Unit 7 (set 2)

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Author:
jb124
ID:
287603
Filename:
Unit 7 (set 2)
Updated:
2014-10-30 17:43:51
Tags:
chemical reactions
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Description:
chemical reactions
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  1. signs of a chemical reaction
    • unexpected color change
    • unexpected temperature change
    • gas produced
    • formation of a precipitate
    • odor
  2. energy released in the form of heat (feels hot)
    exothermic reaction
  3. reaction in which energy is absorbed (turns cold)
    endothermic
  4. what is seen when gas is produced?
    bubbles
  5. what does the law of conservation of mass state?
    mass cannot be created or destroyed
  6. equations in conservation of mass serve as ___
    recipe
  7. parts of chemical reaction equation
    • reactant
    • product
    • subscript
    • coefficient
  8. what must you use to determine the number of atoms in an equation?
    • subscripts
    • coefficients
  9. to balance an equation, how many atoms on each side should there be?
    same number of atoms on reactant side must also be on the product side
  10. how do you make the number of atoms equal on both sides?
    place coefficient in front of whole compound or element being affected
  11. diatomic molecules
    • oxygen
    • hydrogen
    • fluorine
    • chlorine
    • nitrogen
    • bromine
    • iodine
  12. reaction in which 2 or more substances combine to form a single more complex substance
    synthesis reaction
  13. reaction in which a complex substance breaks down into 2 or more simpler substances
    decomposition reaction
  14. uncombined element replaces an element that is part of a compound
    single replacement
  15. different atoms in 2 different compounds replace each other
    double replacement
  16. what does a higher temperature do to the rate of reaction?
    more particle movement and more collisions
  17. what does a greater surface area do to affect the rate of reaction?
    gives more surface for the reaction to occur
  18. how does greater concentration of a solution affect the rate of reaction?
    more collisions occur with greater concentration
  19. substance that changes the rate of chemical reaction without being consumed
    catalyst
  20. how does a catalyst affect energy?
    lowers the amount of energy needed to start a reaction
  21. example of a catalyst
    catalytic converter enzymes
  22. balance equation:
    H2 + O2 --> H2O
    2 H2 + O2 --> 2 H2O

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