Decomposers Activity 2.3 Directions


1. Review for the quiz.

Ask students which main ideas about atoms and molecules they remember from the Systems and Scale unit. Remind students of three important facts about atoms:

  • Atoms last forever (except in nuclear changes).
  • Atoms make up the mass of all materials.
  • Atoms are bonded to other atoms in molecules.

Review what students learned about molecules in food and how to read nutritional labels. Remind them that they can identify molecules with chemical energy by their bonds (C-C and C-H). Remind them how to read nutritional labels to find different molecules, to find calories, and to find if the food has chemical energy.