8th grade chpt 4 Chemical Reactions

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Across
  1. 4. in this type of reaction, one complex compound will break down into simpler ones
  2. 6. ___ energy is the minimum amount of energy needed for a reaction to take place
  3. 7. this small number following an element’s symbol in a chemical equation tells you how many atoms of that element are present in the reaction
  4. 10. a chemical reaction occurs when existing chemical ___ are broken and new ones may be made
  5. 12. increasing this will cause particles to move faster and will increase the reaction rate, lowering it will decrease the rate
  6. 14. if chemical change ___, it may indicate a chemical reaction has taken place
  7. 15. this type of reaction takes simple things and combines them to make them more complex
  8. 16. a compound that prevents or slows down a chemical reaction
  9. 17. the Law of ___ __ ___ states matter cannot be created nor destroyed, only changed
  10. 18. crushing or breaking something up will increase the __ __ of the substance and allow more surfaces for the reaction to take place
  11. 20. type of reaction that absorbs energy as it happens
  12. 22. this number in front of a compound in a chemical equation tells you how many molecules of that compound there are
  13. 24. in this type of reaction, positive ions of both compound switch places
  14. 27. a chemical ___ shows the number of chemicals and how they react to form now substances
  15. 28. the arrow in a chemical equation means this word
  16. 29. these/this is any compound that is reacting, it is on the left side of the arrow in a chemical equation
  17. 30. in this type of reaction, one substance changes places with another
Down
  1. 1. these are catalysts in our body that speed up chemical reactions
  2. 2. a ___ change is one in which the appearance of the matter changes, it does not change what it is
  3. 3. a solid may form when 2 liquids react, it is called this, a ___
  4. 5. if this (tiny bubbles) are produced during a reaction, it may indicate a chemical reaction
  5. 8. you can put chemical inhibitors called ___ onto food to keep them from decaying
  6. 9. in this type of chemical reaction system, the environment can influence the reaction, or matter can enter and escape from the reaction
  7. 11. the amount of __ in a given volume is concentration
  8. 13. in this type of reaction system, the reaction is contained, matter cannot enter or exit
  9. 17. a ___ change occurs when a new substance is created
  10. 19. adding water or another solvent to a solution will ____ the mixture and could slow down the reaction
  11. 21. the things that are produced in a chemical reaction
  12. 23. type of reaction that gives off energy
  13. 25. all the atoms of each element reacting in a chemical equation must ___ the number of atoms that are being produced.
  14. 26. a compound that speeds up a chemical reaction without itself being consumed