The word photochemical is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 30
Highest Scoring Words With Friends™ Play In The Letters photochemical
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Seven Letter Word Alert: (46 words)
accompt, alethic, aloetic, cacolet, calcite, caliche, caltech, capitol, chalice, chaotic, chaplet, cholate, choleic, climate, coalite, coalpit, cochlea, coeliac, cometic, comical, compact, compile, compote, copilot, ectopia, ectopic, epochal, ethical, haplite, hepatic, hoplite, icecool, impeach, metical, ootheca, optical, optimal, piccolo, plicate, polecat, polemic, potamic, pothole, potiche, taphole, topical