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Across 3. a reaction that releases energy to the surroundings. 4. the balance point where the concentration of reactants and products are the same during a reaction. 9. an atom with unpaired electrons. 12. reactions in which elements trade places to form new compounds. 16. the process that changes compounds of substances into new substances. 17. a reaction where one reactant is oxygen gas and at least one product contains oxygen atoms.

Down 1. a symbolic representation of a chemical reaction that shows the relationship between reactants and products. 2. a biological catalyst. 5. a substance that is present before a chemical reaction. 6. the energy stored in chemical bonds and released as atoms in compounds rearrange to form new substances. 7. a reaction that absorbs energy from the surroundings. 8. a substance that is made by a chemical reaction. 10. a reaction that takes 1 compound and breaks it into 2 or more new substances. 11. a reaction that takes 2 or more substances and combines them into 1 new compound. 13. the reactant that an enzyme acts on. 14. the proportion of reactants to products in a chemical reaction and shown by the coefficients of a chemical reaction. 15. anything that changes the speed of a reaction without itself being changed.