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 similar units joining together to make one long structure. In chemistry, polymerization joins small repeating molecules (monomers) into a long-chain molecule called a polymer. So this best models polymerization, not just the formation of a single new compound as in synthesis.

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