Our Essential Question: W Our Essential Question: → C S magnesium 24.31 sulfur 32.07 16 12 Is it a chemical reaction? _____ How could you prove it? Is it a chemical reaction? _____ How could you prove it? 2. Wood burns. What are the COOL signs of a chemical reaction you observed? 1. Ice melts. What are the COOL signs of a chemical reaction you observed? 3. Iron rusts. What are the COOL signs of a chemical reaction?