Moldy Bread Higher Example

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Eksperimenter Lektionsplaner

Eksperimentel Design

Af Oliver Smith

At undervise i eksperimentelt design og lade eleverne udvikle deres egne spørgsmål og hypoteser tager tid. Disse materialer er blevet skabt for at stilladsere og strukturere processen, så lærerne kan fokusere på at forbedre nøgleideerne i eksperimentelt design.




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Storyboard Beskrivelse

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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