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Across 5. charged particle that has either more or fewer electrons than protons. 6. chemical reaction in which two or more simple substances combine to form a new, more complex substance. 7. principle stating that matter is not created or destroyed during a chemical reaction. (3 Words) 9. change of one substance into a new substance. (2 Words) 11. anything that has mass and occupies space. 12. a material made of two or more elements that has the properties of metal. 15. chemical reaction in which energy is primarily given off in the form of heat. (2 Words) 16. study of the properties of matter and how matter changes. 17. a group of like or different atoms held together by chemical forces. 18. any property of a substance, such as flammability, that indicates whether it can undergo a certain chemical change. (2 Words) 19. in chemicals; the substance that reacts. 20. chemical reaction that breaks down compounds into simpler products.

Down 1. an orderly three-dimensional pattern of ions or atoms in a solid. 2. chemical reaction that requires heat energy in order to proceed. (2 Words) 3. any characteristic of a material, such as size or shape, that you can observe or attempt to observe without changing the identity of the material. (2 Words) 4. in a chemical reaction, the new substance that is formed. 8. force that holds atoms together in a compound. (2 Words) 10. process in which one or more substances are changed into new substances. (2 Words) 13. any change in size/shape, or state of matter in which the identity of the substance remains the same. (2 Words) 14. reaction in which one element replaces another in a compound or when two elements in different compounds trade places.