Ko te whākōkī: He matū ka whakatere ake, ka whakangāwari ake rānei i tētahi tauhohe matū. Heoi anō, kāore te whākōkī e tauhohe, kāore hoki e whakapaungia (RP 2009:454). / Catalyst: A substance which makes a chemical reaction faster or easier to carry out, but is not involved in the reaction, or does not get used up (RP 2009:454).

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