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Across 1. The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change. (5 words) 6. A mixture i n which substances are evenly distributed throughout the mixture. 9. A characteristic of a pure substance that can be observed without changing it into another substance. (2 words) 10. A single kind of matter that is pure and has a specific set of properties. 12. The force that holds atoms together. (2 words) 15. Heat exiting. 16. Heat entering. 17. Two or more substances that are mixed together but not chemically combined.

Down 2. The basic particle from which all elements are made. 3. A characteristic of a pure substance that describes its ability to change into a different substance. (2 words) 4. A neutral particle made of two or more atoms joined by covalent bonds. 5. A well-mixed mixture containing a solvent and at least one solute that has the same properties throughout. 7. A change in which one or more substances combine or break apart to form new substances. (2 words) 8. A mixture in which pure ubstances are unevenly distributed throughout the mixture. 9. A change in a substance that does not change its identity. (2 words) 11. A pure substance made of two or more elements chemically combine. 13. A pure substance that cannot be broken down into other substances by chemical or physical means. 14. Anything that has mass and occupies space.