Wrap up/Launch

C₁₇H₁₇O₃N(s) +2C₄H₆O₃(l) --> C₂₁H₂₁O₅N(s) + 2C₂H₄O₂(l)

Does this chemical equation describe a physical or chemical change? Explain how you can tell.

Physical changes change the appearance of a substance but not the identity. Chemical changes change the substances into new substances.