2. Chocolate Science

AQUiLA CHOCOLATE ACTIVITY

ChocolateScience

Learning objectives
– Observechangingstates – Demonstratereversiblechangesusinghotandcold – ResisteatingchocolateuntilthelastposibleminutealinthenameofSCIENCE !
O
1 hour + Individual , pairs , or small group work . Adult supervision required . Difficulty : Bit of a thinker

Yourmission

Whichtypeofchocolatemeltsthefastest ? Dark , milkorwhite ? Let ’ sconductahighlyscienti�cexperimentinorderto�nd out . Andyes , weknowwhatyou ’ rethinking . Youwilgettoeatsome – youjustneedtowaituntiltheend .

Getstarted

Phase 1 :
Makeyourprediction . Inwhatorderdoyouthinkthechocolatewilmelt ? Writedown youranswer .
Phase 2 :
Takefoursquaresofeachtypeofchocolateandplacethem inseparatefoilfruitpie dishes ; onefordark , oneformilkandoneforwhite . Useclothespegsto�xtheseto thesideofalargeplasticcontainer .
You will need – Smalblocksofdark , milkand whitechocolate – Foilfruitpiedishes – Threelargeplasticcontainers – Clockorstopwatch Cocktailsticks – Threeclothespegs – Hotwater
Phase 3 :
Askanadulttoboilsomewater . Whenitisready , yourgrownupshouldtipthehot waterintothelargeplasticcontainer , ensuringthatitisnottoofulandthatno watergetsintothedishescontainingthechocolate . Startyourtimerassoonasthe hotwaterisadded .
Phase 4 :
Keepcheckingonthechocolatepiecesastheybegintomelt . Attheendofeach minuteyoucanstirthem withacocktailstickastheybegintoliquefy . Notethetime takenforeachofthesamplestofulymeltandchangeintoaliquid . Recordyour results . Whatdotheyshow ?
Phase 5 :
Nowitistimetoreversetheprocess . Placethetraysofmeltedchocolateintothe fridgeandleavethem untiltheysolidify .
Continues on page 2
Page 1 of 2