01 Chemistry Research

This event is limited to the first 15 entries

2018 Topic: Polymorphism of Chocolate

OBJECTIVE & BACKGROUND

Chocolate is beyond doubt one of our most remarkable foods and many would agree it deserves a food group all for itself. It can be sweet or bitter, smooth or astringent, hard or brittle, creamy or dry. For centuries it was only available to us as a drink until humanity cracked the code to the making of delicious, solid chocolate we've grown to know and love today: its crystalline structure. In this event you will unravel the secrets behind the polymorphism of chocolate and discover why only one of these structures delivers the ultimate promise of melting in the mouth and not in the hand. 

EVENT SPECIFIC REQUIREMENTS:

Part 1 - Conduct Literature Research to Address the following 

  1. A brief history of chocolate
  2. The chemistry of chocolate:
    • Find out how many different types of chocolate exist and what are the differences between them.
    • Determine which ingredients are used to make chocolate and their chemical structure; indicate which ingredient is responsible for the crystalline structure of chocolate.
    • Investigate how phase transitions between different crystalline structures of chocolate occur. Understand the effects of temperature and time on crystalline structure.
    • Learn about the crystallization process and understand the role of nucleation in crystallization.
  3. The procedures for making the various forms of chocolate. 

Part 2 - Conduct Original Research

  • Design and conduct experiments to create at least three crystalline structures of chocolate, including the edible form, from basic ingredients.
  • Analyze and identify the created structures according to their physical properties.
  • Create a short video of your experiment. The video should be under 10 minutes and be of high enough quality to be posted on YouTube for others to view in the future.

Part 3 - Create a Written Report of What You Learned in Parts 1 and 2

A research paper that includes information addressing the following and that demonstrates understanding and information from the literature research above. This should include the following:

  • Introduction including a brief history of chocolate as well as a description of the various forms and how they differ
  • Describe the chemistry involved in the crystallization of chocolate. Include the effects of temperature and time on the quality of chocolate.
  • Describe the experimental setup and procedures you ran. Diagrams may be useful here
  • Show and analyze your results.  Tables may be useful here.  Discuss the difference in the physical properties of the different crystalline structures you created.
  • Draw conclusions on how to optimize the production and storage of high quality edible chocolate.
  • Include a link to your video on YouTube in the report.

Event Day

Teams will make a short (three minutes) presentation via PowerPoint/Slides or poster.  Teams are expected to bring the different chocolates that they created during their research for viewing.  Presentations will be scheduled for the morning of the Chemistry Olympics.  (6 minutes maximum: 3 minute prepared presentation + 3 minutes Q&A) – This presentation should focus solely on the process of creating the different crystalline forms of chocolate and should highlight the students’ understanding of polymorphism and phase transitions.  Specific laboratory data collected should be presented to the judges in a graphical/pictorial manner.  Conclusions from experimentation should be clearly supported by the data provided.

 

GENERAL RESEARCH REQUIREMENTS

IMPORTANT:  Learn about the requirements concerning Primary Sources, formatting and citations for your research paper: Research Guidelines and Requirements

The Chemistry Research Paper must be received by the NJCO Coordinator by the deadline indicated in:: Requirement Overview

GENERAL JUDGING CRITERIA

Written report, 35% 

Experiment and Results, 35%

Presentation, 30%