化學能 (Hòa-ha̍k-lêng) (化學能) 是 (sī)一 (chi̍t)種 (chióng)內能 (lōe-lêng),指 (chí)一寡 (chi̍t-kóa)需要 (su-iàu)經由 (keng-iû)化學 (hòa-ha̍k)反應 (hoán-èng)來 (lâi)釋放 (sek-hòng)出來 (chhut-lâi)的 (ê)能量 (lêng-liōng)。比論 (Pí-lūn)媒碳 (môe-thòaⁿ)的能量是透過 (thàu-kòe)燃燒 (jiân-sio)來釋放出來的,貯存 (thú-chûn)佇 (tī)媒碳來短 (lāi-té)的能量就 (chiū)是化學能。電池 (Tiān-tî)內底 (lāi-té)的化學物質 (bu̍t-chit)是藉著 (chioh-tio̍h)化學變化 (piàn-hòa)來產生 (sán-seng)電氣 (tiān-khì)。性命體 (Sèⁿ-miā-thé)體內 (thé-lāi)的呼吸 (ho͘-khip)作用 (chok-iōng)佮 (kap)光合 (kng-ha̍p)作用所 (só͘)產生的能量嘛 (mā)算 (sǹg)是化學能。
因為 (In-ūi)化學能是佇化學反應時 (sî)產生的,所以 (só͘-í)是一種藏朝咧 (chhàng-tiâu-leh)的能量,袂當 (bē-tàng)直接 (ti̍t-chiap)提來 (the̍h-lâi)作工 (chok-kong),只有 (chí-ū)佇發生 (hoat-seng)化學變化的時,才 (chiah)釋放出來,變成 (piàn-sêng)熱能 (jia̍t-lêng)抑是 (ia̍h-sī)其他 (kî-thaⁿ)形式 (hêng-sek)的能量。