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Across 1. Compounds that contain carbon and produce carbon dioxide and water when burned. 4. When a chemical equation has the same number of atoms on each side of the arrow. 8. A chemical reaction that gives off energy. 10. When an oxidizer gains electrons, it is said to be this. 11. A reaction that gives off energy. 12. (g) in a chemical equation. 15. A reaction that absorbs energy. 17. A type of chemical reaction where a free element replaces another element in a compound. 19. The most common form of energy given off in chemical reactions. 20. A way to describe a chemical reaction using formulas and symbols. 21. Means “reacts to form” in a chemical equation. 22. An insoluble compound that forms during a chemical reaction. 23. In a chemical formula, this shows the number of atoms. 24. 6.02 • 1023 25. The French chemist who established the law of conservation of mass. 27. Energy that has to be added to reactants to get the reaction started. 28. Substances that react in a chemical reaction. 29. A substance that slows down the rate of reaction without any change to itself. 30. (s) in a chemical equation. 31. (aq) in a chemical equation.

Down 1. When a metal loses electrons, it is said to be this. 2. A chemical reaction where one substance is oxidized and the other is reduced. 3. These are broken and formed in a chemical reaction. 5. Used to show the number of formula units in a chemical equation. 6. A reaction that can convert reactants to products or products to reactants. 7. A type of chemical reaction where compounds break down to form elements and simpler compounds. 9. A type of chemical reaction where the cation in one compound changes places with the cation in another compound. 13. A type of chemical reaction where elements combine to form a compound. 14. A change in which one or more substances are converted into new substances. 16. A substance that speeds up the rate of reaction without any change to itself. 18. The rate at which reactants change to products. 23. A reaction that occurs without the need for activation energy. 25. (l) in a chemical equation. 26. Substances created in a chemical reaction.