Customizable Design of Experiments Project Ideas for High School: Moldy Bread
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Explorando a Arte do Design Experimental: um Guia Passo a Passo Para Estudantes e Educadores
Por Oliver Smith
Ensinar design experimental e deixar os alunos desenvolverem suas próprias perguntas e hipóteses leva tempo. Esses materiais foram criados para dar suporte e estruturar o processo para permitir que os professores se concentrem em melhorar as ideias-chave no design experimental.
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Storyboard Descrição
Experimental Design - completed planning worksheet
Texto do Storyboard
- 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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