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Across 1. reaction that requires more energy to break bonds than is released after forming new bonds 4. the new substances produced from a reaction 5. speeds up a chemical reaction 11. chemical reactions that release energy 12. this is the number of units for each substance in a reaction 13. loss of electrons 14. reaction where a substance reacts with oxygen and produces energy in the form of heat and light 16. reaction where positive ion of one compound replaces positive ion of another to form 2 new compounds 17. describes a chemical reaction by using formulas and other symbols 18. reaction when a substance breaks down into two or more substances 19. reactions where energy is given off in the form of heat

Down 2. energy in the form of heat is needed for this type of reaction 3. gain of electrons 6. reaction where two or more substances combine to form another substance 7. the substances that react 8. reaction where one element replaces another element in a compound 9. change in which one or more substances are converted into new substances 10. insoluble compound that comes out of a solution during double-displacement reaction 15. slows down rate of chemical reaction