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Customizable Design of Experiments Project Ideas for High School: Moldy Bread
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Exploring the Art of Experimental Design: En Trinn-for-trinn-veiledning for Studenter og Lærere
Av Oliver Smith
Å undervise i eksperimentell design og la elevene utvikle sine egne spørsmål og hypoteser tar tid. Disse materialene er laget for å stillas og strukturere prosessen slik at lærere kan fokusere på å forbedre nøkkelideene i eksperimentell design.
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Experimental Design - completed planning worksheet
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Question-Whatdoyouwanttofindout?
ExplanationofHypothesis
Howdoestemperatureaffectmoldgrowthonbread?
Moldisalivingorganism.Thechemicalreactionsthatkeepthemold aliveareaffectedbytemperature.Whenweincreasethetemperature, thespeedofthesechemicalreactionsincreases.Therefore,ifwe increasethetemperature,moremoldshouldgrowonthebread.
Hypothesis
Prediction
IfIincreasethetemperature,thenmoldwillgrowmore quicklyonthebread.
Thepieceofbreadkeptinthewarmestlocationwill havethemostmoldgrowth.
IndependentVariable
Whatisyourrange?Howmanytimeswillyourepeatthetest?
Thetemperatureofstoragespace
Therewillbe2differenttemperatures: Refrigeratortemperature40°F(4°C) Roomtemperature73°F(23°C). Iwillrepeattheexperiment3timesateach temperature.
Howwillyoumeasureyourdependentvariable?
DependentVariable
Theamountofmoldonthebread
UsingatransparentgridIwillcalculatethe areaofthebreadwhichiscoveredinmold.
ControlledVariables
Howwillyoukeepthemconstant?
1.Amountoflight 2.Exposuretoair 3.Typeofbread 4.Sizeofbreadslice
1.Allthebreadsliceswillbeputinpaperbagsso theyareallinthedark. 2.Allthebreadsliceswillbeputinplasticbags. 3.Allthebreadsliceswillbetakenfromthesame loaf. 4.Breadsliceswillbechosenthatarethesamesize.
Riskasssessment
Howcantheserisksbemanaged?
Youcouldhaveanallergicreactiontomold. Youcouldinhalethemold.
Ifyouareallergictomolddon'ttakepartin theexperiment. Donotopenthebagsattheendofthe experimentanddisposeofthemcarefully.
Diagram
Materials-Whatdoyouneedto completethisexperiment?Why?
•6slicesofbreadthatarethesamesize •Arefrigerator-keptataconstanttemperature •Awarmplace-keptataconstanttemperature •6plasticbags-tokeepthebreadinandstopthe moldgettingout •6paperbags-tokeepthesunlightout •Aruler-tomeasurethemoldspots •Atransparentgrid-tohelpworkouttheareaof breadthatiscoveredinmold •Amarker-tolabelthebags
Plan-Howareyougoingtocarryitoutsafely?
1.Usethemarkerpentolabelthe6bagssotheycanbeidentifiedeasilylater.Placeasliceof breadineachbag. 2.Putthebagsinsidepaperbagsandput3intothefridgeand3inacloset. 3.Leavethebagsfor2days. 4.Checkthebagseverydayandrecordhowmuchofthesurfaceareaiscoveredinmold.This canbedoneusingatransparentgrid. 5.Recordyourresultsinatable. 6.Donotopenthebagsanddisposeofthemcarefullyintothetrash.
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