Let's think step by step! What is required before a chemical change?\nOptions:\n- (A) kinetic energy\n- (B) energy usage\n- (C) activation push\n- (D) activation energy\n- (E) activation switch\n- (F) activation power\n- (G) Burning fuel and air\n- (H) Evaporation
The thinking starts now:
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All chemical reactions require activation energy to get started. Chemical changes are a result of chemical reactions. Activation energy must be used before a chemical change happens. The final answer: (D).
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