Chapter 2 terms

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Across
  1. 1. a solid that forms from a solution during a chemical reaction
  2. 6. a rapid reaction between oxygen and fuel that results in fire
  3. 8. the principle stating that matter is not created or destroyed during a chemical reaction
  4. 9. a system in which matter can enter from or escape to the surroundings
  5. 10. a number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
  6. 11. the study of the properties of matter and how matter changes
  7. 13. a reaction in which one element replaces another in a compound or when two elements in different compounds trade places
  8. 14. a characteristic of a substance that can be observed without changing the substance into another substance
  9. 18. a biological catalyst that lowers the activation energy of reactions in cells
  10. 22. the process in which substances undergo chemical changes that result in the formation of new substances
  11. 23. the amount of one material in a certain volume of another material
  12. 24. a reaction that releases energy in the form of heat
  13. 25. anything that has mass and occupies space
  14. 26. a material that releases energy when it burns
Down
  1. 2. a material that decreases the rate of a reaction
  2. 3. a system in which no matter is allowed to enter or leave
  3. 4. a chemical reaction that breaks down compounds into simpler products
  4. 5. a short and easy way to show a chemical reaction using symbols
  5. 7. the minimum amount of energy needed to get a
  6. 12. a reaction that absorbs energy in the form of heat
  7. 15. a substance formed as a result of a chemical reaction
  8. 16. a change that alters the form or appearance of a material but does not make the material into another substance
  9. 17. a material that increases the rate of a reaction by lowering the activation energy
  10. 19. a characteristic of a substance describes its ability to change into different substances
  11. 20. a chemical reaction in which two or more simple substances combine to form a new more complex substance
  12. 21. a substance that enters into a chemical reaction
  13. 22. reaction started