Luis is helping his parents paint a border around the walls of a room. He uses a stencil to repeat the same design on each wall to form one long grapevine with a bunch of grapes every foot along its length. What type of chemical reaction does this best model?

The repeated stencil design represents many identical units joining together in a long chain. A reaction that links small repeating units (monomers) to form a large molecule (a polymer) is polymerization. Synthesis is a broader category of reactions that combine substances, but the repeating-chain pattern specifically models polymerization.

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