Moldy Bread Higher Example

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Lesplannen Voor Experimenten

Experimenteel Ontwerp

Door Oliver Smith

Experimenteel ontwerpen aanleren en studenten hun eigen vragen en hypothesen laten ontwikkelen kost tijd. Deze materialen zijn gemaakt om het proces te ondersteunen en te structureren, zodat docenten zich kunnen concentreren op het verbeteren van de belangrijkste ideeën in experimenteel ontwerp.




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Storyboard Beschrijving

Experimental Design - completed planning worksheet

Storyboard Tekst

  • 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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