Wednesday, 1 October 2014

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Mini-Task


Daris:
Question: Which drink contains the most caffeine?
Independent Variable: Way we conduct the experiment
Dependent Variable: Type of drink
Controlled Variable: The amount of drink that is taken to conduct the experiment
Hypothesis: I think homemade brewed coffee contains the most amount of caffeine.
Literature Review: From theguardian.com(n.d.) and ilovecoffee.jp(n.d.) , I learnt that brewed espresso contains the most caffeine.


Augustine Yap:
Question: Which soft drinks react most violently with mentos?
Independent Variable: Kind of soft drink
Dependant  variable: The height of the fountain that shoots out the top
Controlled variable: The amount of the drink, amount of mentos, type of mentos
Hypothesis: Diet coke reacts most violently to mentos.

Literature Review:
     The numerous small pores on the candy's surface cause the release of carbon dioxide (CO2) gas from the soda, resulting in the rapid expulsion of  foam.
     Mythbusters (2006) concluded that the potassium benzoateaspartame, and CO2 gas contained in the Diet Coke, in combination with the gelatin and gum arabic ingredients of the Mentos, all contribute to the formation of the foam.
     The structure of the Mentos is the most significant cause of the eruption due to nucleationMythBusters (2006) reported that when fruit-flavored Mentos with a smooth waxy coating were tested in carbonated drinks there was hardly a reaction, whereas mint-flavored Mentos (with no such coating) added to carbonated drink formed an energetic eruption, supporting the nucleation-site theory. According to Mythbusters (2006), the surface of the mint Mentos is covered with many small holes that increase the surface area available for reaction (and thus the quantity of reagents exposed to each other at any given time), thereby allowing CO2 bubbles to form.
Essential questions:
What is science?

Science is a concept that we use to understand the universe, science is constantly being expanded and improved, and will never stop growing.

Scientific methods:
  1. Ask a question
  2. Do background research
  3. Construct a hypotesis 
  4. Test the hypothesis by constructing an experiment 
  5. Analyse the data and draw a conclusion
  6. Communicate the results

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