The activation energy needed for a reaction to occur is the distance between the top of the hill and where the reactants start. So if you were to read the y-axis at the top of the hill and read the y-axis where the reactants start, all you have to do is subtract those numbers to find the activation energy. If the top of the hill was at 100J and the reactants started at 60J, what would the activation energy be?

Match the vocabulary terms to their definitions. 1 . a long, chain-like set of molecules made up of repeating units joined end to end polymer 2 . a hard, brittle, heat- and corrosion-resistant material made by subjecting a nonmetallic mineral mixture to intense heat ceramic 3 . a plastic with low elongations that cannot be recycled thermoset 4 . a carbon fiber embedded in a polymer resin matrix thermoplastic 5 . a plastic with high elongations that can be recycled crystal 6 . a solid form resulting from the arrangement of atoms, ions, or molecules in definite geometric patterns composite