Science - Chapter 1

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Across
  1. 4. a material that increases the rate of a reaction by lowering the activation energy
  2. 6. the study of the properties of matter and how matter changes
  3. 9. a combination of symbols that represent the elements in a compound
  4. 12. a well-mixed mixture
  5. 13. type of chemical reaction where two or more substances (elements or compounds) combine to make a more complex substance
  6. 14. a reaction that absorbs energy in the form of heat
  7. 19. a particle made of two or more atoms bonded together
  8. 21. a number in front of a chemical formula that tells how many atoms or molecules of each reactant are present
  9. 22. type of chemical reaction where reactant(s) are broken down into simpler products
  10. 27. the amount of one material in a given volume of another material
  11. 28. a material that releases energy when it burns
  12. 31. a shorter, easier way to show chemical reactions using symbols instead of words
Down
  1. 1. fire requires fuel, oxygen, and _____.
  2. 2. the materials you have after a chemical reaction has occurred
  3. 3. a solid that forms from solution during a chemical reaction
  4. 5. numbers that show the number of atoms of an element in a molecule or the ratio of elements in a compound
  5. 7. a reaction that releases energy in the form of heat
  6. 8. a substance that cannot be broken down into any other substances by chemical or physical means
  7. 10. biological catalysts that provide a surface on which reactions take place
  8. 11. _______ of mass - matter cannot be created or destroyed. Total mass of the reactants must equal the total mass of the products
  9. 15. a change that alters the form or appears of a material but does not convert the material into new substances
  10. 16. (in chemistry) one or two letter set of characters used to identify an element
  11. 17. a material that decreases the rate of a reaction
  12. 18. the minimum amount of energy needed to start a chemical reaction
  13. 20. type of chemical reaction where one element replaces another in a compound or two elements in different compounds trade places
  14. 23. a change in matter that forms one or more new substances
  15. 24. substance made of two or more elements chemically combined in a specific ratio
  16. 25. the materials you have at the beginning of a chemical reaction
  17. 26. a rapid reaction between oxygen and a fuel - results in fire.
  18. 29. anything that has mass and takes up space
  19. 30. two or more pure substances (elements, compounds, or both) that are in the same place but are not chemically combined