Victor Grade 7 - Science - Chemical Reactions

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Costi
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258100
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Victor Grade 7 - Science - Chemical Reactions
Updated:
2014-01-23 18:46:09
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Chemical Reactions
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Chemical Reactions
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  1. What is chemical bonding?
    Chemical bonding is the combining of elements to form new substances.
  2. What is the maximum number of electrons in the Second Energy Level?
    The maximum number of electrons in the Second Energy Level is eight.
  3. What are electrons in the outermost energy level called?
    Electrons in the outermost energy level are called valence electrons.
  4. Why do elements bond?
    Elements bond in order to complete outermost energy levels.
  5. What are the substances to the left of the arrow in a chemical reaction called?
    The substances to the left of the arrow in a chemical reaction are called…. reactants.
  6. What is an atom's ability to undergo chemical reactions determined by?
    An atom's ability to undergo chemical reactions is determined by its outermost electrons.
  7. Why do you have to balance a chemical equation?
    Due to the law of conservation of massyou have to balance a chemical equation.
  8. Two or more simple substances combine to form a new substance in a ______________?
    Two or more simple substances combine to form a new substance in a Synthesis Reaction.
  9. A reaction in which energy is absorbed is called ______________.
    A reaction in which energy is absorbed is called endothermic.
  10. In a exothermic reaction, heat is……..
    In an exothermic reaction, heat is released.
  11. The rate of a chemical reaction can be increased by doing what?
    The rate of a chemical reaction can be increased by increasing surface area.
  12. What sign means "yields" in a chemical reaction?
    An arrow symbol ___________> means "yields" in a chemical reaction.
  13. An uncombined element replaces another element that is part of a compound is called ________________?
    An uncombined element replaces another element that is part of a compound is called a single replacement reaction.
  14. A __________ enters a chemical reaction and a ___________ is formed.
    A reactant enters a chemical reaction and a product is formed.
  15. Which of the following is NOT a type of chemical reaction?

    a. synthesis
    b. decompositoin
    c. compostion
    d. single replacement
    Composition is NOT a type of chemical reaction.
  16. What does the law of conservation state?
    The law of conservation states…..

    that energy can not be created or destroyed in a chemical reaction.
  17. Which of the following supports the law of conservation of mass….

    a. H2  +  O2  __________>  H2O

    b. Zn  +  HCI  __________>  2ZnCl2

    c.  2Mg  +  O2   __________2MgO

    d.  2NaOH  __________> Na2  +  O2  +  H
    c.  2Mg  +  O2   __________> 2MgO 

    Supports the law of conservation of mass.
  18. Which of the following is a synthesis reaction?

    a.  2H2  +  O2  ___________>  2H2O

    b.  Zn  +  2HCI  ___________>  ZnCl2 + H2

    c.  2 NaOH  ____________> 2 Na  +  02  + H2

    d.  2H20  ___________>  2H2  + O2




    a.  2H2  +  O2  ___________>  2H2O

    is a Synthesis Reaction.
  19. In the chemical formula 6H2SO4 the 6 is a _______________ and the 4 is a _____________?
    In the chemical formula 6H2SO4 the 6 is a coefficient and the 4 is a subscript.
  20. Use the reactions below to answer the questions that follow.  There may be more than one answer to the questions below.

    a.  H2 + O2 ___>  H2O

    b.  NaCl  ____>  Na  + Cl2 

    c.  Zn + HCI  ____>  ZnCl2  +  H2

    d.  MgO  ____> Mg  + O2

    e.  H2O + Fe  ____>  Fe2O3 + H2

    f.  KCI  +  Pb(NO3)2  ______> K(NO3)  +  PbCl2
    Which of the above reactions are synthesis reactions?   a

    Which of the above reactions are single replacement reactions?  c and e

    Which of the above reactions are double replacement reactions?    f

    Which of the above reactions are decomposition reactions?  b and d

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