chemical reaction - A process where substances combine or break apart to make completely new substances., reactant - The materials you start with before a chemical reaction happens., precipatate - A solid that suddenly forms when two liquids are mixed., exothermic - A chemical change that releases heat, making things feel warmer., endothermic - A chemical change that takes in heat, making things feel cooler., gas production - When bubbles or fizzing show that a new gas is being made., color change - A lasting change in color that shows a new substance has formed., oder change - A new or different smell created because of a chemical change.,

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