Physical change - A change that does not form a new substance, Chemical change - A change that forms one or more new substances, Atom - The smallest unit of matter, Molecule - Two or more atoms bonded together, Element - A pure substance made of one kind of atom, Compound - Two or more elements chemically combined, Mixture - Two or more substances physically blended, not chemically combined, Chemical reaction - Process where substances change into new substances, Product - The substance formed after a reaction, Reactant - The starting substance in a chemical reaction, Evidence of chemical change - Signs such as gas, color change, heat, or precipitate, Gas production - Bubbles forming during a reaction, Color change - A visual change in color caused by a reaction, Temperature change - Heat released or absorbed in a reaction, Conservation of mass - Matter is not created or destroyed in a reaction, State of matter - Form of matter (solid, liquid, gas), Melting - Solid turns into liquid, Freezing - Liquid turns into solid, Evaporation - Liquid turns into gas, Dissolving - A substance spreads out evenly in another substance, Rusting - Iron reacts with oxygen forming a new substance, Burning - A substance reacts with oxygen and releases heat and light, Breaking - A big piece becomes smaller pieces but stays the same substance, Boiling - Liquid turns to gas with bubbles forming throughout,

Unit 3 Train Game

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