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Item RG031003: The reactants of photosynthesis have less chemical energy than the products because energy from the sun is converted to chemical energy during photosynthesis.

A chemical reaction called photosynthesis occurs in a tree as the sun shines on its leaves. During this reaction, water and carbon dioxide (the reactants) react to form sugars and oxygen (the products).

How does the chemical energy of the reactants (water and carbon dioxide) compare to the chemical energy of the products (sugars and oxygen)?

  1. The reactants have more chemical energy than the products because energy is always given off during chemical reactions.
  2. The reactants have less chemical energy than the products because energy is created when sugars are made during photosynthesis.
  3. The reactants have less chemical energy than the products because energy from the sun is converted to chemical energy during photosynthesis.
  4. The reactants have the same amount of chemical energy as the products because the amount of energy given off during photosynthesis is balanced by the amount of energy from the sun that is converted to chemical energy.
Distribution of Responses
Chart showing distrubtion of responses for Item 031003
Scale Score for Item Difficulty
(200[Easy]-800[Difficult])
542
Students Responding Correctly
Group Correct Total Percent
Overall 886 3948 22%
Grades
  4–511047223%
  6–8 404 1809 22%
  9–12 372 1667 22%
Gender
  Male400174823%
  Female456208022%
Primary Language
  English792354322%
  Other6327023%

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