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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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buddah buddah
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12 years ago
9. Of the balanced chemical equations below, which one is combustion reaction?

   A. 2CH4+4O2--->2CO2+4H2O
   B. CaO+H2O--->Ca(OH)2
   C. 2N2+3H2--->2NH3
   D. 2Mg+O2--->MgO


10. In the following chemical reation, what product is represented by X?
 
  AlCl3+NaOH--->X+NaCl

   A. AlOH
   B. Al(OH)3
   C. Al3OH
   D. It cannot be determined.
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12 years ago
Combustion reactions typically refer to those in which hydrocarbons are reacted with oxygen to release large amounts of heat and light.  Though the broad definition includes many reactions with oxygen, A is the best answer.

In number 10, the reaction is a double replacement.  Since sodium and chloride combined, the aluminum and hydroxide must also combine.  Because aluminum has a +3 charge and hydroxide has a -1 charge, and we must "criss cross" the charges, the final formula would be (B).
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