Across
- 5. reaction that absorbs more energy at the beginning of the reaction than is released
- 10. chemical reaction that absorbs heat
- 14. reaction that releases more energy during bond formation than the activation energy used to begin the reaction
- 16. reaction that occurs when a substance reacts with oxygen
- 18. change that occurs when a substance changes into an entirely different substance with unique properties
- 19. substances present before a chemical reaction and undergo chemical changes during a chemical reaction
Down
- 1. substance is broken down into two or more products
- 2. two or more substances combine to form a product
- 3. minimum amount of energy that is required to start a chemical reaction
- 4. chemical reactions that releases heat
- 6. process when one or more substances are transformed into different substances
- 7. change in a substances physical properties that does not change the type of matter in the substance
- 8. substance that increases the reaction rate without permanently changing
- 9. whole number written in front of a chemical formula in a chemical equation
- 11. new substance(s) formed following a chemical reaction
- 12. description using chemical symbols and formulas to show the reactants and products in a chemical reaction
- 13. measurement of the change in concentration of the reactants over a period of time
- 15. biological catalyst
- 17. substance that is used to slow down or stop a chemical reaction