SCIENCE

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Across
  1. 7. The reaction where heat is absorbed. (10)
  2. 9. A substance made of two or more chemically bonded elements. (8)
  3. 12. A compound that fizzes upon contact with blood. (16)
  4. 14. The type of reaction that releases energy, often as heat. (12)
  5. 15. When a liquid turns into gas, like water drying. (10)
  6. 16. The change when ice turns into water. (9)
  7. 17. The process of iron reacting with oxygen to form rust. (8)
  8. 22. The loss of electrons in a reaction. (9)
  9. 23. The basic unit of matter. (5)
  10. 24. Tiny bubbles formed in reactions like hydrogen peroxide with blood. (4)
  11. 27. The states of matter: solid, liquid, or gas. (5)
  12. 28. The term for a solid forming from a solution. (9)
Down
  1. 1. The process of absorbing water in a reaction. (9)
  2. 2. A metal that oxidizes to form rust. (4)
  3. 3. table A chart that organizes elements by properties. (13)
  4. 4. A change that alters the molecular structure of a substance. (14)
  5. 5. form when this reacts with blood. (7)
  6. 6. A change that does not alter chemical composition. (14)
  7. 8. The process of metal breaking down due to oxidation. (9)
  8. 10. The gas essential for oxidation and combustion. (6)
  9. 11. phase change where a solid turns into a liquid. (7)
  10. 13. The smallest unit of chemical compounds. (9)
  11. 18. A reaction where one substance breaks into two or more. (12)
  12. 19. The layer of gases surrounding Earth. (3)
  13. 20. A force that holds atoms together in molecules. (4)
  14. 21. A form of energy that can start chemical changes. (4)
  15. 24. A substance that undergoes a chemical change when burned. (5)
  16. 25. A substance used to neutralize stomach acid. (7)
  17. 26. The energy required to break chemical bonds. (6)
  18. 29. The process where metals lose their luster due to oxidation. (10)