation/Reduction ActivitiesUse a sequence of redox reactions to construct an Use a sequence of redox reactions to construct an activity seriesactivity seriesConstruct a simple voltaic cell and measure its Construct a simple voltaic cell and measure its potentialpotentialStoichiometry and electrochemical processes (such as Stoichiometry and electrochemical processes (such as electrochemical deposition)electrochemical deposition)

Construct simple electrolytic cells. At state and Construct simple electrolytic cells. At state and national levels, knowledge of fuel cells may be national levels, knowledge of fuel cells may be includedincludedAt the state and national levels knowledge and At the state and national levels knowledge and application of the Nernst equation and common application of the Nernst equation and common storage batteries may be included.storage batteries may be included.

Oxidation/Reduction Activities Oxidation/Reduction Activities Series of redox reactionsSeries of redox reactions Small pieces of metal have a drop of another Small pieces of metal have a drop of another

metal’s ion put on them to see if there is a metal’s ion put on them to see if there is a reaction or notreaction or not

Or a small piece of metal is dropped into a Or a small piece of metal is dropped into a test tube containing another ion’s metal to see test tube containing another ion’s metal to see if there is a reaction or not.if there is a reaction or not.

Chlorine water is added to a solution of a Chlorine water is added to a solution of a halide and then hexane is added.halide and then hexane is added.

A titration of an Iron(II) ion is done with a A titration of an Iron(II) ion is done with a strong oxidizer such as permanganate or strong oxidizer such as permanganate or Cerium (IV)Cerium (IV)

Oxidation/Reduction ActivitiesOxidation/Reduction Activities

Electrolysis of water Electrolysis of water Can be used as both a redox and aqueous Can be used as both a redox and aqueous

solution activity.solution activity. Students can investigate not only the redox Students can investigate not only the redox

reaction involved in the production of reaction involved in the production of hydrogen and oxygen from the water, but the hydrogen and oxygen from the water, but the resulting production of hydronium and resulting production of hydronium and hydroxide ions.hydroxide ions.

Oxidation/Reduction ActivitiesOxidation/Reduction Activities

Electrodeposition is a broad industrial term Electrodeposition is a broad industrial term that can refer to:that can refer to: ElectroplatingElectroplating ElectrocoatingElectrocoating E-coatingE-coating Cathodic electrodepositionCathodic electrodeposition Electrophoretic coatingElectrophoretic coating Electrophoretic paintingElectrophoretic painting

Oxidation/Reduction ActivitiesOxidation/Reduction Activities

At the state and national levels the Nernst At the state and national levels the Nernst equation may be tested.equation may be tested. Equation usually used at low concentrations.Equation usually used at low concentrations.

][

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05916.010 Ox

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Oxidation/Reduction ActivitiesOxidation/Reduction Activities

http://education.ti.com/educationportal/http://education.ti.com/educationportal/activityexchange/activity_list.do?cid=usactivityexchange/activity_list.do?cid=us

http://chemtutor.com/redox.htmhttp://chemtutor.com/redox.htm

http://web.archive.org/web/http://web.archive.org/web/20050830214525/library.thinkquest.org/20050830214525/library.thinkquest.org/10429/low/redox/redox.htm10429/low/redox/redox.htm

Aqueous SolutionsAqueous SolutionsStudents will demonstrate an understanding of the Students will demonstrate an understanding of the principals and properties of aqueous solutions. principals and properties of aqueous solutions. They must be able to calculate solution They must be able to calculate solution concentrations given quantities of solute and concentrations given quantities of solute and solvent, and to calculate quantities of material solvent, and to calculate quantities of material required to produce a solution of specified required to produce a solution of specified concentration. Molarity, molality, mass concentration. Molarity, molality, mass percentage, and parts per million may be required. percentage, and parts per million may be required. Students are also required to demonstrate an Students are also required to demonstrate an understanding of colligative properties. At the understanding of colligative properties. At the state and national levels, conversions between state and national levels, conversions between concentration units may be required.concentration units may be required.

Aqueous ActivitiesAqueous ActivitiesUse the concept of density to experimentally Use the concept of density to experimentally determine the concentration of a solution.determine the concentration of a solution.Determine solution concentration using a series of Determine solution concentration using a series of standard absorbencies and Beer’s Law.standard absorbencies and Beer’s Law.Use freezing point depression to determine the Use freezing point depression to determine the molar mass of a solute.molar mass of a solute.Use titration to determine an unknown concentration.Use titration to determine an unknown concentration.Identify and explain factors that effect solution Identify and explain factors that effect solution formation.formation.Construct a solubility curve.Construct a solubility curve.Determine whether a solution is saturated, Determine whether a solution is saturated, unsaturated or supersaturated unsaturated or supersaturated

Aqueous ActivitiesAqueous Activities

http://chemtutor.com/mols.htm#dvhttp://chemtutor.com/mols.htm#dv

http://web.archive.org/web/http://web.archive.org/web/20070505005726/library.thinkquest.org/20070505005726/library.thinkquest.org/10429/low/sol/sol.htm10429/low/sol/sol.htm

Resources: TI Activity Exchange Resources: TI Activity Exchange

http://education.ti.com/educationportal/http://education.ti.com/educationportal/activityexchange/BrowseResult.do?activityexchange/BrowseResult.do?cid=US&subName=Science&subAreaNamcid=US&subName=Science&subAreaName=Chemistry&subAreaId=5028&catName=e=Chemistry&subAreaId=5028&catName=Kinetics&catId=1097&aCount=6&brsOpenKinetics&catId=1097&aCount=6&brsOpenNode=bt1.o%2816%29Node=bt1.o%2816%29

ScoringScoring

50% Oxidation/Reduction50% Oxidation/Reduction

50% Aqueous Solutions50% Aqueous Solutions

ResourcesResources

For Event SupervisorsFor Event Supervisors http://mypage.iu.edu/~lwoz/socrime/index.htmhttp://mypage.iu.edu/~lwoz/socrime/index.htm

For Lesson Plans for classroom useFor Lesson Plans for classroom use http://mypage.iu.edu/~lwoz/socrime/index.htmhttp://mypage.iu.edu/~lwoz/socrime/index.htm

Questions???Questions???

Thank youThank you