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During chemical reactions, atoms that make up the molecules of the starting substances are separated from each other. Is energy required to separate the atoms, or is energy released when the atoms are separated?

  1. Energy is always required to separate atoms of the reactant molecules.
  2. Energy is always released when atoms of the reactant molecules are separated.
  3. Whether energy is released or required depends on the temperature of the system.
  4. Whether energy is released or required depends on the types of atoms that are separated.
Distribution of Responses
Chart showing distrubtion of responses for Item EG034004
Scale Score for Item Difficulty
(200[Easy]-800[Difficult])
521
Students Responding Correctly
Group Correct Total Percent
Overall 988 3169 31%
Grades
  4–5N/AN/AN/A
  6–8 459 1602 29%
  9–12 529 1567 34%
Gender
  Male473147532%
  Female494161331%
Primary Language
  English893281532%
  Other6825227%

View data table